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February 10-12, 2021 Winter Event


MN Transplant
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Looking at the snow maps, less amped might be the best way to put it. Not sure it really moved all that south... just not nearly as impressive.
18z
1613109600-Jufg3ji5o44.png&key=f2fd3cd28529e4ef1cdb9b68aa5d081c63831e2d2919aa22b1453f163973c120
12z
1613109600-atUSikIUXbM.png&key=f17509165bfbb564b708522588305de4827cbf869efcd47df0289b00fdcfa44a
 
The euro and ensembles took us from 13 inches to 3 in one day....2 days before the event. I don't buy it..the euro is acting like a jv model
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Assuming a 17/1 ratio per Kuchera, DC-area could get close to 5".  Limiting the upper bound to a more realistic 12/1 yields 3-4".   Of course, temperatures may reach the mid 30s on Thursday afternoon during the lull.  So we could lose a bit due to melting by the time of the 2nd wave, which is forecast to drop 0.2-0.3" of snow per hour - for several hours 

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25 minutes ago, NorthArlington101 said:

Looking at the snow maps, less amped might be the best way to put it. Not sure it really moved all that south... just not nearly as impressive.

There is a limit to how far south the cold can get given the latitude at which the wave is crossing at.  The cold can't penetrate south of the actual wave since that will ride the boundary...and to press the wave south...force it to sink, at that point there is so much suppression you are squashing it and that is what is happening now.  

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10 minutes ago, psuhoffman said:

There is a limit to how far south the cold can get given the latitude at which the wave is crossing at.  The cold can't penetrate south of the actual wave since that will ride the boundary...and to press the wave south...force it to sink, at that point there is so much suppression you are squashing it and that is what is happening now.  

Was thinking about this earlier. How often is it that a weak wave gets pressed so intensely and manages to produce? Models for a while wanted to say you could just move the whole event south no biggie, just changes who jackpots. But in reality a weak wave getting this rough treatment from the north isn't going to just move south. It's going to die. 

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Since these are similar boundary waves might be pertinent to consider the NAM just schooled EVERYTHING else on the wave to our north today... it was well north of all other guidance at just 24 hours lead time and scored the coup.   Something to consider once this gets inside short range...wave 1 is almost there but wave 2 is still not.  

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I feel somewhat more optimistic given that the cold high in Iowa is fading while the parent high, a monster 1062 mb center up in the NWT, is slowly pushing south. That should stop the southward push on the wave train and when I look at the RGEM output the precip shield looks realistic but the thickness and thermal profiles look unrealistic (too far north) which would argue for more of the depicted precip to fall as snow. Hence an early call of 4-7" for the I-95, max could be a bit south of the DC-BWI-ILG corridor at 5-9" but I don't think it would be pushed as far south as RIC. 

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2 minutes ago, Roger Smith said:

I feel somewhat more optimistic given that the cold high in Iowa is fading while the parent high, a monster 1062 mb center up in the NWT, is slowly pushing south. That should stop the southward push on the wave train and when I look at the RGEM output the precip shield looks realistic but the thickness and thermal profiles look unrealistic (too far north) which would argue for more of the depicted precip to fall as snow. Hence an early call of 4-7" for the I-95, max could be a bit south of the DC-BWI-ILG corridor at 5-9" but I don't think it would be pushed as far south as RIC. 

Weren’t you calling for 12 or 18” last weekend?

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