SPC Severe Thunderstorm Watch 87

WW 87 SEVERE TSTM IA KS MO NE 092245Z – 100600Z

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 87
NWS STORM PREDICTION CENTER NORMAN OK
545 PM CDT TUE APR 9 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       SOUTHWEST IOWA
       NORTHEAST KANSAS
       NORTHWEST MISSOURI
       SOUTHEAST NEBRASKA

EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 545
PM UNTIL 100 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST OF
SALINA KANSAS TO 35 MILES EAST NORTHEAST OF LINCOLN NEBRASKA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 86...

DISCUSSION...SIGNIFICANT ELEVATED BUOYANCY EXISTS ATOP SHALLOW
ARCTIC AIR MASS.  MUCAPE ON THE ORDER OF 1500 J/KG HAS ADVANCED
NORTH OF I-70 AND FAVORABLE TRAJECTORIES SUPPORT FURTHER
DESTABILIZATION INTO PORTIONS OF SERN NEB AND SWRN IA.  MULTIPLE
CLUSTERS OF STRONG ELEVATED THUNDERSTORMS ARE EXPECTED THIS EVENING
WITH THE GREATEST SEVERE RISK BEING LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 21035.


...DARROW

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via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0087.html