

417 

WWUS20 KWNS 181850

SEL5

SPC WW 181850

MNZ000-NDZ000-SDZ000-190200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 465

NWS STORM PREDICTION CENTER NORMAN OK

150 PM CDT THU JUN 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND WESTERN MINNESOTA

       PARTS OF SOUTHERN NORTH DAKOTA

       PARTS OF NORTHERN AND EASTERN SOUTH DAKOTA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

900 PM CDT.



HAIL TO 2.5 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES EAST OF

BRAINERD MINNESOTA TO 45 MILES WEST SOUTHWEST OF MOBRIDGE SOUTH

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 461...WW 462...WW

463...WW 464...



DISCUSSION...AS AIR MASS CONTINUES TO DESTABILIZE THUNDERSTORMS WILL

INCREASE IN NUMBER AND INTENSITY ACROSS THE WATCH AREA THRU THE

AFTERNOON.  WITH MLCAPES AOA 2500...STEEP LAPSE RATES AND FAVORABLE

SHEAR ENVIRONMENT...SUPERCELLS ARE LIKELY.  LARGE HAIL AND DAMAGING

WINDS WILL BE ASSOCIATED WITH ANY SUPERCELL ALONG WITH POSSIBLE

BRIEF TORNADOES.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 23025.





...HALES

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