- What you should know
- A major snowstorm is expected to hit Philadelphia and the region this weekend. It could be the city’s first double-digit snowfall in 10 years, though the latest forecast has snow totals down slightly.
- Here are maps with the latest snowfall and ice forecasts.
- Philadelphia officials declared a snow emergency, beginning Saturday night. City schools will be closed Monday, and trash collection will be suspended and delayed.
- You can be fined up to $300 for not shoveling your sidewalk in Philly. Here are the rules.
- Here are the top 10 snowstorms in Philadelphia history.
// Timestamp 01/23/26 6:59pm
Heavy snow and potentially dangerous icing are expected in Philly this weekend
Philadelphia could experience more snow this weekend than it did during the the entire winter of 2024-25, but the forecast updates Friday suggested that may not be the worst of the storm’s offerings.
In issuing a profoundly predictable winter storm warning, in effect from 7 p.m. Saturday until 1 p.m. Monday, the National Weather Service said that in addition to 8 to 12 inches of snow, as much as a quarter-inch of freezing rain could accumulate. That would greatly increase the power outage potential.
Whatever the outcome, the storm still in its formative stage already has had significant impacts on the region and may have set an unofficial record for pre-storm buildup and preemptive closings.
Philadelphia Mayor Cherelle L. Parker declared a state of emergency for Sunday, as did Pennsylvania Gov. Josh Shapiro and New Jersey Gov. Mikie Sherrill. PennDot is imposing speed restrictions. SEPTA is expecting issues.
Some schools already were planning for multiple-day closings, as the snow and ice will be accompanied by one of the region’s more impressive cold snaps of the last several years.
Were it not for the storm, in fact, the cold might be getting headlines.
Wind chills Saturday morning are expected to drop below zero. Sunday’s high of 25 degrees may make it the warmest day of the week.
It is likely that layers of snow and ice will harden into a frozen mass that the January sun won’t be able to do a whole lot about.
As a public service, for now we will hold off on mentioning another potential storm threat.
// Timestamp 01/23/26 4:32pm
Pennsylvania Gov. Josh Shapiro signs disaster emergency declaration ahead of storm
Gov. Josh Shapiro on Friday signed a disaster emergency declaration for Pennsylvania, freeing up resources for preparation and support efforts ahead of the coming weekend winter storm.
“Today, I signed a disaster declaration for the entire Commonwealth to ensure our agencies have all necessary resources ready to go,” Shapiro said in a statement. “Stay off the roads if you can, be safe, and follow instructions from PEMA and your local authorities.”
The declaration, Shapiro’s office said, more easily allows the state to use funding to give various state agencies the resources required to more effectively respond to the storm and county and municipality level. Much of the state is expected to experience significant snowfall as part of the storm, with forecasters calling for 8 to 12 inches of snow for the Philadelphia region, as well as ice totals of 0.25 inches.
In addition to announcing the disaster emergency declaration, Shapiro’s office urged Pennsylvanians to stay off the roads during the storm if possible.
Locally, Delaware County also declared a disaster emergency that will run for seven days starting Friday, county officials said. The storm, the county said in a statement, could cause “injury, damage, and suffering” to Delco residents, prompting the declaration.
“Please avoid unnecessary travel, particularly during the peak of the storm and ensure that you have enough essentials to last several days in case travel becomes difficult,” said Delaware County Council Chair Richard Womack.
// Timestamp 01/23/26 4:19pm
New Jersey Gov. Mikie Sherrill declares state of emergency
New Jersey Gov. Mikie Sherrill has declared a state of emergency in the state ahead of the impending weekend winter storm, and issued statewide commercial vehicle restrictions on interstate highways.
“It’s been a while since we have seen a storm like this,” Sherrill said at a Friday news conference. “We’re tough, but we need to be prepared. We have to be safe.”
