

000 

WWUS20 KWNS 230702

SEL3

SPC WW 230702

MTZ000-NDZ000-231500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 733

NWS STORM PREDICTION CENTER NORMAN OK

100 AM MDT WED JUL 23 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN MONTANA

       WESTERN AND NORTHERN NORTH DAKOTA



EFFECTIVE THIS WEDNESDAY MORNING FROM 100 AM UNTIL 900 AM MDT.



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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHEAST OF WILLISTON NORTH DAKOTA TO 20 MILES EAST SOUTHEAST OF

BAKER MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 732...



DISCUSSION...SCTD STRONG/SVR TSTM CLUSTERS NOW IN ERN MT EXPECTED TO

MOVE/DEVELOP NEWD THROUGH LATER THIS MORNING...WITH ADDITIONAL

STORMS POSSIBLE LATER THIS MORNING FARTHER E IN SUSTAINED WAA AREA

OVER WRN ND.  DESPITE UNFAVORABLE TIME OF DAY AND SLIGHTLY ELEVATED

NATURE OF CONVECTION...POTENTIAL MAY PERSIST/DEVELOP FOR ISOLD DMGG

WIND GUSTS AND SVR HAIL GIVEN STRENGTH OF CLOUD LAYER SHEAR...AND

INCREASING LARGE SCALE ASCENT ASSOCIATED WITH APPROACHING WRN MT

SHORTWAVE TROUGH.



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 500. MEAN STORM

MOTION VECTOR 23030.





...CORFIDI

