

835 

WWUS20 KWNS 202054

SEL1

SPC WW 202054

IAZ000-ILZ000-INZ000-WIZ000-LMZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 161

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT TUE MAY 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN IOWA

  NORTHERN ILLINOIS

  NORTHWEST INDIANA

  SOUTHERN WISCONSIN

  LAKE MICHIGAN



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

  1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL

    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHEAST

OF RACINE WISCONSIN TO 65 MILES WEST OF DES MOINES IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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 160...



DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INTENSIFY

ALONG A WEAK BOUNDARY EXTENDING FROM CENTRAL IA INTO SOUTHERN WI.

THESE STORMS WILL SPREAD EAST-SOUTHEASTWARD ACROSS THE WATCH AREA

THIS AFTERNOON AND EVENING.  MODERATE INSTABILITY COUPLED WITH STEEP

LAPSE RATES AND STRONG WINDS ALOFT WILL PROMOTE ORGANIZED MULTICELL

OR ISOLATED SUPERCELL STORMS CAPABLE OF LARGE HAIL.  DAMAGING WINDS

MAY BECOME AN INCREASING THREAT LATER THIS EVENING.



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 26030.





...HART

