An MCS moving through Iowa initiated isolated severe thunderstorms along its outflow boundary during the early afternoon hours. The intense line of storms on the south end of the MCS bowed out as it reached southeast Iowa and raced into west central Illinois and far northeast Missouri.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
An MCS moving through Iowa initiated isolated severe thunderstorms along its outflow boundary during the early afternoon hours. The intense line of storms on the south end of the MCS bowed out as it reached southeast Iowa and raced into west central Illinois and far northeast Missouri.
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 8, 2:00 PM CST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 300 PM CDT THU SEP 8 2005 .SYNOPSIS... WARM FRONT WAS OVER SOUTHERN IA EARLY THIS AFTERNOON WITH A SEVERE THUNDERSTORM COMPLEX RIDING THE BOUNDARY OVER EAST CENTRAL AND SOUTHEAST IOWA. TSTORMS FEEDING OFF M/U 80 TEMPS AND M/U60 DEWPOINTS SOUTH OF THE BOUNDARY OVER NRN MO AND SCNTRL IA. SO FAR IN EASTERN IA SEVERE STORMS HAVE BEEN PRODUCING DAMAGING WIND AND 1 TO 1.75 INCH HAIL. && .SHORT TERM...(TONIGHT AND THURSDAY)... MAIN CONCERN WILL BE WALKING CURRENT TSTORM COMPLEX OUT OF THE CWA. DISTANT TIME TOOL ON AWIPS SHOWS BACK EDGE OF COMPLEX MOVING SOUTHEAST AT 35 KTS. BASED ON THIS MOVEMENT TSTORMS SHOULD EXIT THE SOUTHEAST COUNTIES BETWEEN 23Z AND 01Z. THEN THE QUESTION IS WILL THERE BE ANY REDEVELOPMENT OVERNIGHT. CURRENT ACTIVITY SHOULD STABILIZE THE ATMOSPHERE FOR THE REST OF THE EVENING. HOWEVER...META IS SHOWING A THETA-E AXIS OVER CENTRAL IA WITH WEAK H8 FLOW CREATING SOME THETA-E ADVECTION LATE THIS EVENING AND OVERNIGHT. HAVE INCLUDED SLGT CHANCE WORDING ALONG AND EAST OF THE RIVER THROUGH 12Z TO COVER POSSIBILITY OF REDEVELOPMENT OF ELEVATED SHRA/TSRA OVERNIGHT. WARM FRONT LIFTS NE OF CWA BY FRIDAY MORNING ENDING PCPN THREAT. FRIDAY THROUGH SUNDAY WILL BE DRY. TEMPS WILL BE WARMING TO ABOVE NORMAL LEVELS FOR THE WEEKEND WITH S-SW LOW LEVEL FLOW SETTING UP OVER THE MIDWEST. ...DLF... && .LONG TERM...(SUNDAY NIGHT THROUGH THURSDAY)... LONG RANGE MODELS CONTINUE TO SHOW AMPLIFIED PATTERN OVER THE U.S. THROUGH THE PERIOD. UPPER RIDGE SLIDES EAST AS TROUGH BECOMES ESTABLISHED OVER THE WESTERN U.S. EARLY IN THE PERIOD...EXPECT DRY WEATHER AND WARMER THAN NORMAL TEMPS. SURFACE FRONT WILL BE MOVING SLOWLY EAST THROUGH THE CENTRAL AND NORTHERN PLAINS...SETTING UP GOOD FETCH OF S-SW WINDS OVER THE MS VALLEY MONDAY AND TUESDAY. HAVE BUMPED UP TEMPS SLIGHTLY DURING THIS PERIOD. WILL HAVE TO WAIT AND SEE HOW CLOUD TRENDS EVOLVE. IF WE HAVE MOSTLY SUNNY CONDITIONS BOTH DAYS THEN TIGHTENING SURFACE PRESSURE GRADIENT WILL ALLOW FOR DEEP MIXING...PUSHING TEMPS ABOVE CURRENT FCST. MODELS CONTINUE TO