WATCHES: Severe Thunderstorm Watch Number 678

WWUS20 KWNS 211856
SEL8
SPC WW 211856
IAZ000-ILZ000-MOZ000-220200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 678
NWS STORM PREDICTION CENTER NORMAN OK
155 PM CDT TUE SEP 21 2010

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

SOUTHERN IOWA
FAR WEST-CENTRAL ILLINOIS
NORTHERN MISSOURI

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
900 PM 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH OF
KANSAS CITY MISSOURI TO 20 MILES NORTHEAST OF KIRKSVILLE
MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 676...WW 677...

DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY THIS AFTERNOON AHEAD OF
WELL-DEFINED VORTICITY MAXIMUM CURRENTLY OVER NERN KS/SERN NEB.
AMBIENT WARM SECTOR AIR MASS IS WARM AND MOIST WITH MLCAPE VALUES OF
1500-2500 J/KG. WHILE REGION RESIDES ALONG SRN FRINGE OF STRONGER
MID AND HIGH-LEVEL FLOW ATTENDANT TO UPPER GREAT LAKES TROUGH...AREA
PROFILER DATA INDICATE SUFFICIENT DEEP SWLY SHEAR TO SUPPORT
ORGANIZED MULTICELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING WINDS
AND HAIL.

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 26030.

...MEAD

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