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June 1, 2012 - Severe Thunderstorms/Tornadoes Event


Kmlwx

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MESOSCALE DISCUSSION 1008

NWS STORM PREDICTION CENTER NORMAN OK

0249 PM CDT FRI JUN 01 2012

AREAS AFFECTED...SERN PA...ERN MD...ERN VA...D.C...NRN NC

CONCERNING...TORNADO WATCH 333...

VALID 011949Z - 012045Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 333 CONTINUES.

SUMMARY...TORNADO THREAT CONTINUES IN ASSOCIATION WITH ONGOING

SUPERCELL ACTIVITY.

DISCUSSION...NUMEROUS DISCRETE SUPERCELLS HAVE EVOLVED ACROSS THE

WARM SECTOR FROM PORTIONS OF NC...NWD INTO MD. THIS NRN ACTIVITY IS

COINCIDENT WITH ADVANCING WARM FRONT THAT NOW STRETCHES FROM BEDFORD

COUNTY PA...SEWD INTO CNTRL DE NEAR DOV. SEVERAL OF THE DISCRETE

SUPERCELLS HAVE EXHIBITED TORNADIC CHARACTERISTICS AS THEY LIFT NEWD

WITH ONE LONGER-LIVED UPDRAFT IN PARTICULAR NOW CROSSING THE WARM

FRONT OVER BALTIMORE COUNTY IN MD. NRN SUPERCELLS SHOULD ENCOUNTER

SOMEWHAT HIGHER LOW LEVEL HELICITY ALONG THE WARM FRONT WHICH MAY

ENHANCE THE TORNADIC POTENTIAL WHILE WITHIN THIS ZONE.

HIGHER THETA-E AIR MASS SHOULD GRADUALLY RETURN INTO SERN PA/DE AND

SWRN NJ OVER THE NEXT FEW HOURS. SUPERCELL ACTIVITY WILL INCREASE

AS THIS BOUNDARY ADVANCES NWD.

FRONTAL SQUALL LINE SHOULD APPROACH THE WRN-MOST PART OF WW 333 BY

00Z AND AN ENHANCED DAMAGING WIND THREAT MAY ENSUE WITH ASSOCIATED

CONVECTION.

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