Sherrill, who was inaugurated earlier this week as New Jersey’s 57th governor, also urged residents to stay indoors throughout the duration of the storm, and refrain from traveling unless absolutely necessary. Potential road conditions for early Monday, she added, remained in flux, as the state could possibly “still be digging out” from the storm.
“Don’t commit to anything Monday morning,” Sherrill said.
Sherrill noted that while forecasts have been somewhat fluid, it appeared at the time of her briefing Friday that North Jersey was likely to see higher snow totals of 12 to 18 inches, while South Jersey could see 12 inches or less. The whole state, however, is expected to see impacts from snow and ice.
As part of Sherrill’s declaration, the State Emergency Operation Center will activate at 6 p.m. Saturday, officials said. Activating the center will allow state leaders to coordinate county and state responses to the storm, and monitor assistance requests around New Jersey.
“This is a good weekend to stay and watch some football, play a board game with your kids, but please stay off the roads on Sunday,” Sherrill said.
// Timestamp 01/23/26 4:04pm
SEPTA expects service interruptions during storm Sunday: ‘Bad day to travel’
SEPTA officials gathered at their West Philadelphia depot Friday to unveil plans for this weekend’s winter storm, and demonstrate the machinery they have to battle the snow and ice.
Up to 70% of SEPTA’s workforce will be working Saturday and Sunday to clear travel lanes, keep trains and buses moving, and respond to emergencies. That said, SEPTA expects interruptions to its transit system as there is a lot of work ahead, said SEPTA General Manager Scott A. Sauer.
Crews will utilize large blowers, snow throwers, augers, and other pieces of heavy equipment to clear tracks and other critical areas, as well as 6,000 tons of salt to spread at stations and other facilities. SEPTA has 300 parking lots across their five-county service region as well as platforms and customer service areas.
“Extreme weather like this is very hard on our vehicles. As you know, we have the oldest rail fleet in the country. It’s hard on the trains as well as our tracks and other infrastructure,” Sauer said. “I fully expect we will see some equipment problems and need to make emergency repairs, but I am confident that our work crews are ready to handle any issues that come up.”
Blocked rail lines, power interruptions, residential cars blocking travel lanes, and more all contribute to service disruptions, Sauer said. SEPTA stresses that Sunday will be a “bad day to travel,” and to stay home unless it is absolutely necessary.
According to SEPTA, even if snowfall ends on Sunday, don’t expect the transit system to be back to normal by Monday morning.
Stay up to date on SEPTA alerts at septa.org or on the SEPTA mobile phone app.
// Timestamp 01/23/26 3:27pm
More flight cancellations expected at PHL
A “handful of flights” at Philadelphia International Airport had been cancelled as of Friday afternoon for Saturday and Sunday as the city expected a weekend snowstorm. More cancellations were likely ahead of the start of the storm, said airport spokesperson Heather Redfern via email.
“This is an all-hands-on-deck situation for the Department of Aviation’s team, and our operations team will be working throughout the weekend to ensure the safe operation of runways, taxiways, roadways and terminals,” she said.
In preparation for the storm, the department’s crews are getting equipment ready to keep runways, taxiways, airport roadways, and sidewalks clear, she said. Deicing airplanes is handled by the airlines.
The airport does not close, she noted, even if flights are canceled by airlines or in the event that the Federation Aviation Administration issues a ground stop.
Travelers who have flights booked for the coming days through the airport should check in with their airlines, the airport advises, to see if their flight has been canceled or if they can reschedule it.
“PHL’s top priority is ensuring the safety of the traveling public and our staff as we work to ensure ongoing operations,” said Redfern.
// Timestamp 01/23/26 3:25pm
PennDot says it’s equipped to handle ‘bear’ of a storm
Local PennDot officials said the department’s Philadelphia-area operations are well positioned to deal with the impending winter storm’s impacts, but urged residents to avoid being out and about if possible.
“This storm should be treated by travelers as a potentially serious weather event, and we hope everyone will make the accommodations to avoid travel if possible during this winter storm,” deputy communications director Brad Rudolph at a Friday news conference.