SHOW SOME DISAGREEMENT ON HOW FAST THE FRONT WILL MOVE THROUGH IA/NRN IL WEDNESDAY AND THURSDAY. THE ECMWF DRIVES THE BOUNDARY THROUGH QUICKLY...PLACING IT FROM NW IN THROUGH SW MO BY WEDNESDAY EVENING. WITH DEEP SOUTHWEST FLOW...STILL FEEL THAT THE ECMWF IS TOO FAST AND WILL USE THE GFS SOLUTION FOR WEDNESDAY AND THURSDAY. THE GFS SOLUTION MOVES THE BOUNDARY TO THE MS RIVER BY WEDNESDAY EVENING AND HOLDS IT THERE THROUGH THROUGH THURSDAY MORNING. IF THIS SOLUTION DOES VERIFY THEN THE BOUNDARY IN THE AREA SHOULD PROVIDE SEVERAL ROUNDS OF PCPN FOR THE REGION. THEREFORE HAVE UPPED POPS TO CHANCE CATEGORY FOR ALL AREAS FROM TUESDAY NIGHT THROUGH THURSDAY NIGHT. ...DLF... && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1200 PM CDT THU SEP 8 2005 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-091000- 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- 1200 PM CDT THU SEP 8 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL IOWA...SOUTHEAST IOWA...NORTHWEST ILLINOIS...NORTHEAST MISSOURI... NORTHEAST IOWA...WEST CENTRAL ILLINOIS AND NORTH CENTRAL ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT A THUNDERSTORM COMPLEX OVER NORTHWEST IOWA WILL MOVE ACROSS THE AREA THIS AFTERNOON AND EVENING. AFTERNOON HEATING WILL ALLOW FOR SOME OF THE STORMS TO REACH SEVERE LEVELS INTO THE MID EVENING HOURS. THE GREATEST RISK WILL BE LARGE HAIL...POSSIBLY UP TO THE SIZE OF GOLFBALLS AND DAMAGING WINDS OF 60 TO POSSIBLY 70 MPH. AN ISOLATED BRIEF TORNADO IS ALSO POSSIBLE. THE LOCATIONS MOST AT RISK FOR SEVERE WEATHER WILL BE ALONG AND ESPECIALLY SOUTH OF A VINTON IOWA TO CEDAR RAPIDS TO GREATER QUAD CITIES TO HENNEPIN ILLINOIS LINE BETWEEN 2 PM AND 10 PM THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE SOUTH OF A VINTON IOWA TO QUAD CITIES TO HENNEPIN ILLINOIS AXIS...MAINLY BETWEEN 2 AND 10 PM. PLEASE RELAY ANY NEAR SEVERE TO SEVERE REPORTS TO THE NOAA NWS OFFICE IN THE QUAD CITIES. NICHOLS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
233 PM CDT THU SEP 08 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0205 PM TSTM WND DMG PACKWOOD 41.13N 92.08W
09/08/2005 JEFFERSON IA EMERGENCY MNGR
TREE BRANCHES TO 6 INCHES IN DIAMETER DOWN IN THE
PACKWOOD AREA.
&&
MDBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
238 PM CDT THU SEP 08 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0225 PM TSTM WND DMG FAIRFIELD 41.01N 91.97W
09/08/2005 JEFFERSON IA BROADCAST MEDIA
SOME TREE BRANCHES DOWN AND PONDING WATER ON THE ROADS.
PEA SIZE HAIL ALSO REPORTED.
&&
MDBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
246 PM CDT THU SEP 08 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0205 PM HAIL PACKWOOD 41.13N 92.08W
09/08/2005 1.75 INCH JEFFERSON IA EMERGENCY MNGR
NICKEL TO GOLF BALL SIZE HAIL REPORTED.
