WATCHES: Severe Thunderstorm Watch Number 600

WWUS20 KWNS 052154
SEL0
SPC WW 052154
COZ000-IAZ000-KSZ000-MOZ000-NEZ000-060600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 600
NWS STORM PREDICTION CENTER NORMAN OK
450 PM CDT TUE JUL 5 2011

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

A SMALL PART OF NORTHEAST COLORADO
WESTERN IOWA
NORTHERN KANSAS
PARTS OF NORTHWEST MISSOURI
CENTRAL AND SOUTHERN NEBRASKA

EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 450
PM UNTIL 100 AM CDT.

HAIL TO 2.5 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 NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH
NORTHEAST OF SAINT JOSEPH MISSOURI TO 35 MILES NORTHWEST OF
IMPERIAL NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...BAND OF ELEVATED TSTMS IN CNTRL/ERN NEB HAS BEEN
PRESENT SINCE EARLIER TODAY AND APPEARS TO BE BASED AROUND 800-700
MB. THE STORMS SHOULD BECOME INCREASINGLY SFC-BASED OVER THE NEXT
FEW HOURS AS SFC HEATING CONTINUES IN AREA ALONG AND S OF STALLED
W/E BOUNDARY LOCATED BENEATH THE BAND OF STORMS. 30-40 KT NWLY DEEP
SHEAR...MODEST BUT SUSTAINED LOW LVL ELY FLOW...AND PRESENCE OF
AMPLE MOISTURE/DEEP EML SUGGEST POSSIBILITY FOR A FEW SUPERCELLS
WITH LARGE HAIL/DMGG WIND AND POSSIBLY A TORNADO. THE STORMS SHOULD
MERGE INTO ONE OR TWO SE-MOVING MCSS THAT EXTEND THE SVR THREAT INTO
NRN KS/NW MO. OTHER STORMS MAY FORM IN STRONGLY HEATED UPSLOPE
ENVIRONMENT INVOF FRONT AND PRE-FRONTAL CONFLUENCE AXES IN CNTRL/WRN
NEB AND NW KS...WHERE VERY STEEP LOW LVL LAPSE RATES MAY COMPENSATE
FOR SOMEWHAT WEAKER DEEP SHEAR TO YIELD SCTD STORMS WITH SVR
WIND/HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 31020.

...CORFIDI

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