

265 

WWUS20 KWNS 130241

SEL2

SPC WW 130241

IAZ000-ILZ000-WIZ000-LMZ000-131000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 72

NWS STORM PREDICTION CENTER NORMAN OK

940 PM CDT SAT APR 12 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WEST-CENTRAL THROUGH EASTERN IOWA

  EXTREME NORTHERN ILLINOIS

  SOUTHERN WISCONSIN

  LAKE MICHIGAN



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 940 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS

    TO 2 INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH OF

STORM LAKE IOWA TO 20 MILES NORTH NORTHEAST OF MILWAUKEE

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 70. WATCH NUMBER 70 WILL NOT BE

IN EFFECT AFTER 940 PM CDT. CONTINUE...WW 71...



DISCUSSION...WW 70 IS BEING REPLACED DUE TO CONTINUATION OF SEVERE

HAIL/WIND THREAT INTO OVERNIGHT HOURS.  SCATTERED-NUMEROUS TSTMS

ACROSS WRN/NRN PORTIONS OF NEW WW AREA...INCLUDING A FEW

SUPERCELLS...WILL PRODUCE LARGE HAIL INVOF PERSISTENT LOW-LEVEL

BAROCLINIC ZONE.  THIS ACTIVITY MAY AGGREGATE UPSCALE INTO

BETTER-ORGANIZED MCS...IN WHICH CASE DAMAGING-WIND THREAT WOULD

INCREASE EWD ACROSS IA...SRN WI...AND NRN IL.  SEE SPC MESOSCALE

DISCUSSION 329 FOR MORE INITIAL DETAILS.



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 500. MEAN STORM

MOTION VECTOR 27030.





...EDWARDS

