E PA/NJ/DE Winter 2024/25 Obs/Discussion

[RedSky]

Keeps snowing here on the back edge 

 

[RU848789]

1 hour ago, RU848789 said:

Less intensity the last hour, so as of 11:30 pm we're now at about 0.9" with the temp finally down to 32F, so we should start seeing some accumulation on paved surfaces.  Latest HRRR still showing another 1-2" overnight for most of CNJ/NNJ/NYC, so 2" is easily within reach here and for most, with some areas in the Lehigh Valley, NWNJ, Bucks, Montco, the Poconos, etc. already having reached 2"+.  

So, as of 12:30 am, we're up to 1.1" with 0.2" falling the past hour; temp still at 32F and with wet paved surfaces, it'll still take more intensity (to overcome the melting from liquid water probably at about 33F) or a drop to 31F to get some accumulation on paved surfaces.

[RedSky]

3.3" with some pixie dust 

29F

 

[LVblizzard]

I wonder how much of this snowpack will stick around till Christmas. I like our odds of a white Christmas with temps not getting above freezing for the next 3 days and the low sun angle, plus the chance of a little bit more on Tuesday.

[RU848789]

1 hour ago, RU848789 said:

So, as of 12:30 am, we're up to 1.1" with 0.2" falling the past hour; temp still at 32F and with wet paved surfaces, it'll still take more intensity (to overcome the melting from liquid water probably at about 33F) or a drop to 31F to get some accumulation on paved surfaces.

Best hour of the storm with 0.3" bringing us to 1.4" as of 1:30 am and with temps steady at 32F, we're finally seeing some accumulation on paved surfaces (just a coating so far, but assuming we get another 1/2"-1", much of that should end up on the paved surfaces now (once the snow has a foothold, subsequent snow falls on 32F snow, not slightly warmer cement, and accumulates readily).

Nap time for the next ~3 hours; hopefully the HRRR/RAP hi-res models, which have been doing well continue to do so, as they show another 1" for much of CNJ and 1"+ for all of NENJ/NYC from now through 7-8 am.
 

[RedSky]

27 minutes ago, LVblizzard said:

I wonder how much of this snowpack will stick around till Christmas. I like our odds of a white Christmas with temps not getting above freezing for the next 3 days and the low sun angle, plus the chance of a little bit more on Tuesday.

Nothing but some sublimation the next three days and cloudy Tuesday we good

[RedSky]

Not done yet here comes that piece of energy for the Lehigh Valley and Bucks

[Physicsteve]

Getting clipped by what looks to be the last band here with steady light, almost moderate rates at 4am. Eyeballing 2.5 inches on elevated surfaces, about an inch on patio and driveway. Had a smattering of flurries throughout the morning yesterday but started snowing consistently around noon. However didn’t really start to accumulate until about 4 when the sun started setting. Was not delayed or denied and probably maxed out potential here. Nice event. Looking forward to Saturday football with snow on the ground and xmas lights. 

[wkd]

4" from the event and still snowing lightly.

[RU848789]

3 hours ago, RU848789 said:

Best hour of the storm with 0.3" bringing us to 1.4" as of 1:30 am and with temps steady at 32F, we're finally seeing some accumulation on paved surfaces (just a coating so far, but assuming we get another 1/2"-1", much of that should end up on the paved surfaces now (once the snow has a foothold, subsequent snow falls on 32F snow, not slightly warmer cement, and accumulates readily).

Nap time for the next ~3 hours; hopefully the HRRR/RAP hi-res models, which have been doing well continue to do so, as they show another 1" for much of CNJ and 1"+ for all of NENJ/NYC from now through 7-8 am.
 

Just woke up and took a nice walk outside in the gorgeous silence of a fresh snowfall.  As of 5:30 am, we're up to 2.6", which is 1.2" the past 3 hours or 0.4" per hour and the radar loop from the last 3 hours looks like the snow was pretty steady for most of NNJ/CNJ (N of 195) and all of NYC and it still looks pretty good for another hour or two.  Temp is down to 31F and all paved surfaces are covered with about 1" of snow.  Huge overperformer - think we'll make it to 3" as the latest HRRR still shows another 1/2-3/4" for most of NNJ/CNJ (especially the eastern half as the back edge of precip approaches) - as I said when they posted the advisories last evening, Middlesex County should've been part of it.

