Saturday, July 23, 2011

WATCHES: Severe Thunderstorm Watch Number 679

WWUS20 KWNS 232217
SEL9
SPC WW 232217
IAZ000-MOZ000-NEZ000-240600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 679
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT SAT JUL 23 2011

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

SOUTHERN IOWA
NORTHERN MISSOURI
FAR SOUTHEAST NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 515 PM
UNTIL 100 AM CDT.

HAIL TO 1.5 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 120
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH
NORTHWEST OF KNOXVILLE IOWA TO 15 MILES SOUTH SOUTHWEST OF LAMONI
IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 678...

DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING ALONG NRN EDGE OF
STEEP LOW LVL LAPSE RATES PLUME THAT LIES BENEATH BELT OF SLIGHTLY
ENHANCED MID LVL FLOW AND CORRIDOR OF HIGH PW ALONG NRN FRINGE OF
SUBTROPICAL HIGH. SETUP APPEARS CONDUCIVE TO PRODUCTION OF WET
MICROBURSTS WITH DMGG WIND...AND POSSIBLY MARGINALLY SVR HAIL /REF
MCD 1711/.

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 26025.


...CORFIDI

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