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Central PA Winter 2024/2025


Voyager
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5 minutes ago, Jns2183 said:

The question isn't the surface there, it's the 925mb which @MAG5035 has a much better hold on than me. I truthfully could see us getting a nice little glacier going with all 3 types which than flows into colder temps Friday night and more icing than forecast before rain

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I think it is assumed surface will be cold enough.    Once CAD breaks it will topple quickly (unless it does not).

 

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I think it is assumed surface will be cold enough.    Once CAD breaks it will topple quickly (unless it does not).
 
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I don't think the surface will topple until the precipitation is almost all through. At least up here in the Cumberland valley near Harrisburg

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1 hour ago, Bubbler86 said:

Below freezing about 850 and down during the GFS sleet storm

 

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Looks pretty shallow to me. I’d wager zr with some pingers if qpf is stoudt enough. I’d like that freezing a little closer to the 700s for a pingerfest. Regardless looking icy for a bit. 

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1 hour ago, Jns2183 said:

24 hours ago my forecast high was 55. I made it to 43 today

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Yeah busted over here as well. I saw 45 on digi car thermo at 330. Forecast was for low 50’s. Cad baby.

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1 hour ago, Jns2183 said:

My question is when have forecast last overdone CAD in a situation like this

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It’s rare. If we start out with temps in the upper 20’s when the precip arrives it’s difficult to dislodge historically. 

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3 minutes ago, GrandmasterB said:

It’s rare. If we start out with temps in the upper 20’s when the precip arrives it’s difficult to dislodge historically. 

The question is, if it raining at 29 or 30 during daytime in Feb, are there any real issues?  30ish is pretty high for freezing rain during the day. Sleet bomb is a total different story.  That will readily lay at 30ish.

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11 minutes ago, Bubbler86 said:

The question is, if it raining at 29 or 30 during daytime in Feb, are there any real issues?  30ish is pretty high for freezing rain during the day. Sleet bomb is a total different story.  That will readily lay at 30ish.

Yeah, great question. That’s why I enjoy tracking ice storms. They can be tricky because heavy rain at 30 degrees doesn’t do a lot. Pretty much just runs off before it can accrete. But an 80/20 mix of freezing rain and sleet coming down light or moderate at 28 degrees can by highly impactful. We’ve witnessed busts in both directions with these set-ups. A lot of nuance. 

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5 minutes ago, GrandmasterB said:

Yeah, great question. That’s why I enjoy tracking ice storms. They can be tricky because heavy rain at 30 degrees doesn’t do a lot. Pretty much just runs off before it can accrete. But an 80/20 mix of freezing rain and sleet coming down light or moderate at 28 degrees can by highly impactful. We’ve witnessed busts in both directions with these set-ups. A lot of nuance. 

Yea, another good point.  Heavy vs light rain.  

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