

157 

WWUS20 KWNS 210050

SEL6

SPC WW 210050

IAZ000-ILZ000-MNZ000-WIZ000-LMZ000-210800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 196

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT MON MAY 20 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EAST-CENTRAL AND NORTHEAST IOWA

  NORTHERN ILLINOIS

  FAR SOUTHEAST MINNESOTA

  WEST-CENTRAL AND SOUTHERN WISCONSIN

  LAKE MICHIGAN



* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 750 PM

  UNTIL 300 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

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

SOUTHWEST OF LA CROSSE WISCONSIN TO 40 MILES EAST NORTHEAST OF

MARSEILLES ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 190...WW 191...WW

192...WW 193...WW 194...WW 195...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE WATCH AREA LATE THIS EVENING INTO TONIGHT AS

THE REGION IS INFLUENCED BY A MIDLEVEL VORTICITY MAXIMUM PROGRESSING

THROUGH THE LOWER-MO VALLEY.  00Z REGIONAL SOUNDINGS INDICATE THE

PRESENCE OF A MODERATELY UNSTABLE AIR MASS WHICH WHEN COUPLED WITH A

STRENGTHENING DEEP-LAYER WIND FIELD WILL PROMOTE ORGANIZED STORM

STRUCTURES CAPABLE OF DAMAGING WINDS AND LARGE HAIL.



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 24035.





...MEAD

