

785 

WWUS20 KWNS 222338

SEL4

SPC WW 222338

IAZ000-230500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 434

NWS STORM PREDICTION CENTER NORMAN OK

640 PM CDT MON JUL 22 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EAST CENTRAL IOWA



* EFFECTIVE THIS MONDAY NIGHT FROM 640 PM UNTIL MIDNIGHT 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 25

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

CEDAR RAPIDS IOWA TO 30 MILES SOUTH SOUTHWEST OF CEDAR RAPIDS

IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 429...WW 430...WW

431...WW 432...WW 433...



DISCUSSION...LARGE CLUSTER OF INTENSE THUNDERSTORMS OVER CENTRAL IA

MAY PERSIST FOR A FEW MORE HOURS AND SPREAD EASTWARD INTO WATCH

AREA.  LARGE CAPE VALUES AND INCREASING MESOSCALE ORGANIZATION COULD

RESULT IN A PERIOD OF ENHANCED WIND THREAT...ALONG WITH HAIL IN THE

STRONGEST STORMS.



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 29025.





...HART

