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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 409

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT THU JUN 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN MINNESOTA

       NORTHERN AND EASTERN NORTH DAKOTA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

1000 PM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH OF

DULUTH MINNESOTA TO 15 MILES NORTH NORTHWEST OF DEVILS LAKE NORTH

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 404...WW 405...WW

406...WW 407...WW 408...



DISCUSSION...WAA TSTMS EXPECTED TO BECOME STRONGER AND MORE NEARLY

SFC-BASED LATER THIS AFTN AS WAA PRESISTS AND POSSIBLY ATOP SHALLOW

WNW-ESE FRONTAL ZONE.  ASCENT ALSO MAY BE ENHANCED BY DIRECT

CIRCULATION ASSOCIATED WITH ENTRANCE REGION OF UPR JET STREAK IN WRN

ONT.  DEEP SHEAR WILL REMAIN MODEST...BUT WITH A SUBSTANTIAL

DIRECTIONAL COMPONENT.  AND...MOISTURE...WHILE NOT PARTICULARLY

RICH...WILL BE ADEQUATE FOR SUSTAINED STORMS.  OVERLL SETUP

THEREFORE APAPERAS SUPPORTIVE OF A FEW STORMS/POSSIBLE SUPERCELLS

WITH LARGE HAIL AND LOCALLY DMGG WIND.



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 29030.





...CORFIDI

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