Low pressure interacted with a moist to near tropical atmosphere as it moved from northwest Missouri into southeast Iowa during maximum heating. A line of thunderstorms developed along the Mississippi River and moved into Illinois.
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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.
Low pressure interacted with a moist to near tropical atmosphere as it moved from northwest Missouri into southeast Iowa during maximum heating. A line of thunderstorms developed along the Mississippi River and moved into Illinois. Outflow boundaries from these storms provided the focus for additional storm development into the evening and overnight hours. The combination of slow moving storms and storms moving over the same areas lead to high rainfalls and one case of localized flash flooding.
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 Sep 11, 11:09 AM CST, 2 hours 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1209 PM CDT MON SEP 11 2006 .UPDATE... SURFACE LOW WAS OVER S CENTRAL IA AT 16Z WITH WARM FRONT ARCING E-SE ACROSS SOUTHEAST SE IA FROM ABOUT OTM THROUGH MQB. VISIBLE SATELLITE SHOWED DRY SLOT AND CLEARING OF LOW CLOUDS WRAPPING NORTH INTO THE WARM SECTOR ALONG AND EAST OF MS RIVER. AT UPPER LEVELS...SHORTWAVE TROUGH EMBEDDED IN LARGER SCALE N CENTRAL CONUS POSITIVE TILT TROUGH WAS MOVING THROUGH CENTRAL CWA WITH EMBEDDED MESOSCALE VORTS ENHANCING SHOWERS NEAR DBQ AND EOK. WITH SHOWERS ON-GOING OVER HWY 20 CORRIDOR...WILL KEEP CURRENT FLASH FLOOD WATCH GOING FOR NOW...BUT WILL CONSIDER DROPPING EARLY AS MID LEVEL DEFORMATION ZONE APPEARS TO BE LIFTING NORTHEAST LEAVING THIS AREA IN MORE -RA/DZ TYPE PRECIPITATION FOR THIS AFTERNOON AND REDUCED THREAT FOR FLOODING. INSOLATION OCCURRING IN WARM SECTOR OF SE CWA AHEAD OF ADVANCING SURFACE LOW WILL NEED TO BE WATCHED THIS AFTERNOON AS IT LEADS TO FURTHER DESTABILIZATION AND EXPECT FURTHER THUNDERSTORM DEVELOPMENT THERE. MID LEVEL DRY SLOT SWEEPING IN FROM WEST...ALONG WITH MARGINAL SHEAR AND SUFFICIENT LOW LEVEL INSTABILITY COULD LEAD TO SEVERE THUNDERSTORM DEVELOPMENT THERE AND AREA IS IN SPC DAY 1 SLIGHT RISK. GRIDS/FORECASTS UPDATED TO TONE DOWN POPS IN W-NW HALF CWA AND WILL LIKELY UPDATE AGAIN EARLY IN AFTERNOON TO FURTHER REMOVE THUNDER POTENTIAL AND CHANGE TO MORE STRATIFORM TYPE PRECIPITATION AS SYSTEM MOVES EAST. AVIATION FORECAST WILL CONTINUE WIDESPREAD IFR CONDITIONS AT CID AND DBQ SPREADING INTO MLI AND BRL WITH OCCASIONAL LIFR LIKELY OVERNIGHT INTO EARLY TUE OVER ENTIRE AREA WITH LACK OF MECHANISM SEEN TO SWEEP OUT LOW LEVEL MOISTURE. ..SHEETS.. && .PREV DISCUSSION... (ISSUED 325 AM CDT MON SEP 11 2006) DISCUSSION... 06Z SURFACE ANALYSIS SHOWED STATIONARY FRONT MEANDERING ACROSS CENTRAL AND SOUTHERN MO INTO SRN IL WITH WAVE/INVERTED TROF FROM WRN MO INTO SW IA. H5 TROF WAS LOCATED ALONG THE MO RIVER OVER WRN IA AND ERN NE. S/W WAS ALSO NOTED OVER ERN MT DIVING SE TOWARD MID MO RIVER VALLEY. SHRA/ISOLD TSRA WAS OCCURRING ALONG THE INVERTED TROF FROM N CNTRL INTO NERN IA AND SERN MN. ANOTHER AREA OF SHRA/TSRA WAS ON GOING ACROSS NRN MO...SRN IA AND W CTNRL IL AHEAD OF THE SURFACE WAVE. PCPN TRENDS TODAY THROUGH TUESDAY NIGHT WILL BE THE MAIN CONCERN AS SURFACE WAVE INVERTED TROF MOVES THROUGH CWA TODAY AND NRN PLAINS S/W PHASES WITH MAIN H5 