UPDATE as of 3:55 p.m. Thursday...

Our sloppy, icy weather is just a few hours away from arriving in the Garden State. So here are some last-minute thoughts. (In addition to my full forecast and analysis below.)

—Thursday's daytime "appetizer" showers behaved as expected - spotty and light. You won't have any issues driving home Thursday night.

—The only change I would make to my AM forecast is a more compressed timeline. Radar will start to fill in around 9 p.m. Thursday evening (give or take). Brunt of the storm starts around 1 a.m. Friday morning. Things should largely wrap up by late morning Friday.

—The Winter Weather Advisory is perfectly placed. Mercer and Middlesex counties on north, you may find slippery spots tomorrow morning. South of that, it could get icy for a brief time overnight, but it'll flip to all rain well before the AM commute.

—The most uncertain piece of the forecast is the snow zone in far northern New Jersey. I went with 2-4+", but several models have backed off the snow potential completely. (Half-expected.) If it's all (or mostly) sleet, you ain't getting 4". But higher snowfall will be just over the border in NY.

—For school closings/delay decisions and your ride to work Friday morning, this is absolutely a "wait and see" storm. Set your alarm clock a few minutes early, and then poke your head outside to see if it's icy or just wet. (And turn on your radio for the latest statewide info!) Road conditions may vary based on exact location. And whether it's 31, 32, or 33 degrees.

—It's not a major winter storm. It's not a "snow" storm for the vast majority of New Jersey. Stay "weather aware" Thursday night and Friday morning, and watch for slippery spots.


ORIGINAL POST from 7:02 a.m. Thursday...

The Bottom Line

Cold air has returned. Meanwhile, our next weathermaker, arriving Thursday night into Friday, will NOT be a "snow" storm for New Jersey. In fact, for the southern half of the state, it's going to be almost exclusively rain. The farther north and west you are, the higher the risk of slippery roads, mainly due to sleet and freezing rain.

Latest forecast for Thursday night's ice and snow, as of Thursday morning. (Dan Zarrow, Townsquare Media)
Latest forecast for Thursday night's ice and snow, as of Thursday morning. (Dan Zarrow, Townsquare Media)
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This is the only substantial storm system in view, through the rest of February. Having said that, we have some real "weather whiplash" ahead — each day will be significantly warmer or colder than the day before.

Timeline

—Appetizer... An initial piece of energy will spark some spotty showers during the daytime hours Thursday. That will mainly affect the southern half of the state. And it will be mixed precipitation — mainly snow and sleet, with some rain to the south. (Of course, it depends on the exact air temperature at the time.) Since the ground is so warm and precipitation intensity will be rather light, I am not worried about widespread accumulations and travel headaches.

—Start... The "main event," with a block of widespread wintry mix precipitation, will slide into New Jersey Thursday evening. Possibly as early as 7 or 8 p.m.

NAM model forecast as of 10 p.m. Thursday evening, as wintry weather gets started. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
NAM model forecast as of 10 p.m. Thursday evening, as wintry weather gets started. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
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—Brunt... The steadiest, heaviest precip will occur overnight through early Friday morning, from about 11 p.m. to 9 a.m. Note that temperatures (both aloft and at the surface) will slowly rise during this time, so a transition from sleet/freezing rain to plain rain will progress from south to north. Most of the state will be wet, not wintry, by daybreak Friday.

NAM model forecast as of about 1 a.m. Friday morning, as the storm peaks and icy weather slowly transitions to just wet. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
NAM model forecast as of about 1 a.m. Friday morning, as the storm peaks and icy weather slowly transitions to just wet. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
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—End... The final piece of wintry mix (north) and rain (most) will clear the state early Friday afternoon. Skies will then clear, with breezy conditions and seasonable temperatures pushing into the 40s.