&&
MDBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
339 PM CDT THU SEP 08 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0336 PM HEAVY RAIN 6 S WASHINGTON 41.21N 91.69W
09/08/2005 0.70 INCH WASHINGTON IA TRAINED SPOTTER
0.70 INCHES OF RAIN FROM 250 TO 315 PM.
&&
MDBSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 342 PM CDT THU SEP 8 2005 IAZ051>053-066-082145- BENTON IA-CLINTON IA-JONES IA-LINN IA- THE NATIONAL WEATHER SERVICE HAS CANCELED SEVERE THUNDERSTORM WATCH 775 FOR THE FOLLOWING AREAS IN IOWA THIS CANCELS 4 COUNTIES IN EAST CENTRAL IOWA BENTON CLINTON JONES LINN THIS INCLUDES THE CITIES OF...ANAMOSA...CEDAR RAPIDS... CLINTON AND VINTON. IAZ063>065-067>068-076>078-087>089-098>099- ILZ009-015>018-024>026-034>035- MOZ009>010-090000- CEDAR IA-DES MOINES IA-HENRY IA-IOWA IA-JEFFERSON IA- JOHNSON IA-KEOKUK IA-LEE IA-LOUISA IA-MUSCATINE IA- SCOTT IA-VAN BUREN IA-WASHINGTON IA-BUREAU IL- HANCOCK IL-HENDERSON IL-HENRY IL-MCDONOUGH IL- MERCER IL-PUTNAM IL-ROCK ISLAND IL-WARREN IL- WHITESIDE IL-CLARK MO-SCOTLAND MO- SEVERE THUNDERSTORM WATCH NUMBER 775 REMAINS VALID UNTIL 7 PM CDT FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 10 COUNTIES IN NORTH CENTRAL ILLINOIS BUREAU PUTNAM IN NORTHWEST ILLINOIS HENRY MERCER ROCK ISLAND WHITESIDE IN WEST CENTRAL ILLINOIS HANCOCK HENDERSON MCDONOUGH WARREN IN IOWA THIS WATCH INCLUDES 13 COUNTIES IN EAST CENTRAL IOWA CEDAR IOWA JOHNSON MUSCATINE SCOTT IN SOUTHEAST IOWA DES MOINES HENRY JEFFERSON KEOKUK LEE LOUISA VAN BUREN WASHINGTON IN MISSOURI THIS WATCH INCLUDES 2 COUNTIES IN NORTHEAST MISSOURI CLARK SCOTLAND THIS INCLUDES THE CITIES OF...ALEDO...BETTENDORF...BURLINGTON... CARTHAGE...DAVENPORT...FAIRFIELD...FORT MADISON...HENNEPIN... IOWA CITY...KAHOKA...KEOSAUQUA...KEWANEE...MACOMB...MARENGO... MEMPHIS...MOLINE...MONMOUTH...MOUNT PLEASANT...MUSCATINE... OQUAWKA...PRINCETON...ROCK FALLS...ROCK ISLAND...SIGOURNEY... STERLING...TIPTON...WAPELLO AND WASHINGTON.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
359 PM CDT THU SEP 08 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0334 PM TSTM WND GST 2 W MIDDLETOWN 40.83N 91.30W
09/08/2005 40 MPH DES MOINES IA LAW ENFORCEMENT
40 MPH WIND GUST WEST OF MIDDLETOOWN.
0335 PM TSTM WND DMG 3 N ANSON 40.61N 91.77W
09/08/2005 CLARK MO TRAINED SPOTTER
12 INCH DIAMETER ASH TREE BLOWN DOWN. WIND ESTIMATED AT
AT LEAST 50 MPH.
&&
MDBThe Quad Cities radar (KDVN), 136 km away, was scanning. The volume nearest the first event began at 21:09 UTC.
4 thunderstorm wind, 2 heavy rain. Local standard time, as filed.
Illinois highway 96 covered with downed branches between Nauvoo and Hamilton.
1 inch of rain in 40 minutes.
At the intersection of highway 9 and 650th street. Trees and power lines down with water greater than curb deep.
Branches down on Western Illinois University campus and in other parts of the city. There was a report of a measured 57 knot (65 mph) wind gust with the storms.
Corn flattened in a field with many branches down. There was also 0.55 inch of rain in 15 minutes.
Heavy rain resulted in water collecting in many intersections that was greater than curb deep. Some cars stalled after trying to move through the water too quickly.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2005Every state in 2005This day in weather historyWarnings in Illinois, September 2005
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: 5479133, 5479132, 5479134, 5479137, 5479135, 5479136.