

492 

WWUS20 KWNS 191813

SEL0

SPC WW 191813

IAZ000-MNZ000-WIZ000-200200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 180

NWS STORM PREDICTION CENTER NORMAN OK

110 PM CDT SUN MAY 19 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN IOWA

  SOUTHERN AND CENTRAL MINNESOTA

  WESTERN WISCONSIN



* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 110 PM UNTIL

  900 PM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 65 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 70 MILES NORTH NORTHEAST OF

REDWOOD FALLS MINNESOTA TO 25 MILES SOUTH SOUTHEAST OF WATERLOO

IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 179...



DISCUSSION...THUNDERSTORM ACTIVITY IS EXPECTED TO CONTINUE TO

INCREASE AND INTENSIFY NEAR A CONVECTIVELY GENERATED CYCLONIC

VORTICITY CENTER AS IT MIGRATES NORTHWARD FROM IOWA INTO SOUTHERN

MINNESOTA THIS AFTERNOON.  AIDED BY AMBIENT VERTICAL VORTICITY...AND

BOUNDARY LAYER DESTABILIZATION...SUPERCELL STRUCTURES ARE

POSSIBLE...WITH A RISK FOR TORNADOES...IN ADDITION TO LARGE HAIL AND

POTENTIALLY DAMAGING WIND GUSTS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 55 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 26030.





...KERR

