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August Discussion


TauntonBlizzard2013

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Looks like models today get the warm front near the Pike. Wed could be fun . Heavy rains from Berks on N and severe threat south and east

Yeah ticked NW. I guess the two red flags I see is the lack of low level CAPE, and mid level winds lacking a bit. Most of our high shear/low CAPE events did not feature such strong E-SE winds. Will that advect marine air in just enough to taint low levels? Maybe...maybe not. Of course low level shear is very strong and LCLs are low...but I'd like to see a tad more CAPE in the lower levels. 

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Yeah ticked NW. I guess the two red flags I see is the lack of low level CAPE, and mid level winds lacking a bit. Most of our high shear/low CAPE events did not feature such strong E-SE winds. Will that advect marine air in just enough to taint low levels? Maybe...maybe not. Of course low level shear is very strong and LCLs are low...but I'd like to see a tad more CAPE in the lower levels.

Seems like as they continue to bump north hopefully the CApe comes with it. I personally don't think they're done coming north
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PVD > BOS > Just offshore Portland ME.

 

Plenty of cape around most of sne that run at least. These surface lows that tend to run overhead offer the strongest storms along both sides and along the warm front correct?

 

This may not have much near any cold front, but could feature a lot of heavy rain near and north of the warm front. Tons of low level shear for sure..just a matter of not having too much easterly flow. Would rather more SE.

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Dangerous

THIS APPEARS TO BE A CLASSIC SETUP FOR A POSSIBLE TORNADO

SOMEWHERE IN SOUTHERN NEW ENGLAND. OF COURSE THIS IS EXTREMELY

HARD TO PREDICT 4 DAYS IN ADVANCE. HOWEVER...ALL MODELS INDICATE

VERY HIGH HELICITY VALUES...WITH 0-1 KM VALUES OF 200-300 AND

0-3 KM VALUES OF 300-500. THESE ARE ASSOCIATED WITH THE WARM

ADVECTION AND PRECEDE THE INSTABILITY AXIS. THE ECMWF SHOWS THAT

IN EASTERN MA BETWEEN 18Z AND 00Z...THE CAPE INCREASES TO 500-800

J/KG WHILE THERE STILL REMAINS HELICITY IN THE 100-200 RANGE. THE

GFS IS EARLIER AND WOULD IMPLY A MORNING TORNADIC THREAT WITH

HIGHLY CURVED HODOGRAPHS AND HELICITY VALUES EXCEEDING 500.

EXPERIENCE HAS SHOWN THAT THE TORNADO THREAT IS MAXIMIZED ON THE

TRAILING END OF THE HELICITY MAX...WHERE THE GRADIENT IS TIGHTEST

AND WHERE THE INSTABILITY IS INCREASING. THIS WILL BE LOW-TOPPED

CONVECTION WITH LOW LCLS AND A LOW CAPE...HIGH SHEAR ENVIRONMENT.

ANY CONVECTIVE CELLS WITHIN THE HEAVY RAIN AREA WILL NEED TO BE

WATCHED CLOSELY.

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