

327 

WWUS20 KWNS 232009

SEL6

SPC WW 232009

MNZ000-WIZ000-LSZ000-240300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 206

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT SUN MAY 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST AND PARTS OF EAST-CENTRAL MINNESOTA

       NORTHWEST WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

1000 PM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST

NORTHEAST OF ELY MINNESOTA TO 20 MILES EAST SOUTHEAST OF SAINT

CLOUD MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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.



DISCUSSION...TSTMS ARE EXPECTED TO GRADUALLY INTENSIFY THIS

AFTERNOON ALONG STALLING SURFACE FRONT WHERE INFLOW AIR MASS HAS

BECOME MODERATELY TO STRONGLY UNSTABLE WITH MLCAPE OF 1500-3000

J/KG.  REGION WILL REMAIN ALONG THE ERN FRINGE OF STRONGER MID AND

HIGH-LEVEL WIND FIELD WITH 30-40 KT OF DEEP-LAYER SHEAR RESIDING

ALONG FRONTAL ZONE.  AS SUCH...AMBIENT ENVIRONMENT WILL BE

SUPPORTIVE OF ORGANIZED STORMS...INCLUDING SUPERCELLS WITH THE

PRIMARY HAZARDS BEING DAMAGING WIND GUSTS AND LARGE HAIL.



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 25030.





...MEAD

