Heavy rains resulted in minor flash flooding of some streets and parking lots in Davenport, IA during the early afternoon of August 7. Locust Street was reduced to one lane due to the flood waters.
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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.
Heavy rains resulted in minor flash flooding of some streets and parking lots in Davenport, IA during the early afternoon of August 7. Locust Street was reduced to one lane due to the flood waters. In addition, water flooded a nearby St Ambrose University parking lot.
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 Aug 7, 6:20 AM CST, 5 hours 31 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 720 AM CDT FRI AUG 7 2009 .UPDATE... WITH LEAD CONVERGENT WINGS OF THTA-E ADVECTION ON VEERING LLJ STILL INCREASING OVER THE NORTH HALF OF THE CWA AND THE MCS OVER SOUTHWEST IA TAKING AIM AT THE SOUTH HALF...HAVE DONE A QUICK UPDATE TO BLANKET THE ENTIRE FCST AREA WITH CATEGORICAL POPS FOR OCCASIONAL SHOWERS AND STORMS THROUGH 18Z. WITH SOUTHERLY FEED OF RICH THTA-E AIRMASS AND INCREASING PW/S...HEAVY RAIN A THREAT FOR MOST OF THE AREA EVEN THIS MORNING. SVR THREAT AND POTENTIAL FOR SOUTHERN FLANK OF INCOMING MCS FLARING UP ACRS THE SOUTH THROUGH LATE MORNING AND MIDDAY SOMEWHAT UNCLEAR AT THIS POINT...ALL DEPENDANT ON MAINTENANCE OF LLJ AND DEVELOPING SHEAR PROFILES IN VCNTY OF MAIN WARM FRONT TRYING TO RETREAT NORTHWARD. LATEST ANALYSIS IS SUGGESTING THE WARM FRONT HAS MADE IT TO THE WESTERN IA/MO BORDER REGION...BUT IS SAGGING SOUTHEASTWARD FROM THERE TOWARD THE STL AREA AND INTO SOUTHWESTERN IL. BEST SVR THREAT THROUGH EARLY AFTERNOON MAY BE ALONG AND SOUTH OF THIS BOUNDARY ACRS MO INTO SW IL...MAINLY SOUTH OF THE DVN CWA. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE IL...NONE MO...NONE. && 12
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 450 AM CDT FRI AUG 7 2009 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-081000- BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO- CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL- HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA- JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA- MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL- SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL- WASHINGTON IA-WHITESIDE IL- 450 AM CDT FRI AUG 7 2009 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 AS A WARM FRONT LIFTS NORTHWARD ACROSS THE REGION...THE OUTLOOK AREA WILL BE SUSCEPTIBLE TO SEVERAL ROUNDS OF STRONG TO SEVERE THUNDERSTORMS AND HEAVY RAINFALL TODAY AND TONIGHT. SCATTERED THUNDERSTORMS POSSIBLY WITH SOME SMALL HAIL WILL AFFECT AREAS ALONG AND WEST OF THE MISSISSIPPI RIVER EARLY THIS MORNING. A LARGER COMPLEX OF THUNDERSTORMS WILL MOVE OUT OF NEBRASKA AND ACROSS MUCH OF THE OUTLOOK AREA FROM MID MORNING THROUGH EARLY AFTERNOON. THESE STORMS WILL PRODUCE LOCALLY HEAVY RAIN AT RATES OF OVER AN INCH AN HOUR. ALSO...SOME OF THESE STORMS MAY STRENGTHEN THROUGH MIDDAY AND BE ABLE TO PRODUCE LARGE HAIL AND GUSTY WINDS ESPECIALLY ALONG AND SOUTH OF INTERSTATE 80. A GREATER RISK FOR SEVERE STORMS WILL COME LATER THIS AFTERNOON AND EVENING AS STORMS REFIRE AND DEVELOP ON LINGERING FRONTAL BOUNDARIES. LARGE HAIL UP TO THE SIZE OF PING PONG BALLS...AND DAMAGING WINDS IN EXCESS OF 65 MPH WILL BE THE PRIMARY THREATS. IF A LARGE SINGULAR STORM CAN FORM ON A BOUNDARY...THERE WILL ALSO BE THE POSSIBILITY OF A TORNADO. LATEST INDICATIONS SUGGEST THAT THE GREATEST THREAT FOR THESE LATE DAY AND EVENING SEVERE STORMS WILL BE ALONG AND NORTH OF THE INTERSTATE 80 CORRIDOR. LOCALLY HEAVY RAIN WILL CONTINUE TO BE A MAJOR FACTOR...WITH STORMS POSSIBLY PRODUCING 1 TO 3 INCHES OF RAINFALL IN A SHORT TIME WHICH MAY LEAD TO FLASH FLOODING. AREAS OF REPEATED STORM ACTIVITY WILL BE SUSCEPTIBLE TO WIDESPREAD FLOODING BY MIDNIGHT TONIGHT. THE STORM PREDICTION CENTER HAS ALMOST THE ENTIRE OUTLOOK AREA UNDER A SLIGHT RISK FOR SEVERE WEATHER TODAY AND TONIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH WEDNESDAY THERE WILL CONTINUE TO BE A THREAT OF SCATTERED THUNDERSTORMS SATURDAY MORNING. ISOLATED STRONG STORMS MAY BE CAPABLE OF PRODUCING LARGE HAIL AND HEAVY RAINFALL. VERY WARM AND HUMID CONDITIONS CAN BE EXPECTED SATURDAY AFTERNOON AND EVENING...WITH HEAT INDEX READINGS AROUND 100 DEGREES. SUNDAY...DANGEROUS HEAT IS LIKELY...WITH TEMPERATURES OF 90 TO 96 COMBINING WITH HUMID CONDITIONS TO PRODUCE HEAT INDEX READINGS BETWEEN 100 AND 105 DEGREES. LOCALLY HIGHER HEAT INDEX READINGS AROUND 110 DEGREES WILL BE POSSIBLE. SUNDAY NIGHT...STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE OVER THE ENTIRE OUTLOOK AREA AS A COLD FRONT MOVES INTO THE REGION. AT THIS TIME...THE PRIMARY THREAT APPEARS TO BE DAMAGING WIND...ALONG WITH HEAVY RAINFALL. THE STORM PREDICTION CENTER HAS THE ENTIRE OUTLOOK AREA IN A SLIGHT RISK FOR SEVERE STORMS SUNDAY NIGHT. THERE WILL BE A THREAT FOR ADDITIONAL THUNDERSTORMS THROUGH TUESDAY AS THE FRONT SLOWLY MOVES THROUGH THE AREA. THE EXACT THREATS FOR THESE STORMS WILL BECOME MORE CLEAR IN THE COMING DAYS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT. PLEASE REPORT ANY SEVERE WEATHER AND HEAVY RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE. 12/ERVIN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1134 AM CDT FRI AUG 07 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1132 AM HEAVY RAIN 6 NE DAVENPORT 41.62N 90.52W
08/07/2009 M1.84 INCH SCOTT IA NWS EMPLOYEE
IN NORTHEAST DAVENPORT. STILL RAINING.
