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Week of June 10th Heavy Rain and Thunderstorms Discussion


IsentropicLift

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I agree that the SPC Moderate is probably too far south -- or at least the cutoff on the northern fringes is far too sharp. Also, new blue box for Central and Southern NJ with the weakening MCS.

I was suprised. I would of thought they would of trimmed down the northern extent of the slight risk but kept the mdt areas the same. GFS still gives PHL - CNJ some good cape with great LI.

What are your current thoughts?

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MESOSCALE DISCUSSION 1057

NWS STORM PREDICTION CENTER NORMAN OK

0710 AM CDT THU JUN 13 2013

AREAS AFFECTED...PORTIONS ERN PA...NJ...MD EXCEPT

PANHANDLE...CENTRAL/ERN WV...DC...DE...NRN/CENTRAL VA.

CONCERNING...SEVERE THUNDERSTORM WATCH 303...304...

VALID 131210Z - 131345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH

303...304...CONTINUES.

SUMMARY...CONTINUE WWS ALONG/AHEAD OF PRIMARY MCS...WHICH WAS

LOCATED AT 12Z FROM E-CENTRAL PA TO NEAR FDK THEN WSWWD TO S-CENTRAL

WV NEAR CRW. THIS ACTIVITY SHOULD MOVE GENERALLY ESEWD...OFFERING

OCNL GUSTS NEAR SVR LIMITS. MAIN HAZARD WILL REMAIN WIND

DAMAGE...ESPECIALLY INVOLVING TREES AND POWER LINES.

DISCUSSION...MOST WELL-ORGANIZED PART OF MCS WAS EVIDENT ASTRIDE

MD/PA BORDER...GENERALLY ALONG AND S OF SFC WARM-FRONTAL ZONE THAT

WAS ANALYZED ROUGHLY ACROSS PHL/ACY AREAS THEN SEWD OVER ATLC. WARM

FRONT SHOULD MOVE NWD IN ADVANCE OF THIS ACTIVITY...AND IS SHALLOW

ENOUGH FOR RISK OF STG/DAMAGING GUSTS TO REACH SFC WITHIN 50-75 NM

TO ITS N AS WELL. PRECONVECTIVE WARM SECTOR WILL REMAIN

CHARACTERIZED BY SFC DEW POINTS UPPER 60S TO MID 70S F...ACTING IN

TANDEM WITH POCKETS OF SFC DIABATIC HEATING TO INCREASE BUOYANCY.

MLCAPE JUST PRIOR TO TSTM ARRIVAL SHOULD RANGE FROM AROUND 1000 /KG

ALONG WARM FRONT TO 2500-3000 J/KG RANGE IN CENTRAL VA...ALONG N END

OF MODIFIED EML EVIDENT IN 12Z RNK RAOB THAT WILL STEEPEN LAPSE

RATES WITH SWD EXTENT. DEEP SHEAR WILL REMAIN MAXIMIZED N OF VA/NC

BORDER...WITH 45-55 KT EFFECTIVE SHEAR MAGNITUDES FROM WARM FRONT TO

N-CENTRAL VA. ALTHOUGH SVR THREAT FROM PRIMARY MCS CURRENTLY

DIMINISHES WITH WWD EXTENT INTO WV...RISK MAY INCREASE AGAIN FROM

TWO PERSPECTIVES...

1. RE-INTENSIFICATION OF ACTIVITY MOVING FROM CENTRAL/SRN WV EWD

INTO WRN/CENTRAL VA...AND INTO DESTABILIZING AIR MASS.

2. UPSHEAR CONVECTION BECOMING BETTER ORGANIZED ACROSS SERN INDIANA

AND MOVING ESEWD ALONG OUTFLOW BOUNDARY FROM INITIAL MCS. FOR MORE

DETAILS ON THIS SCENARIO...REF SPC MESOSCALE DISCUSSION 1058

FORTHCOMING.

..EDWARDS.. 06/13/2013

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It's not handling the southern extent of the MCS well:

 

 

 

Good point, also just looking at the radar and satellite it looks like the MCS should clear the area by noon or so. I really think we can get some sun behind it. It is already clearing out in western PA and NY.

(- the shield is much more north than on the sim in that area)

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