The department has already activated its anti-icing efforts, sending crews out to spray a salt brine mixture on expressways and major roadways to limit or prevent ice accumulation, officials said. In addition, it has access to about 425 trucks for snow clearing work, and has amassed about 70,000 tons of salt for its regional stockpile, Rudolph said.
Though salt is plentiful, officials noted, it is likely to be less effective than usual during this storm because of the low temperatures that are anticipated. Salt is more effective at preventing or melting ice when temperatures are above 20 degrees, and that level of warmth is likely to be in short supply during the storm and in the days after.
“One pound of salt will melt about 46 pounds of ice and snow at 30 degrees,” said PennDot senior district executive for maintenance Tom Rogal. “At 10, 15 degrees, it’s about one pound [of salt] to five pounds [of ice and snow]. So, you can only imagine how much more salt we would have to use.”
Plowing operations are slated to begin once snow begins to fall, and roadways are to be treated throughout the storm until the precipitation moves out and roads are cleared. PennDot, Rogal added, has also brought in additional resources to deal with the storm’s impacts, including more machines used for clearing snow and ice.
Despite the potentially serious impacts of the storm, Rogal said he remained confident PennDot was prepared.
“It’s a bear, but we’re equipped for it,” he said. “We can handle the situation. We’ve done this. Our operators are well-trained, and they take their job very seriously.”
// Timestamp 01/23/26 2:46pm
Delaware doesn’t want people sledding down sand dunes
Delaware beaches may not face as much snow as points north this weekend, but the National Weather Service still expects up to 6 inches of snow, and “very cold, windy conditions” will lash the working, vacation, and retirement communities — and the extensive sand dunes that bracket the area at Cape Henlopen and Delaware Seashore state parks.
But if that’s the kind of weather warning that gets your winter-sports hopes up, think again. “Do Not Sled or Snowboard on Dunes,” which “contain fragile wildlife habitat and provide protection for the beaches” and nearby neighborhoods, warns the state Department of Natural Resources and Environmental Control. Indeed, even walking across the shore dunes is prohibited at those parks, except at marked trails and crossings.
In the warning post, Delaware pointed sledders to a list of alternate sites where downhill runs are encouraged. Unfortunately for beach residents and visitors, almost all the officially approved sledding hills in this low-lying state are nearly two hours north, rimming the Brandywine and other streams that flow south from Pennsylvania. At least in the Diamond State, beach snow sports aren’t a thing.
// Timestamp 01/23/26 2:32pm
Winter storm warning up, snow totals down slightly
The National Weather Service has added the entire region to a winter-storm warning that now covers about half the country.
While the agency has trimmed back the snow amounts for Philly, it has added more ice, said Nick Guzzo, meteorologist in the Mount Holly office.
The weather service now is calling for 8 to 12 inches of snow for Philadelphia, but has increased ice totals to 0.25 inches as more freezing now is expected.
Sleet, which counts toward snow totals, and freezing rain are to do mix in Sunday afternoon after several inches of snow have accumulated.
The snow is expected to start in the early-morning hours, and precipitation could flip back to snow early Monday.
The winter storm warning goes into effect at 7 p.m. Saturday and continues through Monday morning.
Whatever falls is likely to stay around for awhile as the coldest weather of the season, perhaps in the last several years, settles over the region.
// Timestamp 01/23/26 2:14pm
Philly courts will be closed Monday
Philadelphia’s court system will be largely closed Monday due to the impending winter storm, meaning all scheduled trials and other hearings will be rescheduled for other dates.
Emergency services will remain open, the courts said on social media, including arraignment court. And people will still be ale to file emergency protection from abuse petitions at the Stout Center for Criminal Justice.
// Timestamp 01/23/26 1:47pm
Vehicle restrictions on Pa. highways will be in effect Sunday
Starting at midnight on Sunday, the Pennsylvania Department of Transportation will implement vehicle restrictions aimed at limiting the number of cars on roads statewide during the coming winter storm.
