

492 

WWUS20 KWNS 192348

SEL7

SPC WW 192348

ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-200700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 157

NWS STORM PREDICTION CENTER NORMAN OK

650 PM CDT TUE APR 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN ARKANSAS

       SOUTHERN ILLINOIS

       CENTRAL AND SOUTHWEST INDIANA

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI

       EXTREME NORTHWEST MISSISSIPPI

       NORTHWEST TENNESSEE



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 650 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2.5 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF

MUNCIE INDIANA TO 50 MILES WEST OF MONTICELLO ARKANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 154...WW 155...WW 156...



DISCUSSION...THUNDERSTORMS CONTINUE TO INCREASE IN COVERAGE IN

SEVERAL CLUSTERS/BANDS ALONG AND E OF A COLD FRONT MOVING INTO NW AR

AND CENTRAL MO...AND SURFACE LOW IN CENTRAL IL.  STRONG INSTABILITY

REMAINS IN ADVANCE OF THE BROKEN LINE TO THE S OF THE WARM FRONT IN

INDIANA...AND CONVECTION IS EXPECTED TO GROW UPSCALE INTO A LARGER

SQUALL LINE THROUGH THE EARLY OVERNIGHT HOURS.  DAMAGING WINDS WILL

BECOME THE MOST COMMON THREAT...THOUGH LARGE HAIL AND A FEW

TORNADOES WILL REMAIN POSSIBLE...ESPECIALLY THIS EVENING WITH THE

MORE DISCRETE SUPERCELL STRUCTURES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 27030.





...THOMPSON

