watch

[Perry Lester]

THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHERN IOWA A SMALL PART OF WEST CENTRAL AND NORTHWEST ILLINOIS EXTREME NORTHEAST MISSOURI EAST CENTRAL NEBRASKA * EFFECTIVE THIS TUESDAY NIGHT FROM 655 PM UNTIL MIDNIGHT CDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH OF COLUMBUS NEBRASKA TO 35 MILES NORTH NORTHEAST OF BURLINGTON IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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.DISCUSSION...WIDELY SCATTERED STORMS SHOULD INTENSIFY SOME IN THE NEXT COUPLE OF HOURS FROM ERN NEB EWD ACROSS SRN IA...IN A ZONE OF MODERATE-STRONG INSTABILITY AND SUFFICIENT DEEP-LAYER WIND SHEAR FOR ORGANIZED/SUPERCELL STORMS. A FEW DAMAGING WIND AND LARGE HAIL EVENTS ARE THE MAIN CONCERNS FOR THE NEXT FEW HOURS...BEFORE THE SURFACE LAYER BEGINS TO COOL AND SLOWLY STABILIZE. 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 550. MEAN STORM MOTION VECTOR 31025. ...THOMPSON. IOWA COUNTIES INCLUDED ARE ADAIR ADAMS APPANOOSE AUDUBON CASS CEDAR CLARKE DALLAS DAVIS DECATUR DES MOINES FREMONT GUTHRIE HARRISON HENRY IOWA JASPER JEFFERSON JOHNSON KEOKUK LEE LOUISA LUCAS MADISON MAHASKA MARION MILLS MONROE MONTGOMERY MUSCATINE PAGE POLK POTTAWATTAMIE POWESHIEK RINGGOLD SCOTT SHELBY TAYLOR UNION VAN BUREN WAPELLO WARREN WASHINGTON WAYNE . ILLINOIS COUNTIES INCLUDED ARE HANCOCK HENDERSON MCDONOUGH MERCER ROCK ISLAND WARREN . MISSOURI COUNTIES INCLUDED ARE CLARK SCOTLAND