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WWUS20 KWNS 151139

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SPC WW 151139

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 647

NWS STORM PREDICTION CENTER NORMAN OK

640 AM CDT FRI JUL 15 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL MINNESOTA



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 640 AM UNTIL 100

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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHWEST OF ALEXANDRIA MINNESOTA TO 40 MILES NORTH NORTHEAST OF

MINNEAPOLIS MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 646...



DISCUSSION...ELEVATED TSTMS /INCLUDING SUPERCELLS/ ARE DEVELOPING

ACROSS CNTRL MN THIS MORNING IN RESPONSE TO INCREASED WAA/ISENTROPIC

ASCENT ALONG EXIT REGION OF VEERING NOCTURNAL LLJ.  INFLOW SOURCE

REGION ACROSS ERN SD IS CHARACTERIZED BY A VERY MOIST BOUNDARY LAYER

AND STEEP MIDLEVEL LAPSE RATES WITH MUCAPE UPWARDS OF 2000-3000+

J/KG BASED ON OBJECTIVE GUIDANCE.  WHILE LARGE HAIL WILL BE THE

PRIMARY HAZARD...LOCALLY DAMAGING WIND GUSTS WILL ALSO BE POSSIBLE.



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 550. MEAN STORM

MOTION VECTOR 29030.





...MEAD

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