PennDot’s vehicle restrictions are instituted in a tiered system, with Sunday’s coming in at tier four — the second-highest level. Under that tier, commercial vehicles are totally prohibited from using a number of interstates around Pennsylvania, as well as the Pennsylvania Turnpike.
“The decision to implement these restrictions was made with the intention of balancing safety for everyone on the roadway, including commercial drivers,” said PennDot secretary Mike Carroll. “We will remove these restrictions as soon as conditions warrant.”
In addition to limiting the travel of vehicles like tractor trailers and commercial buses, PennDot’s restrictions also apply to school buses, motorcycles, RVs, and passenger vehicles that are towing trailers, Carroll added. None of those vehicles, he said, are permitted to use roadways while the restrictions are in place.
“These restrictions aren’t about the quality of the driver,” said Pennsylvania Turnpike CEO Mark Compton. “These restrictions are about the amount of time it takes for us to clear an incident on one of these roadways. We ask that you please adhere to these restrictions.”
Officials urged motorists to stay home amid the coming storm, noting that the anticipated snowfall rate of one to two inches per hour, as well as the overall snowfall totals, will make keeping roads safe and clear difficult.
Restrictions, PennDot notes online, are evaluated hourly. Pennsylvania’s traveler information website, 511PA, keeps an up to date map of which roads are impacted by the restrictions, and Carroll recommended travelers check that website before heading out, should they absolutely have to.
“Stay home and watch the NFL games, despite the fact that the Eagles and Steelers are not playing,” Carroll said.
// Timestamp 01/23/26 1:40pm
Schedule change for two Philly basketball games due to snowstorm
With heavy snowfall expected this weekend, two Big 5 basketball programs are moving their tipoff times.
The St. Joseph’s men’s team was slated to take on Davidson at 6 p.m. on Saturday at Hagan Arena. Now, the Hawks will be starting at 2 p.m. to avoid interference with potential snowfall on Saturday night.
Meanwhile, Drexel women moved its Sunday matchup against Towson at the Daskalakis Athletic Center to Saturday at 6 p.m., which will now be a homecoming doubleheader with the men’s team, which face Northeastern at 2 p.m.
The women’s team will play back-to-back days, as the Dragons host Stony Brook on Friday night (6 p.m.).
— Conor Smith
// Timestamp 01/23/26 1:18pm
Archdiocesan schools will use a flexible instruction day Monday
All archdiocesan schools in Philadelphia, and all Archdiocese of Philadelphia high schools, including those in suburban counties, will use a flexible instruction day Monday.
The decision came because of the “severely inclement” weather that already caused the Philadelphia School District to call for a day off Monday.
Archdiocesan elementary schools in the suburbs typically follow the snow closing decisions of their local school districts, but officials urged parents and students to check with their local school administration for information about Monday.
// Timestamp 01/23/26 1:07pm
Cold facts about sleet and freezing rain
Neither sleet nor freezing rain are particularly pleasant forms of precipitation, but in terms of their impacts, they can be very different.
Sleet forms when a partially melted snowflake or rain drop freezes on the way to the ground.. Freezing rain is rain that doesn’t turn to ice until it lands on a surface and freezes on contact.
During a winter storm, both hold down accumulations. Typically, an inch of liquid precipitation can yield a foot of snow. A similar amount of liquid would yield about 4 inches of sleet. Freezing rain, of course, is measured as pure liquid. A quarter-inch is enough to trigger a winter-storm warning.
Both can fall when surface temperatures are well below freezing, if the upper air is warm enough.
Sleet has an endearing quality for the power companies and their customers: It bounces, rather than glooming on to wires.
Freezing rain is a menace to wires and adds weight to snow on tree branches.
In 2014, freezing rain that began 18 hours after a heavy snowfall resulted in Peco’s biggest winter outage total on record, affecting more than 700,000 customers.
In a battle between sleet and freezing rain, you probably should root against the latter.