NAM model forecast as of about 7 a.m. Friday morning, as mainly rain falls over New Jersey through the morning rush. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
NAM model forecast as of about 7 a.m. Friday morning, as mainly rain falls over New Jersey through the morning rush. Blue=Snow, Pink=Sleet, Purple=Freezing Rain, Green=Rain. (College of DuPage Meteorology)
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The Wet Zone: South & Coast

This is the "green" area on my forecast map above. Almost all rain — sorry kiddies, you're going to have a full day of school (and work) on Friday. There could be a brief period (an hour or two) of sleet as things get started Thursday evening. And then, it'll just be rain, rain, rain for the duration.

Quick Ice to Rain: I-295 and Route 1 Corridor

The "light blue" color on my forecast map. The initial period of sleet and (primarily) freezing rain could be a bit more impactful than areas closer to the coast. But we'll flip to plain rain before the brunt of the storm begins overnight. So there could be some icy spots here Thursday evening. But by Friday morning's commute, you'll only be dodging puddles. The liquid kind.

Mainly Sleet: Northwest of the Turnpike

"Pink" on the map above. Here is where things may get especially icy and dicey. While you might see an initial period of snow Thursday evening, sleet will be the predominant precipitation type. Those ice pellets will be knocking on your windows through the overnight hours all the way into Friday morning's commute. There will be a transition eventually, but that may not happen until after daybreak.

Keep in mind, sleet does not accumulate like fluffy snow does. And it's slippery, but not as perilous as freezing rain. So nailing down the exact impacts in this area of the state is tricky. I do expect some school delays and even closings on Friday — superintendents and administrators would be wise to wait until the morning to assess conditions and make that local decision.

Snowy and Sleety: Far Northern New Jersey

The "blue" color along the northern edge of New Jersey. The only place in the state likely to stay below freezing for the duration of the storm. So it's the only place that could see substantial snowfall. Latest models are very consistent keeping any risk of heavy snow (6 to 8+ inches) north and west of New Jersey. But still, 2 to 4+ inches of snow is shovelable and possibly plowable. And there's a reasonably icing threat on top of that, due to sleet and freezing rain at the end of the storm. (Several forecasts are slightly higher than mine, but I'm betting on more sleet than snow getting involved.)

Winter Weather Advisory

NWS nailed it on the geography and messaging with this Winter Weather Advisory, issued for a total of 12 counties in northern and central New Jersey.

—From 7 p.m. Thursday to 10 a.m. Friday... Mercer and Middlesex counties.

—From 7 p.m. Thursday to 1 p.m. Friday... Bergen, Essex, Hudson, Hunterdon, Morris, Passaic, Somerset, Sussex, Union, and Warren counties.

A Winter Weather Advisory (purple) covers 12 of NJ's 21 counties, from Thursday evening through midday Friday. (Townsquare Media / AerisWeather)
A Winter Weather Advisory (purple) covers 12 of NJ's 21 counties, from Thursday evening through midday Friday. (Townsquare Media / AerisWeather)
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An "advisory-level" event cautions of treacherous travel conditions. But not as hazardous (or impossible) as a warning. Consider it a formal "heads up" to messy weather.

The Extended Forecast

Another burst of cold air arrives for the start of the weekend. Saturday looks partly sunny and dry. 20s in the morning. Only lower-mid 30s in the afternoon.

Sunday will easily be the warmer day of the weekend, in the seasonable 40s. I've removed previous chances of showers which look to stay away from NJ. In their absence, sunshine and breezy conditions will prevail.

Then Monday will flip-flop back to bitterly cold weather. Probably the coldest of the week, in fact. Teens in the morning, with the wind chill possibly dipping to zero. And afternoon highs may struggle to even reach the freezing mark.

While there are no significant storm systems in sight for the next week, we can't let our guard down. March can be a notoriously violent month of weather, as warmer air classes with colder air, and winter breathes its last gasp. Don't think we're done with snow and ice just yet.

Dan Zarrow is Chief Meteorologist for Townsquare Media New Jersey. Follow him on Facebook or Twitter for the latest forecast and realtime weather updates.

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