

286 

WWUS20 KWNS 202336

SEL4

SPC WW 202336

IAZ000-ILZ000-210600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 194

NWS STORM PREDICTION CENTER NORMAN OK

635 PM CDT MON MAY 20 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN IOWA

  A SMALL PART OF WESTERN ILLINOIS



* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 635 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST

NORTHEAST OF WATERLOO IOWA TO 40 MILES SOUTH SOUTHWEST OF OTTUMWA

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 189...WW 190...WW

191...WW 192...WW 193...



DISCUSSION...TSTMS EXPECTED TO INCREASE ALONG SSW-NNE COLD FRONT

PROGRESSING SLOWLY E ACROSS CNTRL IA. OTHER STORMS MAY SPREAD NEWD

INTO SE IA/FAR WRN IL ON NRN FRINGE OF NE MO STORM CLUSTER. AMPLE

SHEAR WILL EXIST FOR SUSTAINED STORMS/SUPERCELLS POSING A RISK FOR

SVR HAIL AND HIGH WIND. A CONDITIONAL RISK ALSO WILL EXIST FOR

TORNADOES GIVEN 40+ KT 700 MB AND 50+ KT 500 MB FLOW...AND PARTS OF

THE WW MAY REQUIRE UPGRADE TO TORNADO IF  STORMS REMAIN MORE

DISCRETE THAN NOW EXPECTED .



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 22035.





...CORFIDI