// Timestamp 01/23/26 12:18pm
What’s with the weather and the weekends?
Assuming that a 100% chance of snow, and everything else, from the winter menu assures that something actually will happen, this would mark the third consecutive weekend with notable precipitation in the region.
Nearly an inch of rain was measured in Philly on Jan. 10, and last Saturday and Sunday several inches of snow accumulated in areas away from the city heat island in separate snow events.
It’s not like the atmosphere particularly cares about our weekend plans.
It is not uncommon for snow and rain to show up on the same days of the week over periods of several weeks.
That’s the result of the typical spacing between weather systems as they move across the country, meteorologists say.
Sometimes, that keeps happening in 3- to 3½-day intervals — until it doesn’t.
But not to get too far ahead of ourselves, another threat may be brewing for next weekend.
// Timestamp 01/23/26 12:08pm
SEPTA expects service issues due to snowstorm
Philadelphians can expect SEPTA service disruptions as a result of the storm.
“Significant accumulations of snow and ice are likely to create unsafe conditions, both on the roads and the rails, and we’ll be making adjustments,” said SEPTA General Manager Scott Sauer.
“Customers should expect impacts to bus, trolley, and regional rail service.”
Sauer said SEPTA lines will operate for as long as it’s safe to do so and it will try to announce any service shutdowns two hours in advance when possible.
For essential workers who are required to commute Sunday, Sauer said the Broad Street Line and Market Frankford Line are the most reliable. Those lines are easier to keep open because large chunks of the rail are underground and the elevated tracks can be kept clear with frequent service, he said.
While inconvenient, suspending service before the height of the storm will ensure no one is stranded and no equipment is damaged, said Sauer.
Sauer warned it may take a few days to get service back to normal and reminded people to avoid travel unless absolutely necessary during the height of the storm.
// Timestamp 01/23/26 11:59am
Philly residents can be fined for not shoveling snow
More than 1000 workers are helping treat the streets and roads of Philadelphia, said Director of the Office of Clean and Green Carlton Williams.
Williams said workers are scheduled to work around the clock with 600 pieces of equipment and 30,000 tons of salt at the ready to make roads passable.
But he reiterated that residents bear some responsibility as well, reminding people that tickets will be issued for untreated sidewalks. They’ll have six hours to shovel after the storm and failing to do so could lead up to a $300 fine.
“We expect our residents to be out there, because, again, this is a safety issue,” said Williams. “If that becomes frozen or we can’t get access to someone because sidewalks aren’t shoveled that’s a problem for our emergency responders.”
// Timestamp 01/23/26 11:20am
City warming centers to remain open during snowstorm
Crystal Yates-Galle, Deputy Managing Director for Health and Human Services, said the city’s warming centers will continue to remain open during this storm as part of the ongoing Code Blue declaration, which allows the city to also add shelter beds to the system.
Warming centers are located at select libraries during the daytime from 9 a.m. to 9 p.m.
From 9 p.m. to 9 a.m., select recreation centers will act as warming centers.
The need is already proving to be great. The city reached capacity at four of its five warming centers Thursday, Yates-Gale said, but plans to open more as needed.
Shelter beds are also at capacity, though the city plans to add another 150 beds throughout the system within the next two weeks.
Philadelphia Police Commissioner Kevin J. Bethel said his department would be working with outreach workers to connect homeless people to city services during the snow emergency.
The city has an interactive map of warming centers here.
Yates-Gale said people in need of services should go to their local police precint to be transported to the nearest warming center.
// Timestamp 01/23/26 11:08am
Philly schools will be closed Monday
Philadelphia schools will be closed Monday, Superintendent Tony Watlington Sr. announced at a new conference Friday.
Monday will be a full snow day, but if schools need to remain closed Tuesday and beyond, students have Chromebooks and will turn to remote learning until it’s safe to return.
“We’re inviting students and staff to enjoy this snowfall, which will be the most I’ve seen during my nearly four years here in Philadelphia,” Watlington said.