OVER MID MS VALLEY TONIGHT. BULK OF REMAINING PCPN SHOULD FALL OVER CWA TODAY BEFORE BEST FORCING AND DEEP MOISTURE ARE PUSHED EAST AHEAD OF THE MID LEVEL TROF. FLOOD WATCH IN PLACE OVER NWRN CWA WILL BE MAINTAINED WITH AREA ALREADY RECEIVING NEARLY 3 INCHES OF RAIN YESTERDAY (2.9 INCHES AT MANCHESTER RIVER GAGE AS OF 06Z) AND POTENTIAL FOR ISOLATED INCH OR SO THROUGH MID AFTERNOON. MAY ALSO SEE SOME LOCALLY HEAVY AMOUNTS IN THE SOUTH OF HIGHWAY 34 TODAY AS SURFACE WAVE MOVES THROUGH. FAR SOUTH WILL ALSO HAVE TO BE WATCHED FOR STRONG TSRA WITH AIRMASS DESTABILIZING AHEAD OF SURFACE LOW AND MID LEVEL DRY PUNCH PROGGED TO WORK IN OVER NRN MO THIS AFTERNOON. AT THIS POINT BELIEVE STORMS SHOULD NOT BE SEVERE BUT COULD PRODUCE SOME SMALL HAIL DURING THE AFTERNOON. AFTER THIS AFTERNOON PCPN SHOULD BECOME RELATIVELY LIGHT AND MORE SCATTERED OVER THE CWA AS BEST FORCING AND MOISTURE SHIFT TO THE EAST AND MID LEVEL TROF DIGS OVER THE REGION. PCPN SHOULD TAPER OFF FROM WEST TO EAST TUESDAY NIGHT AS UPPER TROF MOVES EAST OF CWA WITH DRY WX EXPECTED FOR MID WEEK. TEMPS WILL BE BELOW NORMAL TODAY THROUGH WEDNESDAY WITH CLOUDS AND PCPN KEEPING MAX TS IN THE 60S TO LOW 70S. LOOKS LIKE MINS IN THE MID TO UPPER 40S WILL BE POSSIBLE WEDNESDAY/THURSDAY MORNINGS AS SURFACE RIDGE MOVES THROUGH CWA. DLF && .DVN WATCHES/WARNINGS/ADVISORIES... IA...FLASH FLOOD WATCH UNTIL 4 PM THIS AFTERNOON ALONG U.S. HWY 20. IL...NONE. MO...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1246 PM CDT MON SEP 11 2006 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-121800- 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- 1246 PM CDT MON SEP 11 2006 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...THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON SOUTH OF INTERSTATE 80 IN ILLINOIS...EAST OF A LINE FROM WAPELLO TO FARMINGTON IN SOUTHEAST IOWA...AND OVER CLARK COUNTY IN NORTHEAST MISSOURI. THUNDERSTORMS ARE EXPECTED TO DEVELOP BY MID AFTERNOON IN A WARM AND MOIST AIRMASS AHEAD OF A LOW PRESSURE SYSTEM IN SOUTH CENTRAL IOWA. A FEW OF THESE STORMS MAY BECOME SEVERE...WITH THE MAIN THREATS BEING HAIL UP TO NICKEL SIZE AND DAMAGING WIND GUSTS IN THE SLIGHT RISK AREA. AN ISOLATED TORNADO IS POSSIBLE... MAINLY WHERE STORMS MAY INTERACT WITH A SURFACE WARM FRONT SOUTH OF INTERSTATE 80 IN ILLINOIS. THERE IS A LOW RISK FOR FLASH FLOODING ALONG THE HIGHWAY 20 CORRIDOR IN EASTERN IOWA AS ADDITIONAL SHOWERS FALL OVER NEARLY SATURATED SOILS. A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 PM FOR BUCHANAN...DELAWARE AND DUBUQUE COUNTIES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE OF THUNDERSTORMS AGAIN NEXT SATURDAY NIGHT AND SUNDAY. IT IS TOO EARLY TO DETERMINE IF SEVERE THUNDERSTORMS ARE POSSIBLE. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION MAY BE NEEDED BY MID AFTERNOON OVER WEST CENTRAL ILLINOIS AND FAR NORTHEAST MISSOURI. SHEETS
The Quad Cities radar (KDVN), 165 km away, was scanning. The volume nearest the first event began at 20:03 UTC.
1 lightning. Local standard time, as filed.
Sheriff department reports 80 hay bales on fire from lightning strikes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2006Every state in 2006This day in weather historyWarnings in Missouri, September 2006
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: 5534096.