

998 

WWUS20 KWNS 190826

SEL9

SPC WW 190826

MNZ000-WIZ000-191300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 409

NWS STORM PREDICTION CENTER NORMAN OK

325 AM CDT TUE JUN 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL MINNESOTA

       WEST CENTRAL WISCONSIN



EFFECTIVE THIS TUESDAY MORNING FROM 325 AM UNTIL 800 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH

NORTHWEST OF MANKATO MINNESOTA TO 60 MILES EAST OF EAU CLAIRE

WISCONSIN.  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 408...



DISCUSSION...EARLIER SUPERCELL CLUSTER HAS EVOLVED INTO A MORE

LINEAR MCS WITH SOME BOWING CHARACTERISTICS IMMEDIATELY SW OF MSP.

THIS CONVECTION WILL LIKELY PERSIST FOR SEVERAL MORE HOURS AS IT

PROGRESSES GENERALLY EWD NEAR OR JUST N OF THE SURFACE WARM

FRONT...WITH A FEED OF STRONG INSTABILITY FROM THE S/SW ON A 35-45

KT LLJ.  BOTH DAMAGING WINDS AND LARGE HAIL CAN BE EXPECTED WITH

THIS MCS AS IT MOVES FROM E CENTRAL MN INTO W CENTRAL WI THROUGH

ABOUT 12-13Z.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 26035.





...THOMPSON

