A cold front stalled across eastern Iowa and northwest Illinois during the morning hours of July 9th. The front then acted as the focal point for shower and thunderstorm development through much of the day.
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.
A cold front stalled across eastern Iowa and northwest Illinois during the morning hours of July 9th. The front then acted as the focal point for shower and thunderstorm development through much of the day. Torrential rains, hail up to the size of a quarter, and damaging winds were common across areas mainly over southeast and east central Iowa and northwest and west central Illinois.
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 9, 2:00 PM CST, 4 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 300 PM CDT MON JUL 9 2007 .SYNOPSIS... A STRONG COLD FRONT WILL MOVE THROUGH THE REGION ON TUESDAY AND BRING AN END TO THE HOT AND HUMID WEATHER OVER THE AREA. UNTIL THIS FRONT ARRIVES...THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL ARE EXPECTED. && .SHORT TERM...TONIGHT AND TUESDAY... THE BIG QUESTION IS IF ANY HEADLINES ARE NEEDED. CURRENT CONVECTION IS FALLING OVER AN AREA THAT CAN TAKE A CONSIDERABLE AMOUNT OF RAIN BEFORE PROBLEMS DEVELOP. HOWEVER...SLOW MOVEMENT OF SAID CONVECTION WILL RESULT IN HIGH RAINFALL RATES AND LOCALLY HEAVY RAINFALL. THREAT IS NOT CLEAR CUT AND WITH CONVECTION STILL EVOLVING...WILL HOLD OFF ON ISSUING A HEADLINE BUT WILL PASS ON TO NEXT SHIFT TO WATCH CLOSELY. MODELS HAVE MAIN FRONT MOVING THROUGH THE CWFA DURING PEAK HEATING ON TUESDAY. MODELS NOT HANDLING THIS WELL BUT AGAIN EXPECT MORE STRONG CONVECTION TO FIRE WITH LOCALLY HEAVY RAINFALL EXPECTED WITH CONVECTION TO BE ALONG/AHEAD OF COLD FRONT. WILL HOLD OFF ON MENTIONING LOCALLY HEAVY RAIN FOR TUESDAY DUE TO UNCERTAINTY OF AREAL COVERAGE OF THE THREAT. WILL PASS THIS CONCERN ON TO SUBSEQUENT SHIFTS. TEMPS SHOULD BE MAINLY IN THE 70S OVERNIGHT WITH UPPER 80S AND LOW 90S PRIOR TO FROPA ON TUESDAY. ..08.. .LONG TERM... TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...LATEST SUITE OF MODEL RUNS CONTINUE TO TREND AMAZINGLY QUICKER WITH DIGGING PROCESS OF VIGOROUS NORTHERN STREAM WAVE ACRS ONTARIO AND LK SUPERIOR REGION TUE NIGHT. THUS ASSOCIATED SFC FRONT WILL ALSO SWEEP THROUGH THE FCST AREA FROM WSW-TO-ESE MUCH QUICKER NOW ON LATEST SOLUTIONS...WITH FROPA ACRS THE MS RVR GENERAL AROUND 00Z WED OR SO/ALTHOUGH THE EVEN QUICKER UKMET AND GFS HAVE THE FRONT ALMOST EXITING THE ENTIRE CWA BY THEN/. WITH LATEST TRENDS...WILL FOLLOW THE GFS AND UKMET WHICH ARE SIMILAR...AND WALK OUT STRONG TO SEVERE LINEAR CONVECTIVE LINE OUT OF SOUTHEASTERN THIRD OF THE CWA IN THE EVENING. FCST SOUNDINGS AND LOW TO MID LEVEL THTA-E LAPSE RATES SUGGEST DAMAGING STRAIGHT LINE WINDS POSSIBLE IN THESE AREAS THROUGH 02Z-03Z OR SO. THE PROGRESSIVE NATURE OF THE STORMS SHOULD LIMIT EVENING FLOODING POTENTIAL...BUT DEPENDING ON HOW MUCH RAINFALL WEST CENTRAL IL AND NORTHEAST MO GET TONIGHT...QUICK RUN-OFF FROM A PASSING SQUALL LINE COULD AGGRAVATE SOME HYDRO SITUATIONS. WITH THE QUICKER FROPA... A QUICKER ARRIVAL OF COOLER DRIER AIR MAY MEAN A BETTER SHOT