MESO: Mesoscale Discussion 1948

ACUS11 KWNS 212155
SWOMCD
SPC MCD 212155 COR
MEZ000-MAZ000-NHZ000-RIZ000-CTZ000-NYZ000-VTZ000-NJZ000-PAZ000-DEZ000-MDZ000-212315-

MESOSCALE DISCUSSION 1948
NWS STORM PREDICTION CENTER NORMAN OK
0455 PM CDT FRI AUG 21 2009

AREAS AFFECTED...NEW ENGLAND AND THE MID-ATLANTIC

CONCERNING...TORNADO WATCH 729...

VALID 212155Z - 212315Z

CORRECTED TO CHANGE MA TO MAINE 3RD PARAGRAPH

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 729 CONTINUES.

ISOLATED WIND DAMAGE AND HAIL WILL BE POSSIBLE ACROSS WW 729. THE
SEVERE THREAT WILL BE MARGINAL ACROSS WW 726 AND WW 727. WW 729 HAS
BEEN LOCALLY EXTENDED ACROSS PARTS OF MAINE. A SMALL WATCH MAY BE
NEEDED IN ERN MA AND RI LATER THIS EVENING.

A CONVECTIVE LINE ONGOING FROM WRN ME SWD INTO THE NEW YORK CITY
AREA WILL CONTINUE EWD ACROSS THE REMAINDER OF SRN NEW ENGLAND. THE
AIRMASS ACROSS ERN MA...ERN CT AND RI IS MODERATELY UNSTABLE
ACCORDING TO THE RUC AND VERTICAL SHEAR WILL INCREASE AS A 50-70 KT
MID-LEVEL JET SHIFTS EWD ACROSS SRN NEW ENGLAND LATE THIS AFTERNOON.
THESE FACTORS SHOULD SUSTAIN THE LINE EWD OFF THE COAST EARLY THIS
EVENING. ISOLATED DAMAGING WIND GUSTS AND HAIL WILL BE POSSIBLE WITH
THE STRONGER CELL ELEMENTS IN THE LINE.

FURTHER NORTH ACROSS ERN MAINE...MODERATE VERTICAL SHEAR IS ALREADY
IN PLACE ACCORDING TO THE PORTLAND ME WSR88D-VWP AND STRONG
INSTABILITY IS PRESENT FROM THE NEARBY COASTAL WATERS EXTENDING
INLAND ACROSS THE SRN HALF OF ME. THIS COMBINED WITH INCREASING
LOW-LEVEL FLOW MAY RESULT IN AN INCREASE IN THE WIND DAMAGE THREAT
THROUGH EARLY EVENING.

..BROYLES.. 08/21/2009

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

ATTN...WFO...CAR...GYX...BOX...OKX...ALY...PHI...

LAT...LON 38547514 38677568 39187593 39747546 40727451 41347383
42147348 43107256 43727166 44287127 44867106 45437077
46427035 46976983 47186936 47136877 46906830 46446814
45806807 45166822 44536850 44046916 43776999 43417055
42997081 42447083 42027064 41667060 41337100 41277172
41107223 40817277 40487335 40047385 39367435 38897481
38597498 38547514

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