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Feb Long Range Discussion (Day 3 and beyond) - MERGED


WinterWxLuvr
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13 minutes ago, WEATHER53 said:

Had 3.5 yesterday, compacted down to 2 and back up to 3.25

Overall the models and most forecasters  missed this for DC proper. Not so close by but that is the most frequent finish to Bs.

Not a bust and there have been several awful painful historic ones. Not a hit either.   This seems to start reversal of our bad winter pattern and we might not get above 25 by Sun and Mon 

Wrong thread chief. 

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6 minutes ago, stormtracker said:

GFS blows chunks

Now...I hesitate to ask (because I'm no longer use which questions are obnoxious), what's the little split thing the GFS is doing here? This just the two piece of energy not phasing with each other...and one going one OTS and the other cutting? (now I'm not familiar with a "cold" cutter)

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Does anyone else find it sort of funny the normally cold biased GFS basically has had Op run after Op run the last 3 days with the trof digging the least and the most SE ridging the next 2 weeks out of the three major globals?  Really strange.  The CMC and Euro have been repeatedly keeping the thermal gradient centered in the gulf states run after run 

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Euro's Sunday storm doesn't have the trough digging as much as it did for the massive 12z storm, but still gets the job done. 0z GEFS also backed off of the Euro idea with a flatter and more broad trough (product of less ridging out west to my novice eyes?), but still has the window there. Will be interesting if the EPS bleeds to the GEFS solution, but obviously we're still way at range. Euro's solution is still pretty fun to see still lol

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5 minutes ago, Cobalt said:

Euro's Sunday storm doesn't have the trough digging as much as it did for the massive 12z storm, but still gets the job done. 0z GEFS also backed off of the Euro idea with a flatter and more broad trough (product of less ridging out west to my novice eyes?), but still has the window there. Will be interesting if the EPS bleeds to the GEFS solution, but obviously we're still way at range. Euro's solution is still pretty fun to see still lol

Euro  has a great lakes low but we still get a quick 4-8" and don't changeover.

 

Going to blow around quite a bit with a 960 low in the gulf of  ME

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1 minute ago, Amped said:

Euro  has a great lakes low but we still get a quick 4-8" and don't changeover.

12z had that feature too. Not really sure how that doesn't impede the storm but it's still an interesting solution, but yeah how can a 999 lp near Ohio and a 985lp off the coast of NJ both strengthen like that at the same time? :p

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1 minute ago, Cobalt said:

12z had that feature too. Not really sure how that doesn't impede the storm but it's still an interesting solution, but yeah how can a 999 lp near Ohio and a 985lp off the coast of NJ both strengthen like that at the same time? :p

Quite an odd looking 500mb map.   Actually has the polar vortex bent in a way it could phase and form a major storm.

c2TzM4K.png

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LWX morning AFD discussing the Sunday potential... even talks about dangerously low wind chills possible on Monday

.LONG TERM /FRIDAY THROUGH MONDAY/...
Low pressure over Lake Superior Friday morning is forecast to track
northeastward up the Saint Lawrence River Valley. This will drag a
cold front across the Middle Atlantic by Friday afternoon. Lingering
scattered showers are likely for a time ahead of the front during
the first half of the day, and some brief wintry mixed precipitation
can`t be ruled out given residual lower-level cold air in place
(especially where a thicker snow pack persists).

Thereafter, a robust blocking ridge is forecast to begin developing
over west-central Greenland into the Davis Strait. This will force a
broad, deep trough southward from the Arctic regions of far northern
Canada into the northern United States. This trough will likely
spawn low pressure at the surface near the north-central coast of
the Gulf of Mexico Saturday afternoon. Where it goes after that is
the all important question for the weather locally. The anticipated
position of a ridge just west of the West Coast of North America
would suggest a track just west of the crest of the Appalachian
Mountains, but the broad, deep and progressive nature of the
longwave trough would suggest a flatter track out into the western
Atlantic Ocean. Subtropical ridging near the Greater Antilles and
the aforementioned downstream blocking near Greenland/southeastern
Canada may prevent a harmless out-to-sea track, though. As such,
most guidance has some semblance of measurable precipitation during
the second half of the weekend, but there is a lot of spread as to
how much. As usual, this will depend on the ultimate track and
strength of low pressure.

The ECMWF model continues to depict a more amplified solution, and
its ensemble mean has trended up with probabilities for accumulating
snow over the last several runs. This, combined with at least a
loose clustering of low pressure tracks just off the Carolina coast
from the NAEFS and near to below normal temperatures during this
time would tend to support the threat of some wintry weather Sunday.

Regardless of whether or not snow is observed, an outbreak of Arctic
air will rush across the region early next week. Dangerously low
wind chill temperatures would be likely in this scenario on
Monday.

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3 hours ago, Amped said:

Euro  has a great lakes low but we still get a quick 4-8" and don't changeover.

 

Going to blow around quite a bit with a 960 low in the gulf of  ME

That is not the typical great lakes low lol.

That is a muther of a daughter vortex dropping down. It is cold ahead of it, and super cold behind it.

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6 minutes ago, CAPE said:

That is not the typical great lakes low lol.

That is a muther of a daughter vortex dropping down. It is cold ahead of it, and super cold behind it.

Was it phasing in with the SLP on the 12z run and that's how we got the mega snows?  Or am I wrong and it was something completely different that caused that?

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9 minutes ago, yoda said:

Was it phasing in with the SLP on the 12z run and that's how we got the mega snows?  Or am I wrong and it was something completely different that caused that?

There is interaction/phasing in both cases, but on the 12z run the southern energy was more amped/further south and stayed separate until much later/closer to the east coast.

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