OF WIDESPREAD LOWS IN THE MID TO UPPER 50S BY WED MORNING. WON/T GO QUITE THAT COOL YET...BUT WILL CONTINUE TO TREND DOWN WED MORNING TEMPS. DEEP MIXING TO OVER H85 MB AND FULL INSOLATION WILL BE NEEDED TO GET THE PROGGED 80 DEGREES FOR HIGHS ON WED LOOKING AT FCST THERMAL PROFILES BY THE GFS AND NAM AS CANADIAN SFC RIDGE CENTER BUILDS SOUTH ACRS THE CENTRAL PLAINS...MAY ONLY GO WITH UPPER 70S. DEPENDING ON HOW FAST SOMETHING CAN PROPAGATE DOWN THROUGH DEEP NORTHWEST FLOW WED NIGHT...THE CWA SHOULD BE UNDER A FAIR WX AND COOLING REGIME THRU THU MORNING. IN THE EXTENDED/THU-MON/...FOR THE THIRD 12Z RUN IN A ROW...BOTH THE GFS AND ECMWF ARE ADVERTISING SOME TYPE OF WAVE TO RIPPLE THROUGH CYCLONIC FLOW ALOFT DURING THU AFTERNOON OR NIGHT...AND COMBINING WITH MID LEVEL COOL POOL INDUCED INSTABILITY...DEVELOP SHOWERS AND THUNDERSTORMS SOMEWHERE IN THE VCNTY DURING THAT PERIOD. TIMING SUCH A FEATURE PROBLEMATIC STILL AT THIS POINT AS WELL AS IF THERE WILL BE ENOUGH LOW TO MID LEVEL MOISTURE AVAILABLE...BUT WITH THE RUN TO RUN INDICATION UP UNTIL NOW...IT MAY BE WORTH INTRODUCING SLIGHT CHC POPS FOR THU AFTERNOON AND EVENING. LATEST AVAILABLE MEDIUM RANGE MODEL RUNS NOT QUITE AS BULLISH WITH EXTENT OF COOL DUMP DOWN ACRS THE WESTERN GRT LKS FOR FRI AND INTO THE WEEKEND...AND DE-AMPLIFY THE UPPER AIR PATTERN SOME THROUGH MONDAY. STILL...THERMAL PROFILES SUGGEST BELOW NORMAL TEMPS IN THE UPPER 70S TO LOW 80S THROUGH MUCH OF THAT PERIOD...WITH LOWS IN THE 50S TO LOWER 60S. WILL KEEP WEEKEND AND NEXT MONDAY DRY...WITH RETURN FLOW TEMP MODERATION BY MONDAY LEADING TO A WARM UP AT LEAST INTO THE MID 80S IN MUCH OF THE FCST AREA. NORTHWEST FLOW OVER THE WEEKEND TO THE SOUTHWEST OF EASTERN HUDSON BAY VORTEX WILL PROBABLY USHER ANOTHER DISTURBANCE OVER OR NEAR THE AREA...BUT TIMING ANOTHER FEATURE LIKE THAT AT THIS POINT UNCERTAIN ENOUGH TO NOT MENTION ANY CHC POPS FOR NOW. ..12.. && .AVIATION... NONLINEAR PROCESSES ARE DRIVING THE CURRENT AND EXPECTED WX. HIGH PRECIPITABLE WATER COMBINED WITH BOUNDARIES AND VORT MAXES ALOFT TO DRIVE TSRA DEVELOPMENT TONIGHT AND AGAIN WITH THE MAIN FRONT APPROACHING TUESDAY. THERE MAY BE A BRIEF LULL IN TSRA/SHRA DEVELOPMENT LATE TONIGHT/TUESDAY MORNING. ALL TAF SITES LIKELY TO BE AFFECTED AT SOME POINT IN THE NEXT 24 HRS. PROBABILITY HIGH OF SEEING IFR CIGS AND MVFR IF NOT IFR VSBYS. ..08.. && DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && 08/12
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 440 AM CDT MON JUL 9 2007 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-100945- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON- CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON- HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL- WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON- WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- 440 AM CDT MON JUL 9 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS TODAY...MAINLY ALONG AND NORTH OF INTERSTATE 80...AS WELL AS A CHANCE OF HEAVY RAIN. A COLD FRONT MOVING SLOWLY SOUTHWARD INTO IOWA AND ILLINOIS WILL STALL AND WEAKEN TODAY...AND WILL PROVIDE A TRIGGER FOR THUNDERSTORMS. THUNDERSTORMS MAY TRAIN ALONG THE FRONT...PRODUCING LONG PERIODS OF RAINFALL ACROSS PARTS OF THE AREA. THE MAIN THREATS FROM THESE THUNDERSTORMS WILL BE DAMAGING WINDS AND SMALL HAIL ALONG WITH THE POTENTIAL FOR HEAVY RAIN. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS ON TUESDAY AFTERNOON AND EVENING...MAINLY ALONG AND NORTH OF INTERSTATE 80. A STRONGER COLD FRONT WILL SWEEP ACROSS THE AREA ON TUESDAY AFTERNOON AND EVENING...BRINGING A CHANCE OF THUNDERSTORMS. THE MAIN THREATS FROM THESE THUNDERSTORMS WILL BE DAMAGING WINDS AND LARGE HAIL. LOCALLY HEAVY RAINFALL MAY ALSO OCCUR...THOUGH THE RISK FOR HEAVY RAIN IS LOWER WITH THE FASTER MOVEMENT OF THE COLD FRONT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY AND THIS EVENING...MAINLY NORTH OF INTERSTATE 80. IN ADDITION...SPOTTERS ARE ENCOURAGED TO CONTACT THE NATIONAL WEATHER SERVICE WITH REPORTS OF RAIN OVER ONE INCH. MAYES
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
627 PM CDT MON JUL 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0625 PM HAIL 1 S DEWITT 41.81N 90.55W
07/09/2007 M0.50 INCH CLINTON IA NWS EMPLOYEE
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
630 PM CDT MON JUL 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0629 PM HAIL 1 S DEWITT 41.81N 90.55W
07/09/2007 M1.00 INCH CLINTON IA NWS EMPLOYEE
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
700 PM CDT MON JUL 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0653 PM HAIL BENNETT 41.74N 90.97W
07/09/2007 E0.50 INCH CEDAR IA TRAINED SPOTTER
PEA SIZE HAIL.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
709 PM CDT MON JUL 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM TSTM WND GST 2 NW DIXON 41.76N 90.81W
07/09/2007 E60 MPH SCOTT IA TRAINED SPOTTER
TIME ESTIMATED. CORNFIELD FLATTENED. HEAVY RAIN...WITH 1
INCH IN 25 MINUTES. SMALL BRANCHES DOWN.
&&SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 711 PM CDT MON JUL 9 2007 IAZ065-066-068-100215- CEDAR-CLINTON-SCOTT- INCLUDING THE CITIES OF...TIPTON...CLINTON...BETTENDORF... DAVENPORT 711 PM CDT MON JUL 9 2007 ...THUNDERSTORMS WITH HEAVY RAIN... A NARROW BAND OF THUNDERSTORMS WITH HEAVY RAIN REMAINS NEARLY STATIONARY ALONG A LINE FROM ROUGHLY BENNETT TO CLINTON. PONDING OF WATER ON ROADS AND LOW LYING AREAS IS LIKELY OVER THE NEXT FEW HOURS. SIGNIFICANT RISES CAN BE EXPECTED ON BENNETT...BARBER... WALNUT...BROPHYS...AND AMES CREEKS.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
712 PM CDT MON JUL 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HEAVY RAIN 2 NE FULTON 41.89N 90.13W
07/09/2007 E1.75 INCH WHITESIDE IL TRAINED SPOTTER
RAINFALL SINCE 620 PM. ALSO HAD WIND GUSTS AROUND 50 MPH
WHICH DOWNED BRANCHES ABOUT 2 INCHES IN DIAMETER.
&&The Quad Cities radar (KDVN), 78 km away, was scanning. The volume nearest the first event began at 00:32 UTC.
1 flash flood. Local standard time, as filed.
A gravel and dirt road washed onto route 78 near Blue Mountain Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2007Every state in 2007This day in weather historyWarnings in Illinois, July 2007
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: 47349.