WATCHES: Tornado Watch Number 122

WWUS20 KWNS 181040
SEL2
SPC WW 181040
ILZ000-MOZ000-181600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 122
NWS STORM PREDICTION CENTER NORMAN OK
545 AM CDT THU APR 18 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
WEST CENTRAL ILLINOIS
EAST CENTRAL MISSOURI

* EFFECTIVE THIS THURSDAY MORNING FROM 545 AM UNTIL 1100 AM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHEAST OF
FARMINGTON MISSOURI TO 45 MILES NORTH NORTHEAST OF ALTON
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 120...WW 121...

DISCUSSION...A SMALL CLUSTER OF THUNDERSTORMS IS INCREASING TO THE
SOUTHWEST OF STL. THESE STORMS HAVE BEGUN SHOWING SUPERCELL
STRUCTURES. VERY STRONG LOW LEVEL VERTICAL SHEAR COMBINED WITH
SUFFICIENT INSTABILITY MAY POSE A RISK OF DAMAGING WINDS AND
ISOLATED TORNADOES THIS MORNING AS THESE STORMS SPREAD ACROSS THE
WATCH AREA.

AVIATION...TORNADOES AND 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 23035.


...HART

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