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127 

WWUS20 KWNS 270753

SEL5

SPC WW 270753

IAZ000-271500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 225

NWS STORM PREDICTION CENTER NORMAN OK

250 AM CDT MON MAY 27 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND SOUTHERN IOWA



* EFFECTIVE THIS MONDAY MORNING FROM 250 AM UNTIL 1000 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES WEST

NORTHWEST OF FORT DODGE IOWA TO 20 MILES WEST OF LAMONI IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 224...



DISCUSSION...N-S SQLN IN FAR WRN IA EXPECTED TO CONTINUE E TO ESE

THROUGH LATER THIS MORNING. WHILE ACTIVITY WILL BECOME SLIGHTLY

ELEVATED WITH EWD EXTENT...DMX VWP AND AREA PRESSURE DATA SUGGEST

THAT COOL...STABLE...SFC-BASED LAYER IS VERY SHALLOW. COUPLED WITH

HIGH BUOYANCY PRESENT ABOVE THIS LAYER /PER 00Z OAX SOUNDING/...AND

CURRENT OAX VPW SAMPLING OF 60+ KT NWLY REAR-INFLOW JET IN THE 1-2

KM LAYER...POTENTIAL MAY EXIST FOR STRONG-SVR SFC GUSTS ACROSS PARTS

OF IA DESPITE COOL AIR AT SFC.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29030.





...CORFIDI

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