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Thursday 1/20/22 Stat Padder Discussion and Observations


stormtracker
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Latest HRRR shows more snow in NJ and into NYC / LI than our area 

GFS may be turning us over too quickly - almost all other models are less snowy this AM.

Radar is definitely juicy to the west and temps are down to 37 here, so let’s see how this all unfolds. 

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Have a good friend from my college days who lives out in Lexington KY reporting heavy snow - big flakes with 1” per hour rates. Said temps crashed like a rock once the main batch of precip arrived and it’s sticking with ease. 

Heavy snow in WV and KY with a moisture train trailing back to the TX / LA border with strong thunderstorms popping up on the tail end. Not sure how much of that precip is supposed to make it up this way, but if we can drop to freezing by 6-7am, we should be money for 2-3” of paste. 

Just had a heavy rain shower come through. Temps falling slowly. 38*F

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Changeover happening as we speak in higher elevations up highway 15 near Thurmont and smithsburg, as well as in NoVA. Rain/snow line appears to be right along I-81 currently. Heavy precip along the front and streaming in from the SW as this unfolds. All comes to how much QPF remains once we flip over. If there’s another 0.25” of liquid left in the tank, we still have a shot at 2”.

Can definitely see how the GFS (with its known biases) was seeing 3-4” in the metro corridor yesterday. Should still see a decent amount of QPF as precip is coming in like a wall, but the GFS is likely going to be slightly off when it comes to changeover time, which makes all the difference in a marginal event. When we fall short in these setups, this is almost always exactly why. Models bring in cold air just too soon and overestimate remaining precip once the flip occurs.

We should know by 7-8a whether or not this will dud. NWS sticking with their guns (renewed the WWA @ 3:40 AM — 2” with 3-4” lollies from 6a-1pm) Let’s see if they’re right. 

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7 minutes ago, jayyy said:

35.5F with rain

Come on temps, fall faster. 

Think this one is going down as a bust. We NEVER do well with these kinds of waves where it starts as rain and then will change over to snow. The cold is always later arriving than models believe. I'm supposed to be flipping over in the next hour and it looks like the cold air is still stuck up in PA northwest of Hagerstown.

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To the naked eye, timing wise, it looks like the best dynamics may be east of us by the time the flip occurs. Snow/rain line getting stonewalled around the BR. Need that sucker to starting pushing SE.  Seeing heavy precip roll in now with some nice yellows and dark greens in DC proper. Should help the cause and cool the column down. Have to hope there’s enough juice left in the tank for us to cash in a quick couple of inches. Not looking likely though 

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