

181 

WWUS20 KWNS 070229

SEL0

SPC WW 070229

IAZ000-ILZ000-KSZ000-MOZ000-LMZ000-070900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 60

NWS STORM PREDICTION CENTER NORMAN OK

930 PM CDT TUE APR 6 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PART OF EASTERN IOWA

       PARTS OF NORTHERN AND WESTERN ILLINOIS

       SMALL PART OF SOUTHEAST KANSAS

       PARTS OF WESTERN AND NORTHERN MISSOURI

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 930 PM

UNTIL 400 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF

ROCKFORD ILLINOIS TO 35 MILES WEST SOUTHWEST OF JOPLIN MISSOURI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 56...TORNADO WATCH NUMBER 57.

WATCH NUMBER 56 57 WILL NOT BE IN EFFECT AFTER 930 PM CDT.

CONTINUE...WW 58...



DISCUSSION...THUNDERSTORMS WILL CONTINUE ACTIVE ALONG AND AHEAD OF

COLD FRONT OVERNIGHT AS STRONG UPPER TROUGH AND ASSOCIATED LARGE

SCALE ASCENT SPREADS ACROSS THE AREA.  WITH MLCAPES AOA 1000 J/KG

AND STEEP MID LEVEL LAPSE RATES...HAIL AND DAMAGING WINDS WILL

ACCOMPANY MOST VIGOROUS  UPDRAFTS INCLUDING SHORT LINES AND BOWS

THAT MAY ALSO DEVELOP.



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.





...HALES