[RU848789]

Selected NWS reports, i.e., only from stations reporting after about 1 am (except for SNJ where the snow ended earlier), since any reports before that would be incomplete. A general 2-4" for the advisory counties (everything N of 276/195 in PA/NJ, except for Monmouth and Middlesex) and for Middlesex too.

Public Information Statement
National Weather Service Mount Holly NJ
514 AM EST Sat Dec 21 2024

...UPDATED SNOWFALL REPORTS AS OF 5 AM...

Location Amount Time/Date Provider

...New Jersey...

...Burlington County...
Columbus 2.0 in 0245 AM 12/21 Trained Spotter
Mount Holly WFO 1.6 in 0500 AM 12/21 Official NWS Obs

...Gloucester County...
Washington Twp 1.3 in 1005 PM 12/20 Trained Spotter
Mantua 1.0 in 0402 AM 12/21 Public

...Hunterdon County...
Clinton 3.8 in 0345 AM 12/21 Trained Spotter
Whitehouse Station 3.1 in 0340 AM 12/21 Trained Spotter

...Mercer County...
Trenton Mercer Airport 2.3 in 1200 AM 12/21 ASOS
1 N Hamilton Square 1.9 in 0100 AM 12/21 Trained Spotter

...Middlesex County...
North Brunswick 2.4 in 0211 AM 12/21 Public
Piscataway 2.2 in 0145 AM 12/21 Public
South River 0.8 in 0330 AM 12/21 Trained Spotter

...Monmouth County...
Freehold 2.0 in 0430 AM 12/21 Trained Spotter

...Morris County...
Butler 3.7 in 0504 AM 12/21 Public

...Somerset County...
Warren 3.0 in 0500 AM 12/21 Public

...Sussex County...
Sparta 4.5 in 0445 AM 12/21 Trained Spotter

...Pennsylvania...

...Bucks County...
1 ESE Fricks 3.3 in 0430 AM 12/21 Trained Spotter
Furlong 3.1 in 1230 AM 12/21 Trained Spotter
Warminster 3.1 in 0500 AM 12/21 Trained Spotter

...Lehigh County...
1 SSW Ancient Oaks 4.1 in 1245 AM 12/21 Trained Spotter

...Monroe County...
Coolbaugh Twp 3.5 in 0300 AM 12/21 Trained Spotter

...Montgomery County...
Horsham 3.3 in 1145 PM 12/20 Public
Trappe 1.8 in 0330 AM 12/21 Trained Spotter

...Northampton County...
Nazareth 4.6 in 0500 AM 12/21 Public
Martins Creek 3.4 in 0230 AM 12/21 CO-OP Observer
North Catasauqua 2.8 in 0510 AM 12/21 Trained Spotter

[Tatamy]

Storm total 3.2” here in Bethlehem Twp., PA

[Ralph Wiggum]

3.2" here in Ivyland

[RU848789]

2 hours ago, RU848789 said:

Just woke up and took a nice walk outside in the gorgeous silence of a fresh snowfall.  As of 5:30 am, we're up to 2.6", which is 1.2" the past 3 hours or 0.4" per hour and the radar loop from the last 3 hours looks like the snow was pretty steady for most of NNJ/CNJ (N of 195) and all of NYC and it still looks pretty good for another hour or two.  Temp is down to 31F and all paved surfaces are covered with about 1" of snow.  Huge overperformer - think we'll make it to 3" as the latest HRRR still shows another 1/2-3/4" for most of NNJ/CNJ (especially the eastern half as the back edge of precip approaches) - as I said when they posted the advisories last evening, Middlesex County should've been part of it.

Swear I posted this 30 minutes ago, but I don't see it, so here goes...

As of about 6:50 am we had 3.2" on the ground, as per the picture, and since then we got about another 0.1" for a final total of 3.3", as the snow appears to be over as of about 7:15 am. Damn fine storm, way overperforming my prediction of 1.25" - I'll take the bust, lol, as it's just so gorgeous out there, as per the 2nd pic of the pond across the street from us (have always loved that view from our house).

It's down to 30F. And now the bitter cold comes, so I'd expect us to have our first white Christmas in years, as temps won't go above 32F again until Tuesday afternoon (and just barely into the mid-30s and then back below 32F by sunset) and the sun angle for melting doesn't get any lower.

