

703 

WWUS20 KWNS 222004

SEL2

SPC WW 222004

NDZ000-230200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 492

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT MON JUN 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN INTO CENTRAL NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 305 PM UNTIL 900

PM CDT.



HAIL TO 1.5 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF

MINOT NORTH DAKOTA TO 60 MILES SOUTH SOUTHEAST OF DICKINSON NORTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 490...WW 491...



DISCUSSION...THUNDERSTORMS ARE EXPECTED TO CONTINUE INCREASING LATE

TODAY AND THIS EVENING ACROSS WW AHEAD OF STRONG SHORTWAVE TROUGH

AND ASSOCIATED SURFACE COLD FRONT MOVING OUT OF THE NRN ROCKIES.

INSTABILITY WILL REMAIN MODEST ACROSS THE REGION...ALTHOUGH DEEP

LAYER SHEAR WILL CONTINUE TO INCREASE INVOF 50 KT SWLY MID LEVEL JET

THROUGH THE EVENING.  THIS SHOULD SUPPORT A THREAT OF ORGANIZED

CLUSTERS/SUPERCELLS WITH LARGE HAIL AND DAMAGING WINDS FROM THE

STRONGER STORMS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM

MOTION VECTOR 24020.





...EVANS

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