

384 

WWUS20 KWNS 152143

SEL0

SPC WW 152143

ILZ000-MOZ000-160500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 180

NWS STORM PREDICTION CENTER NORMAN OK

445 PM CDT SUN APR 15 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN ILLINOIS

       EASTERN MISSOURI



EFFECTIVE THIS SUNDAY AFTERNOON FROM 445 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES EAST SOUTHEAST OF

WEST PLAINS MISSOURI TO 20 MILES NORTH NORTHEAST OF QUINCY

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 177...WW 178...WW 179...



DISCUSSION...TSTMS IN PROGRESS OVER CNTRL MO ARE EXPECTED TO

INTENSIFY AS LARGE-SCALE FORCING FOR ASCENT INCREASES ACROSS THE

REGION THIS EVENING.  WHILE INSTABILITY WILL REMAIN MARGINAL WITH

MLCAPE OF GENERALLY LESS 500 J/KG...THE PRESENCE OF STRONG VERTICAL

SHEAR AND INCREASED FORCING FOR ASCENT INDICATE A RISK OF EMBEDDED

SUPERCELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND A

COUPLE OF TORNADOES.



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

450. MEAN STORM MOTION VECTOR 22040.





...MEAD