&&
DLSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1146 AM CDT FRI AUG 07 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1145 AM HEAVY RAIN 1 WSW SHERRARD 41.31N 90.53W
08/07/2009 E1.60 INCH MERCER IL TRAINED SPOTTER
RAINFALL SINCE 8 AM.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1206 PM CDT FRI AUG 07 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1206 PM HEAVY RAIN LOWDEN 41.86N 90.92W
08/07/2009 M2.47 INCH CEDAR IA CO-OP OBSERVER
STORM TOTAL
&&
DMDSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1213 PM CDT FRI AUG 7 2009 ILZ016>018-071830- HENRY IL-BUREAU-PUTNAM- INCLUDING THE CITIES OF...KEWANEE...PRINCETON...HENNEPIN 1213 PM CDT FRI AUG 7 2009 ...LINE OF STRONG THUNDERSTORMS WITH HEAVY RAINFALL MOVING THROUGH EARLY THIS AFTERNOON... AT NOON CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF THUNDERSTORMS WITH VERY HEAVY RAINFALL AND STRONG GUSTY WINDS EXTENDING FROM PROPHETSTOWN TO GALVA. THESE STORMS WERE MOVING EAST AROUND 40 MPH AND WILL PRODUCE TORRENTIAL RAINFALL AND WIND GUSTS TO 40 MPH ALONG THE INTERSTATE 80 CORRIDOR FROM ANNAWAN TO PRINCETON THROUGH 1 PM. RAINFALL AMOUNTS UP TO 1 INCH IN LESS THAN A HALF HOUR WILL PRODUCE PONDING OF WATER ON ROADWAWYS AND STANDING WATER IN FLOOD PRONE AREAS. ALSO...HEAVY RAIN WILL CAUSE AREAS OF POOR VISIBILITY. MOTORISTS SHOULD SLOW DOWN WHEN DRIVING THROUGH HEAVY RAIN AND REMEMBER TO USE HEADLIGHTS. NEVER DRIVE THROUGH FLOODED ROADWAYS. SHEETS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1237 PM CDT FRI AUG 07 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1230 PM HEAVY RAIN DUBUQUE REGIONAL AIRPOR 42.40N 90.72W
08/07/2009 M0.73 INCH DUBUQUE IA ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
1230 PM HEAVY RAIN IOWA CITY MUNICIPAL AIR 41.63N 91.55W
08/07/2009 M1.16 INCH JOHNSON IA ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
1230 PM HEAVY RAIN CEDAR RAPIDS MUNICIPAL 41.88N 91.72W
08/07/2009 M1.89 INCH LINN IA ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
1230 PM HEAVY RAIN MOLINE QUAD-CITY AIRPOR 41.45N 90.50W
08/07/2009 M1.86 INCH ROCK ISLAND IL ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
1230 PM HEAVY RAIN BURLINGTON REGIONAL AIR 40.78N 91.13W
08/07/2009 M0.81 INCH DES MOINES IA ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
1230 PM HEAVY RAIN DAVENPORT MUNICIPAL AIR 41.62N 90.58W
08/07/2009 M1.55 INCH SCOTT IA ASOS
OFFICIAL OBSERVATION. RAINFALL TOTAL SO FAR.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1249 PM CDT FRI AUG 07 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1214 PM LIGHTNING GALVA 41.17N 90.04W
08/07/2009 HENRY IL TRAINED SPOTTER
LIGHTNING STUCK A TRANSFORMER. POWER OUTAGE ON THE
SOUTHEAST SIDE OF TOWN. TIME ESTIMATED.
1240 PM HEAVY RAIN GALVA 41.17N 90.04W
08/07/2009 E1.50 INCH HENRY IL TRAINED SPOTTER
RAINFALL TOTAL SO FAR.
&&The Quad Cities radar (KDVN), 7 km away, was scanning. The volume nearest the first event began at 17:51 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains resulted in minor flash flooding of some streets and parking lots in Davenport, IA during the early afternoon of August 7. Locust Street was reduced to one lane due to the flood waters. In addition, water flooded a nearby St Ambrose University parking lot.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2009Every state in 2009This day in weather historyWarnings in Iowa, August 2009
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: 192117.