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Central PA Winter 2024/2025


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2 minutes ago, mahantango#1 said:

So with this model JB might be on to something.

Perhaps, NAM is putting out 0.6”-1.0”, with the 1.0” or so being near the DC area… which is probably about the limit given this system not really having a chance to wind up to any kind of full fledge coastal.

If this is going to actually crank out a swath of 10-15” amounts it’ll be due to ratios.. which may actually benefit the southern tier. In the NAM’s positioning, best mid level forcing would likely be in the southern tier which could enhance ratios thru more efficient snow growth further aloft. It’s already a pretty cold column as is, with the Kuchera method (which doesn’t account for actual snow growth processes) calculating 15-16:1 ratios for AOO/JST/MDT/THV/LNS. Could be a band(s) somewhere in there that may even best those ratios. Obviously a further south solution takes those dynamics south of the M/D line.

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Winter Storm Watch

URGENT - WINTER WEATHER MESSAGE
National Weather Service State College PA
340 AM EST Sat Jan 4 2025

PAZ036-064>066-042245-
/O.NEW.KCTP.WS.A.0001.250106T0500Z-250107T0500Z/
Franklin-Adams-York-Lancaster-
Including the cities of Chambersburg, Gettysburg, Lancaster, and
York
340 AM EST Sat Jan 4 2025

...WINTER STORM WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH
MONDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations 5 inches or
  more possible.

* WHERE...Adams, Franklin, Lancaster, and York Counties.

* WHEN...From late Sunday night through Monday evening.

* IMPACTS...Travel could be very difficult. The hazardous conditions
  could impact the Monday morning and evening commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

For more information from the National Weather Service visit
weather.gov/StateCollege

Steinbugl/Banghoff

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As we anxiously await the next run of the SNOWINPA model, today is a two-fer.  It's the latest sunrise of the year AND it's perihelion.  When the Earth is closest to the sun, it is travelling faster in its orbit (Keplar's second law for extra brownie points).  As such, meteorological winter is roughly 2 days shorter than meteorological summer in the northern hemisphere.  

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Only two models that give me anything substantial, and by that I mean 1-2 inches, is the NAM and NAM 3k. All of the others are way south and some even near misses. At this point, unless something significant changes (which I doubt) I'd be happy to not even see a flake and for everything to just stay south of I-81 and I-78. As for next Saturday's chance, meh. I'll believe it when I see it. I'm not going to invest nearly as much emotion into it.

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