// Timestamp 01/23/26 11:02am
‘Your cars will be towed’: City officials warn residents about snow parking
Regardless of how much snow Philly gets, the roads are a major concern for city officials.
Illegal parking, especially on narrow residential streets, is a focus for officials.
The city has been treating roads since Wednesday, according to Carlton Williams, director of the Office of Clean and Green.
But in order for plow operations to flow smoothly, Williams said residents would need to avoid parking in front of fire hydrants and blocking corners.
“Do not park on designated snow emergency routes,” said Williams.
“Your cars will be towed, snow emergency routes are necessary for our emergency responders to get to a location as quickly as possible and park cars impede that process.”
To help clear those emergency routes, the Philadelphia Parking Authority will institute $5 flat rate parking beginning at 7 p.m. on Saturday at any of its lots.
// Timestamp 01/23/26 10:56am
Philly trash and recycling collection suspended Monday, delayed rest of the week
Trash and recycling collection will be suspended across Philadelphia Monday, the city announced in a news conference Friday.
Collection days for the rest of the week will be pushed back a day, and residents are asked to hold their trash and recycling until the next day.
“There will be no two-day-a-week trash collection in those neighborhoods who receive that service.” said Carlton Williams, director of the Office of Clean and Green Initiatives.
Due to the amount of snow forecast, Williams asked residents with driveway collection to bring trash out to the street or use the drop off center, due to plowing issues.
// Timestamp 01/23/26 10:45am
Parker declares snow emergency in Philly beginning Saturday night
With more than a foot of snow possible this weekend, Philadelphia Mayor Cherelle L. Parker announced a snow emergency would go into effect Saturday at 9 p.m.
“We hope you will help us by keeping our roadways as free as possible of any vehicles that don’t necessarily need to be parked there,” Parker said at a news conference Friday, warning roads would be “hazardous” Sunday.
“Please take this storm seriously,” Parker said. “Limit unnecessary travel once conditions worsen, and if you must be out, give yourself extra time, drive slowly and stay off the roads if conditions become hazardous, so our crews and first responders can do their jobs safely.”
Crews have already begin brining city streets, and while the focus will be on the city’s major roadways, Parker pledged to also get to residential streets as soon as possible.
“We will make every effort to get to every primary, secondary and tertiary street in the city of Philadelphia,” Parker said. “That is our standard.”
// Timestamp 01/23/26 9:34am
More than a foot of snow is expected in Philly
Love it or hate it, more snow than Philly has seen in a long time is all but certain this weekend.
Forecasters continue to predict as much as 18 inches of snow could fall in and around Philadelphia beginning Saturday night, which would mark the city’s first double-digit snowfall in a decade, almost to the day.
The situation is so serious, former NBC10 meteorologist Glenn “Hurricane” Schwartz has come out of retirement and is doing forecasts on TikTok.
“It’s going to be a historic storm,” Schwartz predicted Thursday night.
At this point, the only thing that might keep down the snow totals is a wintry mix of sleet and freezing rain, which could fall during peak portions of the storm Sunday. Even so, precipitation is expected to shift fully back to all snow by Sunday night, with an additional inch or two likely before the storm moves through.
When it’s all said and done, forecasters predict about 13 inches of snow will have fallen in Philadelphia.
Officially, a winter storm watch is in effect for the region beginning 7 p.m. Saturday through 1 p.m. Monday. With temperatures expected to plummet Friday night (along with wind chills between -10° and 0°), a cold weather advisory is also in effect through Saturday morning.
// Timestamp 01/23/26 9:17am
Philly-area schools prepare for closures that could last multiple days
Ahead of the impending snowstorm, some Philadelphia area school districts are sharing plans for closures — maybe for multiple days.
In Upper Darby, school officials told families Thursday night to prepare for the prospect of virtual instruction Monday, and possibly Tuesday.
