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Central PA Winter 2024/2025


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1 hour ago, Jns2183 said:

Do we get ice storm warning or just a winter advisory Thursday?

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Certainly the QPF involved in most of the models would imply a winter/ice storm warning in potentially a sizeable swath of central PA is on the table depending on the makeup of the p-types. Surface temps hold near or below freezing for most of the event in a lot of CTP, including even the LSV seeing several hours.  Significant 850mb level WAA push early in the event would make any snow brief and set up for trying to figure out how the business end of the precip event plays out in terms of sleet vs ZR. Euro showing more of a straight freezing rain on it’s p-types but 925mb temps, which doesn’t get routed out as fast are quite cold and I would think reality would have a period of sleet involved more like what the 0z NAM/GFS/RGEM are implying. 

Either way I’m seeing enough support right now to think winter storm watches may be needed in the 80 and south counties of C-PA, save for maybe Adam’s/York/Lancaster. The north central counties well north of I-80 need 0.5” or more for an ice storm warning and given varying precip types and potentially less QPF overall they probably wouldn’t verify that higher criteria. Biggest overall ice accumulation threat would reside in the eastern Laurels and the more immediately adjacent ridges off the Allegheny Front where the 925 temps would rout out quickest. Could be talking 0.5”+ of ice accrual there. I think overall it’s a pretty sizeable icing threat. CTP notes it in their disco and HWO. And it looks like we do a similar setup again for the weekend, so fortunately the temps warm up briefly in between events.

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Finished with .2" of snow and sleet last evening. It's been a crazy morning in the office...

Had a team member involved in an accident earlier - she's going to be okay, her car is as she described to me via Teams is finished. Personally, I slid multiple times on my way in to work and I was driving VERY defensively. As others have mentioned, back roads (even some significantly traveled roads around here) were awful. Which raises this question:

WHY...why was the Donegal School District (and others, I presume) not on a delayed opening this morning? I really don't like to question other's decisions, this seems baffling. I thought road conditions were worse today than in at least the past several years. 

I don't understand. 

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MU Weather Center

Due in large part to the #ArcticOutbreak from Jan. 20-24, #January2025 concluded as the coldest winter month (DJF) at@millersvilleu since January 2018. Despite above-average snowfall (11.1"), it was the 6th-driest January on record at the 'Ville.

That's maximizing snowfall potential in that data. 

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9 minutes ago, Itstrainingtime said:

Finished with .2" of snow and sleet last evening. It's been a crazy morning in the office...

Had a team member involved in an accident earlier - she's going to be okay, her car is as she described to me via Teams is finished. Personally, I slid multiple times on my way in to work and I was driving VERY defensively. As others have mentioned, back roads (even some significantly traveled roads around here) were awful. Which raises this question:

WHY...why was the Donegal School District (and others, I presume) not on a delayed opening this morning? I really don't like to question other's decisions, this seems baffling. I thought road conditions were worse today than in at least the past several years. 

I don't understand. 

Ive been in New Hampshire that last 2 weeks, but was there even a Winter Weather Advisory put out?

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7 minutes ago, canderson said:

I work from home Mondays so haven't even walked outside but the trash guys were slipping and sliding this morning. 

Thursday looks interesting. Been a while since we had an ice event of .25". 

I was just talking about the V-day Ice storm we had (sorry i forget year) and what a cluster that was. Snow, sleet then frz rain. When all the vehicles were stranded on 78. Were you living here then?

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Our 0.3" of snow/sleet and then some freezing fog this morning resulted in multiple 2-hour school delays this morning. This week looks to feature significant fluctuations in temperatures with highs near 50 degrees today and again on Thursday.....but more snow, sleet, freezing rain and plain rain in our future starting on Wednesday afternoon and into Thursday morning. We may get to do the whole wintry mess all over again come Saturday later in the day.

image.png.c1b7b953e3b8a11610665d9e636fcfc8.pngimage.thumb.png.75868a05426c98bba6d56479f6e2c36a.png

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8 minutes ago, sauss06 said:

I was just talking about the V-day Ice storm we had (sorry i forget year) and what a cluster that was. Snow, sleet then frz rain. When all the vehicles were stranded on 78. Were you living here then?

2007. We had just moved here a few months before and that was our first winter storm. What an experience and life-lesson learned that was. Our car got stuck in our alley for 2 days (we back into our garage and it got stuck into ginormous ice ruts) 

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The first model run of the day the 12z NAM which is a bit out of it's range has temperatures here at the surface staying below freezing all day Wednesday and through around 8 or 9am on Thursday. While that is happening warmer air will be moving in above us at around 5k feet. Meaning by about 4am on Thursday morning temperatures will be well above freezing where snow is made. This means whatever falls after that time will be some form of non-snow meaning sleet or freezing rain. Then it will be a race to see how we get the surface to warm for plain rain.image.thumb.png.f7fab72e20a5c4c9ec336d72cd06cd59.pngimage.thumb.png.903f76d41409c6ebcb3f39864b05bac8.pngimage.thumb.png.197b3c69254537b05d58bc21c21cc166.png

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The first model run of the day the 12z NAM which is a bit out of it's range has temperatures here at the surface staying below freezing all day Wednesday and through around 8 or 9am on Thursday. While that is happening warmer air will be moving in above us at around 5k feet. Meaning by about 4am on Thursday morning temperatures will be well above freezing where snow is made. This means whatever falls after that time will be some form of non-snow meaning sleet or freezing rain. Then it will be a race to see how we get the surface to warm for plain rain.image.thumb.png.f7fab72e20a5c4c9ec336d72cd06cd59.pngimage.thumb.png.903f76d41409c6ebcb3f39864b05bac8.pngimage.thumb.png.197b3c69254537b05d58bc21c21cc166.png
That's a @Bubbler86 special

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3 minutes ago, GrandmasterB said:

Colder run of the GFS for Thursday. Temps in the upper 20’s with sleet/freezing rain. Interesting to see if that holds or not. 28 vs. 31 makes a pretty big difference as precip is falling. 

Ice Storm Watch???

Breaks in OVC with blue patches beginning to appear.  Sun not out quite yet but soon.  Temp has crawled above freezing to 33.1 after a low overnight of 22.6 F.  There must have been a period of cleared skies to allow that cold of a low with a few hours of radiation.  Already a tiny bit of crazy.  Also, I have determined that the majority of my precip last night was not freezing rain, but rather sleet.  There had to be some freezing rain because the sleet is stuck together.  I think I'm going to record 0.2" of sleet/snow for yesterday.  I'll have the melt down shortly.

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