

000 

WWUS20 KWNS 250956

SEL0

SPC WW 250956

IAZ000-ILZ000-MOZ000-251700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 230

NWS STORM PREDICTION CENTER NORMAN OK

455 AM CDT FRI APR 25 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN IOWA

       NORTHWEST ILLINOIS

       NORTHEAST MISSOURI



EFFECTIVE THIS FRIDAY MORNING FROM 455 AM UNTIL NOON CDT.



HAIL TO 1.5 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 EAST AND WEST OF A LINE FROM 30 MILES SOUTH

SOUTHWEST OF KIRKSVILLE MISSOURI TO 15 MILES NORTH NORTHEAST OF

DUBUQUE IOWA.  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...CONTINUE...WW 227...WW 228...WW 229...



DISCUSSION...SW IA/NW MO MCS WITH EMBEDDED SUPERCELLS/SMALL BOWS

EXPECTED TO MOVE ENE THROUGH LATE THIS MORNING...WHILE INDIVIDUAL

STORMS MOVE MORE RAPIDLY NEWD ON LEADING EDGE OF SYSTEM.

STRENGTHENING DEEP WIND FIELD AND GRADUAL INCREASE IN MOISTURE

SUGGEST CONTINUED THREAT FOR SVR WIND/HAIL AS ASSOCIATED SFC LOW NOW

OVER NE KS MOVES NE INTO NRN IA BY NOON LOCAL TIME.  BACKED

LOW-LEVEL FLOW AHEAD OF LOW MAY ENHANCE POTENTIAL FOR LOW-LEVEL

STORM ROTATION.  IF STORMS BECOME MORE DISCRETE LATER THIS

MORNING...PARTS OF THE WW MAY REQUIRE UPGRADE TO TORNADO.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 25035.





...CORFIDI