[RU848789]

So our 3.3" was just slightly below my 1.25" prediction (and the NWS ~0.8" prediction early on 12/20), lol. Wasn't quite as much of an overperformer as 2/17/24, when we got 11.25" in the Norlun Trough Deathband from Heaven vs. the 3-5" predicted, but still a substantial positive bust. I'll take it and I suspect most others won't mind this one, as it's a Saturday and accumulations on pavement for those outside of far NW locations was minor.  Plus, this much snow with the coming cold means a white Christmas.  

This plus about 0.3" from the snow showers on 12/5 puts me at 3.6" for the season.

[Physicsteve]

Measured with a ruler instead of eyeballs and going with 2.75” here. Perhaps closer to 2.5, but what’s a quarter inch between friends?

[Newman]

Around 2.5" on the back deck, but more like 1.5" on the measuring board. So we'll go with ~2" here in Fleetwood

[The Iceman]

2.5” in Levittown, way exceeded expectations 

[Albedoman]

7 hours ago, RedSky said:

Nothing but some sublimation the next three days and cloudy Tuesday we good

well Red Sky, you will have your white Christmas like I had promised. The big snow event was last night and not on Christmas eve/day .  As I said my earlier posts days ago, if their was a decent snow pack, we would have below zero overnight lows. Well Monday morning wil be a dandy  with temp below zero at my house and for many in the LV.  I expect a 1-2 inch refresh of the snow pack on Christmas Eve and then it is off to big time moderation with lots of rain maybe an ice storm.  This MAJOR pattern change coming up may lead to some decent snow events in mid january

[ChescoWx]

Winter began this morning at 4:21am. Snow amounts last evening and overnight ranged from between 0.8" to 2.0" across the area. Our coldest air of the season has moved in for the weekend. We should remain below freezing for the next 3 days before finally rising above freezing during Christmas Eve Day. We could see low temperatures by Monday morning as low as 5 degrees above zero. We could see another round of light snow overnight Monday into Christmas Eve morning. Temperatures look to rebound to near normal to close out Christmas Week.

[Hurricane Agnes]

Measured 2.70" this morning and bottomed out at 28.  There's a streamer of something overhead although it's been mostly virga so far.   Currently overcast and 30 with dp 23.

Happy first day of winter!

[Kevin Reilly]

10 minutes ago, Hurricane Agnes said:

Measured 2.70" this morning and bottomed out at 28.  There's a streamer of something overhead although it's been mostly virga so far.   Currently overcast and 30 with dp 23.

Happy first day of winter!

Right on time!!!  Spring will be too in a week when it hits 50f. 

[JTA66]

18 minutes ago, Hurricane Agnes said:

Measured 2.70" this morning and bottomed out at 28.  There's a streamer of something overhead although it's been mostly virga so far.   Currently overcast and 30 with dp 23.

Happy first day of winter!

Had a few flakes fall from the sky under that.

28F/DP 21F…looks like winter, feels like winter and it is winter. Doesn’t always happen like that around here.

[KamuSnow]

3 hours ago, Newman said:

Around 2.5" on the back deck, but more like 1.5" on the measuring board. So we'll go with ~2" here in Fleetwood

You need to talk to your measuring board!

[ChescoWx]

Not thinking (at least here in East Nantmeal) we will still have at least 1" on the ground come Christmas morning but....with another shot of a little snow on Christmas Eve morning we shall see.

But below is the history of at least 1" of snow on the ground on Christmas Day. The below is for Coatesville 1SW (1893-1982) / Coatesville 2W (1983-2007) and East Nantmeal Township 2008 to Present. We have gone 12 years without a White Christmas. The longest stretch between such occurrences was the 16 years between 1930 till 1947.

[Chadzachadam]

Elevation and tree cover made a big difference around here (NW Philly). At the bottom of the hill (lots of paved surfaces, elevation ~25ft) I would call it just a trace. At the top of the hill (lots of trees, elevation ~175ft) they got probably 1.25". I'm in the middle and have about an inch on the deck and 0.6" in the yard

[penndotguy]

28f final total @ 2” in Spring Twp, Berks. We never really had moderate snow it was just steady started about 11am.