

953 

WWUS20 KWNS 190049

SEL6

SPC WW 190049

IAZ000-MNZ000-WIZ000-190700-



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.



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 500. MEAN STORM

MOTION VECTOR 28030.





...CORFIDI



269 

WWUS20 KWNS 190049

SEL6

SPC WW 190049

IAZ000-MNZ000-WIZ000-190700-



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.



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 500. MEAN STORM

MOTION VECTOR 28030.





...CORFIDI

