WATCHES: Severe Thunderstorm Watch Number 738

WWUS20 KWNS 110028
SEL8
SPC WW 110028
NDZ000-110700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 738
NWS STORM PREDICTION CENTER NORMAN OK
730 PM CDT THU SEP 10 2009

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

CENTRAL INTO NORTHEASTERN NORTH DAKOTA

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 730 PM
UNTIL 200 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 60 MILES SOUTH OF
BISMARCK NORTH DAKOTA TO 65 MILES NORTH NORTHEAST OF DEVILS LAKE
NORTH 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.

DISCUSSION...VERY STRONG UPPER LEVEL SYSTEM DIGGING ACROSS THE NRN
HIGH PLAINS WILL FOCUS INCREASING THUNDERSTORMS OVER CENTRAL ND THIS
EVENING/OVERNIGHT. 00Z SOUNDINGS INDICATE STEEP MID LEVEL LAPSE
RATES WITH SUFFICIENT INFLUX OF LOW LEVEL MOISTURE TO SUSTAIN
MODERATE MUCAPE OVERNIGHT. LOW LEVEL SHEAR REMAINS WEAK...HOWEVER
SUFFICIENT DEEP LAYER SHEAR WILL REMAIN IN PLACE FOR ORGANIZATION
INTO CLUSTERS/LINES AND PERHAPS A FEW SUPERCELLS. LARGE HAIL AND
HEAVY RAIN WILL BE PRIMARY THREATS...ALTHOUGH ISOLATED DAMAGING
WINDS REMAIN POSSIBLE.

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 26020.

...EVANS

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