SEL8
SPC WW 310625
SDZ000-311200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 778
NWS STORM PREDICTION CENTER NORMAN OK
125 AM CDT THU JUL 31 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTH CENTRAL INTO NORTHEAST SOUTH DAKOTA
EFFECTIVE THIS THURSDAY MORNING FROM 125 AM UNTIL 700 AM CDT.
HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHEAST OF
MOBRIDGE SOUTH DAKOTA TO 60 MILES WEST SOUTHWEST OF WATERTOWN
SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 777...
DISCUSSION...SMALL BOWING MCS/HP-SUPERCELL OVER S-CENTRAL ND EARLY
THIS MORNING IS EXPECTED TO CONTINUE SEWD ALONG PERIPHERY OF STRONG
CAPPING INVOF SURFACE FRONT OVERNIGHT INTO NRN/NERN SD. VERY STRONG
WINDS AND ISOLATED LARGE HAIL CAN BE EXPECTED WITH THIS ACTIVITY.
AS LLJ INCREASES AND BECOMES MORE SWLY TONIGHT...ELEVATED STORMS
WITH THREAT OF LARGE HAIL MAY ALSO PERSIST ATOP SURFACE COLD POOL IN
WAKE OF LEADING STORMS THROUGH DAY BREAK.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 31035.
...EVANS
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