746
WWUS20 KWNS 131045
SEL1
SPC WW 131045
IAZ000-131600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 581
NWS STORM PREDICTION CENTER NORMAN OK
545 AM CDT THU AUG 13 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND EASTERN IOWA
* EFFECTIVE THIS THURSDAY MORNING FROM 545 AM UNTIL 1100 AM CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
TO 75 MPH POSSIBLE
ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...A BOW ECHO WILL CONTINUE EAST ACROSS CENTRAL INTO EASTERN
IOWA THIS MORNING. SCATTERED SEVERE GUSTS PRIMARILY IN THE 60 TO 75
MPH RANGE WILL BE THE PRIMARY HAZARD. A BRIEF TORNADO OR LOCALIZED
CORRIDOR OF MORE SUBSTANTIAL GUSTS WILL BE POSSIBLE WITH ANY
STRONGER MESOVORTEX EMBEDDED WITHIN THE SQUALL LINE.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST
OF DES MOINES IA TO 45 MILES SOUTHEAST OF CEDAR RAPIDS IA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
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 580...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A FEW
CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR
27045.
...SMITH
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