

601 

WWUS20 KWNS 190816

SEL3

SPC WW 190816

ILZ000-MOZ000-191600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 153

NWS STORM PREDICTION CENTER NORMAN OK

315 AM CDT TUE APR 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ILLINOIS

       NORTHERN AND EASTERN MISSOURI



EFFECTIVE THIS TUESDAY MORNING FROM 315 AM UNTIL 1100 AM CDT.



HAIL TO 2 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 35 MILES WEST

SOUTHWEST OF CHILLICOTHE MISSOURI TO 30 MILES EAST NORTHEAST OF

SALEM ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...TSTMS...MOST OF WHICH SHOULD BE SLIGHTLY

ELEVATED...EXPECTED TO INCREASE IN COVERAGE AND POSSIBLY INTENSITY

OVER PARTS OF MO/IL DURING THE NEXT SEVERAL HOURS AS WAA STRENGTHENS

ON LEADING EDGE OF ENE-MOVING EML.  PRESENCE OF EML...INCREASING

MOISTURE PROVIDED BY 40-50 KT SWLY LLJ...AND MODERATE CLOUD-LAYER

SHEAR SUGGEST A POTENTIAL FOR SUSTAINED STORMS AND A FEW SUPERCELLS.

 SVR HAIL SHOULD BE THE MAIN SVR THREAT...ALTHOUGH LOCALLY DMGG WIND

ALSO COULD OCCUR...MAINLY IN SRN PART OF WW.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24035.





...CORFIDI

