Severe Thunderstorm Watch (Iowa, Minnesota, Wisconsin)

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URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 466
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CDT MON AUG 18 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND EASTERN IOWA
SOUTHEASTERN MINNESOTA
WESTERN AND SOUTHERN WISCONSIN

* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 745 PM
UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE…
ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF LA CROSSE WISCONSIN TO 30 MILES WEST SOUTHWEST OF
WATERLOO 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…TSTMS EXPECTED TO PERSIST AND POSSIBLE INCREASE THROUGH
LATE EVE AHEAD OF SHORTWAVE TROUGH PIVOTING SE ACROSS REGION IN
CYCLONIC WNWLY MID/UPR LVL FLOW /REF MCD 1577/. STORMS MAY FOCUS IN
TWO AREAS…/1/ ALONG/AHEAD OF WEAK COLD FRONT NOW ENTERING SW MN
AND FAR NW IA…AND /2/ ALONG SW-NE LOW-LVL CONFLUENCE AXIS OVER NE
IA/SW WI. AMPLE DEEP WNWLY SHEAR WILL BE PRESENT FOR STORM
ORGANIZATION AND SUSTENANCE…AND A CONDITIONAL RISK FOR SVR
HAIL/WIND…GIVEN SUFFICIENT LOW-LVL CONVERGENCE TO FORCE PARCELS TO
THEIR FCS.

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Posted on August 18, 2014, in Iowa, Minnesota, Severe Thunderstorm Watch, Wisconsin and tagged , , , , , , . Bookmark the permalink. Leave a comment.

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