Severe Thunderstorm Watch 230

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.
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