

552 

WWUS20 KWNS 052053

SEL6

SPC WW 052053

IAZ000-ILZ000-MOZ000-060400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 266

NWS STORM PREDICTION CENTER NORMAN OK

350 PM CDT SAT JUN 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN IOWA

       WESTERN ILLINOIS

       NORTHERN MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 350 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF

DES MOINES IOWA TO 10 MILES SOUTH SOUTHEAST OF PEORIA ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 262...WW 263...WW

264...WW 265...



DISCUSSION...SCATTERED ELEVATED STORMS WERE LOCATED IN WESTERN IA

AND WERE EXPECTED TO INTENSIFY AS THEY MOVE SEWD AND BECOME ROOTED

INTO A VERY UNSTABLE BOUNDARY LAYER. DEEP LAYER SHEAR AT 50 KT AND

STRONG INSTABILITY WILL BE FAVORABLE FOR SUPERCELLS WITH VERY LARGE

HAIL. DESPITE SWLY BOUNDARY LAYER WINDS...STRONGLY VEERING WINDS IN

THE LOWER 1-2 KM AND RICH BOUNDARY LAYER MOISTURE ALSO APPEARS

FAVORABLE FOR A FEW TORNADOES. LATE IN THE EVENING...THE OUTFLOWS

ARE LIKELY TO MERGE WITH THE POTENTIAL FOR A SQUALL LINE WITH WIND

DAMAGE TO EVOLVE.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 29030.





...IMY

