SPC Tornado Watch 233

WW 233 TORNADO IA KS MO NE 281925Z – 290300Z


URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 233
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT TUE MAY 28 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
  SOUTHERN IOWA
  NORTHEAST KANSAS
  NORTHERN MISSOURI
  FAR SOUTHEAST NEBRASKA

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER LIKELY
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH SOUTHWEST OF
CONCORDIA KANSAS TO 60 MILES EAST OF KIRKSVILLE MISSOURI.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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.

&&

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON ALONG SYNOPTIC FRONT EXTENDING FROM LOW
PRESSURE OVER CNTRL KS NEWD ACROSS SRN IA.  OTHER STORMS ONGOING
ALONG AN OUTFLOW BOUNDARY LIFTING NWD THROUGH THE I-70 CORRIDOR OF
MO SHOULD STRENGTHEN AS WELL.  GIVEN THE COMBINATION OF STRONG
INSTABILITY AND 40-50 KT OF DEEP-LAYER SHEAR THE POTENTIAL WILL
EXIST FOR INTENSE SUPERCELLS CAPABLE OF VERY LARGE HAIL AND DAMAGING
WINDS.  GIVEN THE MODEST LOW-LEVEL SHEAR...TORNADO POTENTIAL WILL BE
MODULATED BY MATURE STORMS INTERACTING WITH THE SYNOPTIC FRONT AND
OUTFLOW BOUNDARY WHERE VORTICITY IS ENHANCED.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 26025.


...MEAD

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0233.html