WATCHES: Tornado Watch Number 399

WWUS20 KWNS 310812
SEL9
SPC WW 310812
MDZ000-OHZ000-PAZ000-WVZ000-311500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 399
NWS STORM PREDICTION CENTER NORMAN OK
410 AM EDT SAT MAY 31 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

FAR WESTERN MARYLAND
CENTRAL AND EASTERN OHIO
WESTERN PENNSYLVANIA
NORTHERN WEST VIRGINIA

EFFECTIVE THIS SATURDAY MORNING FROM 410 AM UNTIL 1100 AM EDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST OF COLUMBUS
OHIO TO 5 MILES NORTH OF LATROBE PENNSYLVANIA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU9).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 398...

DISCUSSION...BROKEN AREA OF TSTMS WITH EMBEDDED MESO-BETA SCALE
CIRCULATIONS EXPECTED TO PERSIST AND SHIFT E ACROSS OH/WRN PA LATER
THIS MORNING AS REGION IS GLANCED BY PHASING MID LEVEL SPEED MAXIMA.
SBCAPE IS WEAK. BUT GIVEN CONFLUENT...INCREASINGLY MOIST WSWLY SFC
FLOW... AND UPSLOPE COMPONENT...SETUP MAY SUPPORT ADDITION EMBEDDED
ROTATING STRUCTURES. THESE MAY OCCASIONALLY STRENGTHEN AND PRODUCE
ISOLD TORNADOES GIVEN 50-60 KT WLY FLOW IN THE 700-500 MB LAYER.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 27040.

...CORFIDI

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