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922 

WWUS20 KWNS 191953

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SPC WW 191953

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 484

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT MON SEP 19 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  PARTS OF EAST CENTRAL AND SOUTHEAST IOWA

  EXTREME NORTHWEST ILLINOIS



* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  A COUPLE TORNADOES POSSIBLE

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5

    INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



SUMMARY...THUNDERSTORM DEVELOPMENT IS EXPECTED SOON ALONG A COLD

FRONT MOVING SOUTHEASTWARD ACROSS CENTRAL IOWA.  THE STORM

ENVIRONMENT HAS BECOME FAVORABLE FOR SUPERCELLS AND STORMS ARE

EXPECTED TO MAINTAIN SOME DISCRETE CHARACTER THROUGH MUCH OF THE

AFTERNOON/EVENING.  A COUPLE OF TORNADOES AND ISOLATED VERY LARGE

HAIL WILL BE THE MAIN RISKS...ALONG WITH ISOLATED DAMAGING GUSTS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH NORTHWEST OF

KNOXVILLE IOWA TO 20 MILES NORTH OF MOLINE ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 483...



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 31025.





...THOMPSON

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