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000 

WWUS20 KWNS 030505

SEL0

SPC WW 030505

MTZ000-NDZ000-SDZ000-031300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 800

NWS STORM PREDICTION CENTER NORMAN OK

1105 PM MDT SAT AUG 2 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN MONTANA

       WESTERN AND CENTRAL NORTH DAKOTA

       NORTHWEST SOUTH DAKOTA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1105 PM

UNTIL 700 AM MDT.



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 90

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTHWEST OF

BROADUS MONTANA TO 90 MILES NORTHEAST OF BISMARCK NORTH DAKOTA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 798...WW 799...



DISCUSSION...TSTMS NOW IN ERN MT AND NW SD EXPECTED TO INCREASE IN

COVERAGE AND STRENGTH OVERNIGHT AS IMPULSES IN CNTRL MT AND NRN WY

CONTINUE FAIRLY RAPIDLY ENEWD.  STRENGTH OF MEAN WSWLY WIND FIELD

AND INCREASING MOISTURE AVAILABILITY WITH EWD EXTENT SUGGEST

POTENTIAL FOR SUSTAINED STORMS/CLUSTERS AND POSSIBLE SUPERCELLS WITH

HIGH WIND AND 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 25040.





...CORFIDI

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