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February 15-MOrch possible wintry threats


tombo82685

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attachicon.gif020913-MODEL1.jpg

 

Pretty easy to see why the GFS is showing snow and the Euro is not.  GFS is sharper with the northern trough and is more robust.  Euro is flatter with the northern trough, less robust although compared to the 12z run it is a much closer look to the GFS last than it was 12 hours ago.

Absolutely on point. 06z GFS backed down a bit on intensity looking more like the 00z Euro. There likely will be many more shifts as minor initial differences can have a large impact downstream in this situation

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it's all going to come down to how much interaction with the northern stream occurs. Less interaction a more euro like solution...More interaction a gfs like solution at 0z. Also, you are going to need that strengthening storm. A weak storm with lgt precip probably won't overcome the bl issues in the philly area and south. Actually i take that back. 6z gfs looked goood. SV maps has 2-4 around philly.

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BTW, 6z GFS looks an awful lot like the 0z Euro at 500 mb.  The result is a less robust storm...still produces some rain and snow but it's more of a slopfest than a thump.

 The 06z GFS has backed off on the VD storm from the 00z run for the last 3 nights. For some reason the off-hour GFS runs for this storm are not as robust

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Which storm is everyone talking about? The VD storm or the weekend storm? To my untrained eye, the 6z looked like it had a big storm for the weekend, but with some p-type issues.

 That weekend storm on the 06z gfs is quite a bomb. Shows the potential - need the right combination of storm impulses to set it off.

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it's all going to come down to how much interaction with the northern stream occurs. Less interaction a more euro like solution...More interaction a gfs like solution at 0z. Also, you are going to need that strengthening storm. A weak storm with lgt precip probably won't overcome the bl issues in the philly area and south. Actually i take that back. 6z gfs looked goood. SV maps has 2-4 around philly.

Clown map only has 0-1" for the entire area.

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We really need some good model runs today otherwise its time to .....

Too much of a thread-the-needle, not alot of wiggle room. If itcomes North we deal with the WAA, or we get skirted to our South. We really need interaction with that Northern jet. Remember what happened with the last system....models progged early interaction and we didn't get it. Not saying it wont happen, but the last system teased us with the interaction.

 

My first guess (TM?) is a slider just to our South with light non-accumulating snow/mix here.

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Here's the 6z GFS and it's possible triple phaser:

1st frame, 2 vorts phasing in...

e4anyza3.jpg

2nd frame....

-NAO devloping with a nice 50-50 low. Watch the area circled in red, another potent vort dropping over top of the ridge.

9uzuryba.jpg

3rd frame:

that back side VOrt is dropping in wicked hawdcowe.(red area) 1st phase system is already going neutral tilt. Nice blocking in the ATlantic, which is what you would need to slow everything up.

vejyhaty.jpg

4th frame:

back side vort(red area) phasing in to the already potent lead wave, BOOM goes the dynamite.

na9yrame.jpg

Not a forecast, just strictly breaking down what i'm seeing on the 6z GFS.

i'm assuming this would be a triple phase?

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Here's the 6z GFS and it's possible triple phaser:

1st frame, 2 vorts phasing in...

2nd frame....

-NAO devloping with a nice 50-50 low. Watch the area circled in red, another potent vort dropping over top of the ridge.

3rd frame:

that back side VOrt is dropping in wicked hawdcowe.(red area) 1st phase system is already going neutral tilt. Nice blocking in the ATlantic, which is what you would need to slow everything up.

4th frame:

back side vort(red area) phasing in to the already potent lead wave, BOOM goes the dynamite.

Not a forecast, just strictly breaking down what i'm seeing on the 6z GFS.

i'm assuming this would be a triple phase?

 

it's hard to tell since you have to turn your whole body to see.

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