SEL4
SPC WW 142233
NDZ000-SDZ000-150600-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 644
NWS STORM PREDICTION CENTER NORMAN OK
435 PM MDT THU JUL 14 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN NORTH DAKOTA
NORTHERN SOUTH DAKOTA
EFFECTIVE THIS THURSDAY AFTERNOON FROM 435 PM UNTIL MIDNIGHT MDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHWEST OF
BUFFALO SOUTH DAKOTA TO 85 MILES EAST NORTHEAST OF MOBRIDGE SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
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 642...WW 643...
DISCUSSION...THUNDERSTORMS ARE EXPECTED TO RAPIDLY DEVELOP OVER
NORTHWEST ND/SOUTHWEST SD AND TRACK EASTWARD ALONG A WARM FRONT
ACROSS THE WATCH AREA THIS EVENING. VERY HIGH CAPE AND AMPLE LOW
LEVEL MOISTURE...COUPLED WITH VEERING LOW LEVEL AND MODERATELY
STRONG MID LEVEL WINDS...WILL PROMOTE A RISK OF SPLITTING SUPERCELLS
CAPABLE OF VERY LARGE HAIL AND ISOLATED TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28030.
...HART
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