SEL9
SPC WW 020201
NDZ000-020900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 789
NWS STORM PREDICTION CENTER NORMAN OK
900 PM CDT FRI AUG 1 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN NORTH DAKOTA
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 900 PM
UNTIL 400 AM CDT.
HAIL TO 2 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST OF
BISMARCK NORTH DAKOTA TO 50 MILES NORTH OF MINOT NORTH DAKOTA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).
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 788...
DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE OVERNIGHT
WITHIN WAA REGIME ALONG NOSE OF STRENGTHENING...NOCTURNAL LLJ. THE
COMBINATION OF STEEP LAPSE RATES...MODERATE CONVECTIVE INSTABILITY
AND 40-50 KT OF EFFECTIVE BULK SHEAR SUGGEST THE POTENTIAL FOR
SUPERCELLS AND/OR BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND
LARGE HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29025.
...MEAD/CORFIDI
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