

000 

WWUS20 KWNS 162042

SEL5

SPC WW 162042

IAZ000-ILZ000-170400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 525

NWS STORM PREDICTION CENTER NORMAN OK

340 PM CDT MON JUL 16 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN IOWA

       NORTHWEST ILLINOIS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 340 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 2.5 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 EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHWEST OF

WATERLOO IOWA TO 35 MILES SOUTH SOUTHEAST OF OTTUMWA IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 523...WW 524...



DISCUSSION...TSTMS DEVELOPING INVOF NNW-SSE ORIENTED OUTFLOW

BOUNDARY/WARM FRONT IN ERN IA EXPECTED TO BECOME SUPERCELLS WITH AN

ATTENDANT THREAT FOR HAIL/HIGH WIND AND A COUPLE TORNADOES GIVEN

CONTINUED SFC HEATING...FAIRLY RICH MOISTURE ENVIRONMENT AND

ENHANCED LOW LVL SHEAR.  OTHER STORMS MAY FORM LATER THIS AFTERNOON

IN TCU FIELD ACROSS CNTRL/SE IA.  BY EARLY/MID EVENING...ADDITIONAL

STORMS MAY MOVE SSE INTO WW FROM SRN MN/NRN IA...POSSIBLY IN THE

FORM OF AN MCS WITH A CONTINUING THREAT FOR HAIL/HIGH WIND.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 33030.





...CORFIDI

