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January storm threat discussion #2


Ian

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The 5h pattern is pretty volatile...but DC does have the sfc high location going for it....it will help promote CAD all the way up the mid-levels. But given no block or anything, it can definitely wiggle quite a bit in any direction.

We probably won't do as well as Seattle though

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Interesting how the GFS was initially looking more like snow with the Euro looking more like rain up until the 00z runs tonight. The Euro is now in it's 96-120 hour wheelhouse where it usually cleans the clock of the GFS. Hopefully, that record continues. And I agree that any accumulating snow in these parts will do wonders for board morale.

MDstorm

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yes...this could easily trend warmer/drier....

The CAD is really strong on all guidance..even before 00z came south. I posted in the NE subforum how I thought it would almost be a lock for winter precip because of that...we now might get whiffed to the south, but even if it trends back north which is certainly a legit possibility...it could be an icing event for west of the fall line in DC metro with that ppt signature.

Its a legit threat though...only if because the antecedent air mass has some punch to it and the high will help hold it in.

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I didn't even think the GFS run was that bad...it wouldnt be snow, but it has the wedge and it would be legit icing....even DCA holds at 32 through 108 hours

It was a freezing rain run IMO... 850 0c line was north while 2m 0c line held into DCA through 108... prob a light snow to ice to drizzle finish

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I didn't even think the GFS run was that bad...it wouldnt be snow, but it has the wedge and it would be legit icing....even DCA holds at 32 through 108 hours

I agree that the 00z GFS was not terrible, but it certainly was not as good as earlier runs. The Euro 00z run was a "solid" improvement and nice to see at this point. We also have going for us the fact that JB has this event pegged for 40 north. He hasn't been right about a DC event in quite a while.

MDstorm

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no but the 500mb pattern continues to show some promise on the atlantic side....the PV is over greenland at the end of the run but heights are rising to the west and we have a 50-50 low that doesn't seem like it wants to race off

Hm talked about jan 30-31 possibility a few days ago which Gfs now has. Things are not as bleak as they were 3-4 days ago

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no but the 500mb pattern continues to show some promise on the atlantic side....the PV is over greenland at the end of the run but heights are rising to the west and we have a 50-50 low that doesn't seem like it wants to race off

I don't think it's much of a PV by that point anyway, which might be why the 50/50 low isn't a useless artifact. GFS/Euro + their ensembles all weaken the PV quite a bit in the long range and almost split it.

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Well, this is model showdown at its best. One of them, as of this morning, is going to lose big time with the event on Fri/Sat.

Where you guys placing your bets?

Probably on the Euro, when the GFS has it Euro doesn't, then they flip, Euro is usually right. GFS had the right idea, then flipped, so we'll see. That's my call.

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Well, this is model showdown at its best. One of them, as of this morning, is going to lose big time with the event on Fri/Sat.

Where you guys placing your bets?

Seeing as it is still noly Tues for something 3 days away, I will hold my chips off the table for another day. Too much variability to say one or the other. The high to the north is the key.

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What are we looking at though? Is that total snowfall for a given time frame? How long? Also, is it QPF or total snowfall?

That map was just for the hour of 18z on Saturday, there was some snow that fell prior to that and a little afterwards. But that was the bulk of the precip.

I also wouldn't believe it 100%, its a weenie map all the way. Wunderground's version of a clown map.

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