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349 

WWUS20 KWNS 150138

SEL2

SPC WW 150138

IAZ000-ILZ000-150600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 172

NWS STORM PREDICTION CENTER NORMAN OK

840 PM CDT SAT APR 14 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST IOWA

       NORTHWEST ILLINOIS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 840 PM

UNTIL 100 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF

MOLINE ILLINOIS TO 70 MILES WEST NORTHWEST OF BURLINGTON IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 167...WW 169...WW

170...WW 171...



DISCUSSION...BOW ECHO OVER CNTRL IA WILL CONTINUE EWD AT 40-50 KT

WITHIN TERMINUS OF 50-60 KT LLJ.  DAMAGING WINDS AND SEVERE HAIL

WILL BE POSSIBLE WITH THIS SYSTEM BEFORE IT BEGINS TO WEAKEN NEAR OR

JUST E OF THE MS RIVER.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM

MOTION VECTOR 27040.





...MEAD

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