“If the weather is more significant than anticipated and there are power outages in the area, we will shift to a snow day,” with no virtual school, Superintendent Daniel McGarry said in the message.
In the Cheltenham School District, Superintendent Brian Scriven told families that “if weather conditions require us to close schools and offices,” the district will have a traditional snow day Monday. Tuesday is to be determined – and Wednesday could be virtual instruction, “If conditions are significant enough,” Scriven said.
In the wake of the pandemic, area schools have taken different approaches on whether to have traditional snow days or online learning.
// Timestamp 01/23/26 7:57am
Maps: How much snow and sleet could fall across the Philly region
Official National Weather Service forecasts say 12 to 18 inches of snow is possible across most of New Jersey and Pennsylvania, including Philadelphia as the storm pushes through the region Saturday night to early Monday morning. More than 21 states were expected to experience at least moderate impacts from the storm, the weather service said.
The National Weather Service puts out forecasts for every few square miles of land in the United States four times a day through a system called the National Digital Forecast Database.
The map below displays that data. Use it to find how much snow is expected anywhere in the eastern United States. It will always show the most recent forecast for the next three days.
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// Timestamp 01/23/26 7:16am
What time will the snow in Philly start and end?
The timing and duration of precipitation aren’t among the strong suits of computer models.
The weather service’s winter storm watch, which covers the entire region, all of Delaware, and most of Pennsylvania and New Jersey, is in effect from 7 p.m. Saturday until 1 p.m. Monday.
The daytime Saturday “looks fine if you have to get out,” said Tom Kines, senior meteorologist with AccuWeather Inc.
The weather service is listing the likeliest starting time as the early morning hours of Sunday, with snow likely into the early morning hours of Monday.
Sunday is going to be one of the colder days of the winter with temperatures in the teens and lower 20s. The weather service introduces the possibility of freezing rain and sleet by 1 p.m., with a forecast temperature of 19 degrees.
// Timestamp 01/23/26 7:15am
Wintry mix could limit snow totals. It’s a real Philadelphia tradition.
One thing arguing against mega-snow totals this weekend along I-95 and South Jersey is the likelihood sleet and freezing rain would mix with the snow at the height of the storm’s impacts.
That’s part of the cost of doing business in Philly winters.
Our biggest snows typically come from coastal nor’easters, so-named for their onshore winds the import warm air off the Atlantic to the upper atmosphere, the sources of precipitation. Sea-surface temperatures off Atlantic City are in the upper 30s.
The warmth above changes the snow to rain that freezes on contact when it reaches a cold surface, a sidewalk, or street, or windshield. Or precipitation becomes sleet, liquid that becomes a ball of ice before it reaches the surface.
Storms that are purely snow are the exception in the Philly area, says Ray Kruzdlo, the hydrologist at the National Weather Service Office in Mount Holly.
One of American history’s most famous wintry mixes accompanied the Continental Army’s surprise invasion of the Hessians in Trenton in 1776 during the American Revolution. After crossing the Delaware on Christmas night, diary accounts tell of Gen. George Washington led his troops through a nasty wintry mix.
Conversely, Thomas Jefferson, 150 miles from the ocean in western Virginia, measured more than 20 inches of snow.
// Timestamp 01/23/26 7:14am
What are chances this snow storm is a bust?
In the chess matches between science and the nonlinear chaos of the atmosphere, chaos has been known to win.
One of the more notable busts occurred in January 2015 when forecasts called for an I-95 East Coast snowstorm so ferocious that the mayor of New York imposed a curfew.
Philly was supposed to get a foot or more, and ended up with an inch or two. That prompted the head of the Mount Holly weather service office to issue a public apology.
His boss at the time, weather service head Louis Uccellini, said no apology was necessary: Science has its limits. Busts have been known to happen in the battle of science against nonlinear.
This time around, meteorologists are all but certain something “impactful” is going to happen.
Ray Kruzdlo, the staff hydrologist in the weather service office, said the slim chance of this storm “not being significant is leaving us.”
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