

791 

WWUS20 KWNS 102314

SEL2

SPC WW 102314

IAZ000-ILZ000-MOZ000-110600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 122

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SUN APR 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR EASTERN IOWA

       WESTERN...CENTRAL AND NORTHERN ILLINOIS

       EASTERN MISSOURI



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 610 PM UNTIL

100 AM CDT.



TORNADOES...HAIL TO 2 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 70 STATUTE

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

ROCKFORD ILLINOIS TO 50 MILES EAST SOUTHEAST OF JEFFERSON CITY

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...TSTMS EXPECTED TO INCREASE IN NUMBER AND STRENGTH

THROUGH LATE EVE ALONG MERGING DRY LINE...PRE-FRONTAL CONFLUENCE

ZONE...AND COLD FRONT FROM FAR ERN IA SWD INTO ERN MO.  OTHER STORMS

MAY FORM FARTHER E ALONG SSW-NNE BAND OF CONFLUENCE NOTED OVER CNTRL

IL.  WHILE LARGE SCALE ASCENT ATTM APPEARS TO BE DOWNWARD IN WAKE OF

PASSING UPR IMPULSE NOW ENTERING WI...LARGE SCALE ASCENT MAY

OVERSPREAD LATER THIS EVE AS JET ENTRANCE REGION EVOLVES AHEAD OF

PROGRESSIVE LARGER SCALE UPR TROUGH.  WITH SFC HEATING/LOW-LVL

CONVERGENCE ALREADY HAVING INITIATED CONVECTION/STORMS IN ERN IA/NE

MO...AND WITH THE EXPECTATION FOR INCREASING LARGE SCALE UVV LATER

THIS EVE...A POTENTIAL WILL EXIST FOR SUSTAINED STORMS.

LONG...SLIGHTLY-HOOKED HODOGRAPHS SUGGEST POSSIBILITY FOR

SUPERCELLS/LEWPS WITH TORNADOES...IN ADDITION TO SVR WIND AND HAIL.



AVIATION...TORNADOES AND 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

550. MEAN STORM MOTION VECTOR 24045.





...CORFIDI

