Outflow from thunderstorms in Central Iowa spawned an intense thunderstorm that moved across Clinton County.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DVN wrote it up.
Outflow from thunderstorms in Central Iowa spawned an intense thunderstorm that moved across Clinton County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before the first event at Jul 6, 2:34 AM CST, 2 hours 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 334 AM CDT SUN JUL 6 2003 LARGE MCS MOVING OVER WESTERN HALF IA TO MOVE ACROSS CWFA THIS MORNING IN RAPIDLY DECAYING MODE. SEVERE THREAT LOOKS MINIMAL AS IR IMAGERY SHOWS COOLING TOPS AND 88D MOSAIC SHOWS SYSTEM BECOMING MORE DISORGANIZED AT LEADING EDGE. ALSO...COMPLEX IS MOVING INTO AIRMASS OVER SOUTHERN IA AND SOUTHERN HALF DVN CWA ALREADY WORKED OVER BY EVENING MCS. INITIAL FORECAST CHALLENGE IS HANDLING OF POPS THIS MORNING...THEN CHANCES FOR ADDITIONAL MAINLY NOCTURNAL COMPLEXES NEXT SEVERAL DAYS BEFORE PATTERN CHANGE PUSHES FRONT SOUTH OF AREA MID TO LATE WEEK. AT 06Z...SURFACE ANALYSIS SHOWED MESO HIGH OVER WESTERN IA. EARLIER CONVECTION HAD PUSHED SYNOPTIC BOUNDARY TO AXIS FROM CENTRAL IA TO JUST SOUTH OF QUAD CITIES TO NEAR KPIA. SOME FLARE UP OF NEAR SEVERE WIND PRODUCERS POSSIBLE AROUND AM PACKAGE ISSUANCE TIME ALONG NW EDGE OF THIS FRONT THAT HAS SINCE LIFTED NORTH TO NEAR KALO SOUTHEAST THROUGH QUAD CITIES. EXPECTING WIDESPREAD RAIN AND FEW CONTINUED LIGHTNING STRIKES AS SYSTEM DECAYS AS IT PUSHES EAST AND THUS RAISED TO CATEGORICAL POPS OVER EASTERN IA AND NORTHEAST MO UNTIL MID MORNING...KEEPING SCATTERED WORDING FURTHER EAST THROUGH LATE MORNING. SHOULD THEN SEE RAPID CLEARING WITH MORE HEAT AND HUMIDITY THROUGH AFTERNOON. KEPT SLIGHT CHANCES FOR MAINLY LATE AFTERNOON CONVECTION ALONG BOUNDARY IN FAR NORTH BUT MOST OF CWFA WILL BE CAPPED. MODELWISE...MAINLY FOLLOWED GFS AS ETA HAD POOR HANDLE ON THIS MORNINGS MCS. CHANCE POPS KEPT IN NORTHERN THIRD FOR TONIGHT WHERE NEXT COMPLEX SET OFF BY MT SHORTWAVE EXPECTED TO MOVE ALONG FRONT. MODELS TRY TO PUSH FRONT BACK SOUTHEAST IN RESPONSE TO STRONG MID LEVEL VORTEX MOVING ACROSS SOUTHERN CANADA...BUT DO NOT ANTICIPATE THE FRONT TO MAKE MUCH PROGRESS UNTIL LATE WED/WED NIGHT WHEN H5 RIDGE BEGINS TO BUILD OVER WESTERN CONUS. HAVE THUS CONTINUED SCATTERED POPS THROUGH PERIOD WITH TOO MUCH UNCERTAINTY ON BOUNDARY LOCATION TO GET TOO DETAILED. DID EXTEND LOW POPS INTO WED NIGHT...BUT THINK GFS MAY BE SUFFERING FROM FEEDBACK AND OVERDOING SURFACE LOW PASSING OVERHEAD IN THAT TIMEFRAME. LATER FORECASTS WILL NEED TO WATCH FOR FLASH FLOOD POTENTIAL IN AREAS OF MAINLY FAR NORTH AND FAR SOUTH THAT HAVE BEEN RECENTLY SATURATED. VERY FEW CHANGES MADE TO GRIDS THURSDAY AND BEYOND AS MEDIUM RANGE GUIDANCE SHOWS UPPER LEVEL RIDGE OVER ROCKIES RESULTING IN NW FLOW OVER REGION TO RESULT IN DRIER AIRMASS AND COOLER TEMPERATURES. .DVN... IA...NONE. IL...NONE. MO...NONE. SHEETS
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-061000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 439 PM CDT SAT JUL 5 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN IOWA... NORTHWEST AND WEST CENTRAL ILLINOIS...AND NORTHEAST MISSOURI. .DAY ONE...TONIGHT... ISOLATED THUNDERSTORMS WILL BE POSSIBLE EARLY THIS EVENING...ALONG AND SOUTH OF HIGHWAY 34. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. AFTER MIDNIGHT...A THUNDERSTORM COMPLEX IS FORECAST TO MOVE EAST OUT OF WESTERN IOWA. SEVERE STORMS WILL BE POSSIBLE ALONG AND NORTH OF INTERSTATE 80. THE MAIN THREAT WILL BE DAMAGING WINDS UP TO 80 MPH. HEAVY RAIN IS ALSO LIKELY DUE TO HIGH MOISTURE LEVELS IN THE ATMOSPHERE. THE HEAVY RAIN COULD RESULT IN SOME LOCALIZED FLOODING...ESPECIALLY ALONG THE HIGHWAY 20 CORRIDOR. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... THE THUNDERSTORM COMPLEX THAT DEVELOPS TONIGHT WILL AFFECT THE AREA THROUGH MID DAY SUNDAY. ANOTHER ROUND OF SEVERE STORMS WILL BE POSSIBLE SUNDAY NIGHT AS A COMPLEX OF THUNDERSTORMS DROPS OUT OF SOUTHEAST MINNESOTA...THROUGH THE MID MISSISSIPPI RIVER VALLEY. THE GREATEST POTENTIAL FOR SEVERE STORMS WILL AGAIN BE NORTH OF INTERSTATE 80. THERE IS A POTENTIAL FOR DAMAGING WINDS AND ISOLATED TORNADOES. THUNDERSTORMS WILL CONTINUE TO THREATEN THE REGION MONDAY THROUGH WEDNESDAY...AS A FRONTAL BOUNDARY STALLS ACROSS SOUTHERN IOWA AND NORTHERN MISSOURI. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS EXPECTED LATE TONIGHT. SPOTTER ACTIVATION MAY ALSO BE NEEDED SUNDAY NIGHT. && MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING URL: HTTP://WWW.CRH.NOAA.GOV/DVN DLF
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1240 AM CDT SUN JUL 06 2003
PRELIMINARY EVENT SUMMARY FOR SATURDAY EVENING JULY 5TH
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0715 PM BIGGSVILLE IL .5 INCH HAIL
07/05/03 HENDERSON REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0717 PM MONTROSE IA .5 INCH HAIL
07/05/03 LEE REPORTED BY EMERGENCY
MANAGEMENT.
0737 PM 4 W DONNELLSON IA .75 INCH HAIL
07/05/03 LEE REPORTED BY STORM
SPOTTER.
0800 PM FT MADISON IA .75 INCH HAIL
07/05/03 LEE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0830 PM DONNELLSON IA WIND DAMAGE
07/05/03 LEE TREES AND POWERLINES
DOWN. REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0831 PM FARMINGTON IA FLOOD
07/05/03 VAN BUREN WATER OVER THE ROAD AT
INTERSECTION OF
HIGHWAYS 1 AND 2.
REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0831 PM 5 N FARMINGTON IA 1 INCH HAIL
07/05/03 VAN BUREN REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0913 PM SANDUSKY IA WIND DAMAGE
07/05/03 LEE 3-4 FOOT DIAMETER TREE
DOWN. REPORTED BY STORM
SPOTTER.
0915 PM 4 NW KEOKUK IA .88 INCH HAIL
07/05/03 LEE REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0932 PM 4 N GRANGER MO 1 INCH HAIL
07/05/03 SCOTLAND
0932 PM GRANGER MO 60 MPH TSTM GUST
07/05/03 SCOTLAND 50-60 MPH WINDS
REPORTED BY STORM
SPOTTER.
1000 PM WAYLAND MO WIND DAMAGE
07/05/03 CLARK LARGE LIMBS AND POWER
LINES DOWN. REPORTED BY
STORM SPOTTER.
1003 PM NAUVOO IL 55 MPH TSTM GUST
07/05/03 HANCOCK ESTIMATED 50 TO 60 MPH
WINDS AND NOISE FROM
TREE LIMBS BREAKING IN
NEARBY PARK REPORTED BY
STORM SPOTTER.
1005 PM FT MADISON IA 50 MPH TSTM GUST
07/05/03 LEE REPORTED BY STORM
SPOTTER.
1010 PM FT MADISON IA WIND DAMAGE
07/05/03 LEE POWER LINES DOWN.
REPORTED BY EMERGENCY
MANAGEMENT.
1019 PM WARSAW IL WIND DAMAGE
07/05/03 HANCOCK TREES DOWN. POWER OUT.
REPORTED BY LAW
ENFORCEMENT OFFICIAL.
1020 PM WAYLAND MO WIND DAMAGE
07/05/03 CLARK LARGE LIMBS AND POWER
LINES DOWN. REPORTED BY
STORM SPOTTER.
1022 PM WEST PT IL 50 MPH TSTM GUST
07/05/03 HANCOCK REPORTED BY LAW
ENFORCEMENT OFFICIAL.
1022 PM 2 SW FARMINGTON IA FLOOD
07/05/03 VAN BUREN CULVERT PATIALLY WASHED
OUT HALF OF COUNTY ROAD
NAMED POSSUM HOLLOW
LANE, CNTY RD 10.
MEASURED 4.5 INCHES OF
RAIN. REPORTED BY STORM
SPOTTER.
1026 PM HAMILTON IL WIND DAMAGE
07/05/03 HANCOCK POWER POLES DOWN. POWER
OUT IN TOWN. REPORTED
BY LAW ENFORCEMENT
OFFICIAL.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
454 AM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0453 AM DELHI IA .5 INCH HAIL
07/06/03 DELAWARE REPORTED BY LAW
ENFORCEMENT OFFICIAL.The Quad Cities radar (KDVN), 20 km away, was scanning. The volume nearest the first event began at 11:09 UTC.
1 thunderstorm wind. Local standard time, as filed.
18 inch limbs down & power out
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2003Every state in 2003This day in weather historyWarnings in Iowa, July 2003
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5377633.