

956 

WWUS20 KWNS 270310

SEL3

SPC WW 270310

MNZ000-271100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 693

NWS STORM PREDICTION CENTER NORMAN OK

1005 PM CDT TUE JUL 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN MINNESOTA



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1005 PM

UNTIL 600 AM 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTHWEST OF

SAINT CLOUD MINNESOTA TO 20 MILES WEST SOUTHWEST OF MANKATO

MINNESOTA.  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 689...WW 690...WW

691...WW 692...



DISCUSSION...A LARGE HP SUPERCELL HAS RECENTLY MORPHED INTO A

CYCLONIC GYRE WITHIN THE PAST HOUR OVER FAR NERN SD.  UPSCALE GROWTH

INTO A LARGER CONVECTIVE SYSTEM APPEARS PROBABLE AS THE GYRE MERGES

WITH DECAYING BOW OVER E-CNTRL SD.  EXPECT MCS TO CONTINUE EWD ALONG

IMMEDIATE COOL SIDE OF WARM FRONT...FORCED BY STRENGTHENING

LOW-LEVEL WAA REGIME ATTENDANT TO NOCTURNAL LLJ.  DAMAGING WINDS

WILL REMAIN THE PRIMARY HAZARD WITH THESE 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 500. MEAN STORM

MOTION VECTOR 27030.





...MEAD

