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September 17-19 2012 rain and severe weather potential


SNO

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1300 disco

VERTICAL SHEAR PROFILES WILL BE QUITE STRONG OVER THE ENTIRE RISK

AREA. BOWING LINE SEGMENTS AND EMBEDDED SUPERCELL STRUCTURES WILL

POSE A RISK OF DAMAGING WINDS AND ISOLATED TORNADOES THROUGH THE

AFTERNOON. THE MOST LIKELY AREA OF SURFACE-BASED CONVECTION AND

STRONG LOW LEVEL VERTICAL SHEAR APPEARS TO BE ALONG A CORRIDOR

INCLUDING THE DC-BWI-PHL-NYC AREAS. HERE...EFFECTIVE HELICITY

VALUES OF 200-300 M2/S2 FAVORS THE RISK OF A FEW TORNADOES. DUE TO

WEAK INSTABILITY WILL MAINTAIN SLIGHT RISK DESIGNATION.

NEVERTHELESS...THE AFOREMENTIONED CORRIDOR WILL BE MONITORED FOR

TRENDS SUGGESTING A GREATER RISK OF DISCRETE SUPERCELLS AND THE

POTENTIAL FOR AN UPGRADE TO MODERATE RISK.

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12Z OBSERVED SOUNDINGS FROM

WASHINGTON-DULLES AND GREENVILLE-SPARTANBURG SC ARE ALREADY

INDICATIVE OF 500-800 J/KG MLCAPE WITH VIRTUALLY NIL CONVECTIVE

INHIBITION...ALONG WITH A HIGHLY SHEARED/RICH LOW-LEVEL SRH

ENVIRONMENT INCLUDING 0-1 KM SRH OF 250-300 M2/S2

From the disco of the MD Kenny posted above -- I wasnt expecting much MLCAPE at all

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