Severe Thunderstorm Watch #775
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 775
NWS STORM PREDICTION CENTER NORMAN OK
110 PM CDT THU SEP 8 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHWEST ILLINOIS
NORTHEAST MISSOURI
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 110 PM UNTIL
700 PM 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 75
STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTH NORTHWEST
OF OTTUMWA IOWA TO 40 MILES SOUTH SOUTHWEST OF PEORIA ILLINOIS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 774...
DISCUSSION...BOW ECHO MCS WITH A HISTORY OF WIND DAMAGE AND HAIL TO
THE SIZE OF GOLF BALLS AS OF 18Z IS EXPECTED TO CONTINUE A GENERAL
SEWD MOTION ALONG QUASI-STATIONARY SURFACE FRONT. MODERATE
INSTABILITY ALONG THE BOUNDARY AND STRONG DEEP LAYER SHEAR SHOULD
SUSTAIN A THREAT OF DAMAGING WINDS AND LARGE HAIL FROM SMALL SCALE
BOW ECHOES AND SUPERCELLS ALONG SURGING OUTFLOW BOUNDARY.
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 32035.
...EVANS
Counties in Iowa include:
APPANOOSE BENTON CEDAR
CLINTON DAVIS DES MOINES
HENRY IOWA JEFFERSON
JOHNSON JONES KEOKUK
LEE LINN LOUISA
LUCAS MONROE MUSCATINE
SCOTT VAN BUREN WAPELLO
WASHINGTON WAYNE