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2013 Mid-Atlantic Severe General Discussion


Kmlwx

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39N 77W? That's almost right over DC. Pretty astounding if it comes to fruition, which it likely won't. #stupidNAM

 

Re Today: Watch the first 10 miles of the western shore of the bay in AA and Balt counties. This is the kind of day that low level helicity can jump dramatically from the enhanced SE winds coming up the rivers. Kind of a theory of mine that started when the F1 went through the next street down in 2006.

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39N 77W? That's almost right over DC. Pretty astounding if it comes to fruition, which it likely won't. #stupidNAM

 

Re Today: Watch the first 10 miles of the western shore of the bay in AA and Balt counties. This is the kind of day that low level helicity can jump dramatically from the enhanced SE winds coming up the rivers. Kind of a theory of mine that started when the F1 went through the next street down in 2006.

 

nam pretty ideal for thurs.. maybe a smidge fast as the profile has westerly winds by 0z tho i guess most of our tornado events are mid afternoon around here.  has a nice lee low etc.  hard to trust tho i think that period (wed-thur) is our best shot this year if it holds as it looks on the models. 

 

wed might stay capped during the day but if you get something to go could be a structure day at the least.  sfc winds need some work but there might be some local backing near the pseudo warm front. 

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nam pretty ideal for thurs.. maybe a smidge fast as the profile has westerly winds by 0z tho i guess most of our tornado events are mid afternoon around here.  has a nice lee low etc.  hard to trust tho i think that period (wed-thur) is our best shot this year if it holds as it looks on the models. 

 

wed might stay capped during the day but if you get something to go could be a structure day at the least.  sfc winds need some work but there might be some local backing near the pseudo warm front.

I am excited...about as much as we can hope for this far out.

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I'll take the GFS over NAM.

 

In setups like this NAM does tend to underestimate the CAPE with the clouds+rain hanging around (unless all-day clouds and rain verifies). In this case, GFS should definitely get the lean around DC and south. Perhaps more of a blend the further north you go where the more persistent rain is. A look at the SPC mesoanaylsis shows 2000-2500 SFC CAPE already in eastern VA, so the NAM's certainly off in that area.

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In setups like this NAM does tend to underestimate the CAPE with the clouds+rain hanging around (unless all-day clouds and rain verifies). In this case, GFS should definitely get the lean around DC and south. Perhaps more of a blend the further north you go where the more persistent rain is. A look at the SPC mesoanaylsis shows 2000-2500 SFC CAPE already in eastern VA, so the NAM's certainly off in that area.

Seems that way... SPC meso has 1500 SBCAPE just east of I-81 corridor with 2000 SBCAPE nosing in to DC area... along with 1000 MLCAPE

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Re Today: Watch the first 10 miles of the western shore of the bay in AA and Balt counties. This is the kind of day that low level helicity can jump dramatically from the enhanced SE winds coming up the rivers. Kind of a theory of mine that started when the F1 went through the next street down in 2006.

 

Noted..  Thanks. :yikes:

 

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