TORNADO WATCH NUMBER 258
NWS STORM PREDICTION CENTER NORMAN OK
145 PM CDT THU MAY 7 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF SOUTHWEST IOWA
PARTS OF NORTHEAST KANSAS
LARGE PART OF NORTHERN MISSOURI
PARTS OF SOUTHEAST NEBRASKA
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
800 PM CDT.
TORNADOES...HAIL TO 3 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 90 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF FALLS CITY
NEBRASKA TO 35 MILES SOUTH SOUTHEAST OF KIRKSVILLE MISSOURI. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).
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.
DISCUSSION...LOW LEVEL MOISTURE AND INSTABILITY RETURNING RAPIDLY
ERN KS ON 30KT LLJ. CONVERGENCE ALONG BOUNDARY SERN NEB EWD INTO
SWRN IA WILL BE FOCUS FOR STORM INITIATION. STRONG VEERING SHEAR
PROFILES AND STEEP MID LEVEL LAPSE RATES SUPPORT RAPID DEVELOPMENT
OF STRONG/SEVERE THUNDERSTORMS VICINITY OF BOUNDARY. SUPERCELLS
LIKELY...WHICH WILL THEN MOVE/DEVELOP E/SE INTO RETURNING
INSTABILITY. VERY LARGE HAIL IS LIKELY WITH ANY SUPERCELL AND
TORNADO THREAT WILL INCREASE THRU THE AFTERNOON AS STORMS MOVE INTO
GREATER INSTABILITY.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 30025.
IOWA COUNTIES INCLUDED ARE ADAMS APPANOOSE
CLARKE DECATUR FREMONT MILLS
MONTGOMERY PAGE POTTAWATTAMIE RINGGOLD
TAYLOR UNION WAYNE
KANSAS COUNTIES INCLUDED ARE
ATCHISON BROWN DONIPHAN
DOUGLAS JACKSON JEFFERSON
JOHNSON LEAVENWORTH NEMAHA
WYANDOTTE
MISSOURI COUNTIES INCLUDED ARE ADAIR ANDREW
ATCHISON BUCHANAN CALDWELL CARROLL
CHARITON CLAY CLINTON COOPER
DAVIESS DEKALB GENTRY GRUNDY
HARRISON HOLT HOWARD JACKSON
JOHNSON LAFAYETTE LINN LIVINGSTON
MACON MERCER NODAWAY PETTIS
PLATTE PUTNAM RANDOLPH RAY
SALINE SCHUYLER SULLIVAN WORTH
NEBRASKA COUNTIES INCLUDED ARE CASS DOUGLAS
JOHNSON NEMAHA OTOE PAWNEE
RICHARDSON SARPY
No comments:
Post a Comment