MESO: Mesoscale Discussion 1356

ACUS11 KWNS 272038
SWOMCD
SPC MCD 272038
MAZ000-NHZ000-RIZ000-272145-

MESOSCALE DISCUSSION 1356
NWS STORM PREDICTION CENTER NORMAN OK
0338 PM CDT SAT JUN 27 2009

AREAS AFFECTED...ERN MASSACHUSETTS AND RHODE ISLAND

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 272038Z - 272145Z

...ISOLATED SEVERE STORMS POSSIBLE ACROSS ERN MA AND RI DURING THE
NEXT COUPLE OF HOURS...BUT THREAT IS EXPECTED TO BE TOO SHORT LIVED
AND SMALL COVERAGE FOR A WW ISSUANCE.

COLD UPPER LOW WAS CENTERED NEAR THE MA/NY BORDER. ON THE FAR ERN
SIDE OF THE SYSTEM...AROUND 30 KT OF DEEP LAYER SHEAR WAS LOCATED
OVER ERN MA AND RI. WITHIN THIS DEEPER SHEAR...A COASTAL FRONT HAD
MOVED INLAND WITH DEWPOINTS INCREASING INTO THE MID 60S. THE
COMBINATION OF LARGE SCALE LIFTING...INCREASED SHEAR AND A MORE
MOIST BOUNDARY LAYER RESULTED IN ISOLATED SEVERE STORMS TO DEVELOP.
AS THE COASTAL FRONT MOVES TO THE WEST AND FURTHER INLAND...NEW
STORMS THAT FORM WILL BE IN WEAKER DEEP LAYER SHEAR...WHICH SHOULD
DIMINISH THE POTENTIAL FOR SEVERE STORMS DEVELOPING.

..IMY.. 06/27/2009

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...GYX...BOX...

LAT...LON 41647093 41437136 41477176 42097177 42867148 42827096
41647093

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