A cold front moved through eastern Iowa, northeast Missouri, and northwest Illinois during the evening hours of September 30th producing showers and thunderstorms. Some of the thunderstorms were severe producing damaging winds of 60 to 70 mph and isolated nickel sized hail.
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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.
A cold front moved through eastern Iowa, northeast Missouri, and northwest Illinois during the evening hours of September 30th producing showers and thunderstorms. Some of the thunderstorms were severe producing damaging winds of 60 to 70 mph and isolated nickel sized hail.
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 30, 2:20 PM CST, 3 hours 34 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 320 PM CDT SUN SEP 30 2007 .SYNOPSIS... VIGOROUS MID LEVEL SHORTWAVE WAS LOCATED OVER NE WITH ATTENDANT SFC LOW POSITIONED NEAR COLUMBUS NE AT 19Z WITH COLD FRONT AND DRYLINE IN PROCESS OF MERGING FROM CENTRAL/EASTERN KS THROUGH NORTHWEST OK. NARROW SQUALL LINE HAS DEVELOPED IN ADVANCE OF COLD FRONT/DRYLINE MERGE AND WAS RACING E/NE AT OVER 40 KTS WITH SEVERAL REPORTS OF 50- 60 MPH WINDS. MEANWHILE...NEXT MID LEVEL DISTURBANCE IN HIGH AMPLITUDE AND PROGRESSIVE FLOW WAS LOCATED OFF THE BC AND WA/OR COAST...AND WILL TAKE AIM ON LOCAL AREA TUE. && .SHORT TERM...TONIGHT... MAIN CHALLENGE IS WITH PCPN CHCS AND SEVERE WEATHER POTENTIAL THIS EVE. MID LEVEL SHORTWAVE OVER NE WILL MOVE QUICKLY E AND ACROSS CWA ... MAINLY NORTH HALF... LATE THIS EVE AND OVRNGT. LINE OF CONVECTION WILL SWEEP ACROSS MUCH OF AREA THIS EVE IN ADVANCE OF SHORTWAVE AND MERGING COLD FRONT/DRYLINE... AND WILL BE ACCOMPANIED BY STRONG GUSTY WINDS AND BRIEF DOWNPOURS WITH QUICK 0.20-0.30 OF RAIN. DESPITE DELAYED TIMING POTENTIAL STILL FOR SOME DAMAGING WINDS GIVEN STRONG LOW LEVEL FLOW AND DEEP LAYER SHEAR IN EXCESS OF 60 KTS... WITH GREATEST THREAT IN THE SOUTH/WEST COUNTIES. EXPECT SOMEWHAT OF LULL IN PCPN WITH POTENTIAL FOR EVEN PERIOD OF CLEARING LATE THIS EVE INTO EARLY OVRNGT BEFORE CHC FOR SOME SHOWERS WITH WRAP AROUND ESPECIALLY NORTHWEST HALF OR SO OF CWA BASED ON TRACK OF VORT MAX. COLD ADVECTION DELAYED WITH SYSTEM WRAPPING UP OVERHEAD AND WITH CLOUDS NUDGED UP MINS MANY LOCATIONS. ..05.. .LONG TERM... MONDAY THROUGH TUESDAY NIGHT...LATEST SHORT RANGE MODELS SUGGEST THAT WHILE DEPARTING SYSTEM STARTING TO OPEN UP ON MONDAY...IT STILL WILL BE VERTICALLY STACKED AND WOUND UP ENOUGH TO CONTINUE WRAP AROUND SHOWERS/SPRINKLES IN STRATACU FIELD ACRS AT LEAST THE NORTHEAST THIRD TO HALF OF THE FCST AREA THROUGH LATE MON MORNING. SUBSIDENCE AND CLEARING TO THEN ERODE CU FIELD FROM WEST TO EAST... WITH AREAS THAT RECEIVE ENOUGH INSOLATION WARMING AT LEAST INTO THE MID 70S...WITH A FEW LOCATIONS GETTING INTO THE UPPER 70S AND WILL SIDE WITH THE WARMEST OF GUIDANCE/MAV/. THE NEXT MAIN WX MAKER THIS PERIOD IS A RATHER VIGOROUS WAVE RIPPLING THROUGH MEAN WESTERLIES AND THE 12Z RUN MODELS ARE NOW ALL MORE PROGRESSIVE WITH...ALTHOUGH THE NAM REMAINS THE SLOWEST. ANOTHER NARROW MOISTURE RETURN RIBBON UP ALONG INCOMING FRONT FOR SOME BUOYANCY...AND STRONG AMBIENT WIND FIELD/BUT NOT AS STRONG AS THIS AFTERNOON/ AND SHEAR ARRIVING IN OR JUST PAST PEAK HEATING PERIOD...COULD BRING ABOUT ANOTHER SVR WX THREAT. MUCH WILL DEPEND ON LLVL MOISTURE/SFC DPT RETURN AND FRONTAL TIMING FOR PRE-HEATING...BUT FOR NOW WILL SIDE WITH THE MAJORITY OF THE MODELS/MORE PROGRESSIVE SOLUTIONS AND MAINTAIN LIKELY POPS TUE AFTERNOON INTO THE EARLY EVENING FROM WEST-TO-EAST ACCORDINGLY WITH THE FRONTAL PROGRESSION. EARLIER CLEAR OUT LATER TUE NIGHT WOULD SUPPORT THE COOLEST OF LOW TEMP GUIDANCE FOR EARLY WED MORNING...BUT WILL SIDE WITH A BLEND FOR NOW WHICH MEANS WIDESPREAD LOW TO MID 50S. IN THE EXTENDED/WED-SUN/...LATEST SUITE OF MEDIUM RANGE MODELS ARE ADVERTISING BRIEF BOUT OF LLVL RIDGING FOLLOWING UPPER TROF PASSAGE ON WED...BUT ARE NOT QUITE AS COLD ON THE GLANCING BLOW OF H85 MB COOL POOL...ESPECIALLY THE 00Z ECMWF. THUS LOOKS LIKE WIDESPREAD MID TO UPPER 70S. MEDIUM RANGE ENSEMBLES STILL SUGGEST GULF OF AK WAVE DUMP TO CARVE OUT AND RE-ESTABLISH BROAD UPPER TROF ACRS THE INTERMOUNTAIN WEST BY WEEKS END. THUS WITH INCREASING RETURN FLOW BETWEEN THAT PROCESS AND LARGE ATLANTIC SEABOARD RIDGE... THERMAL MODERATION WILL CONTINUE INTO THE START OF THE WEEKEND. THE 00Z ECMWF AND EVEN THE NEW GFS SHOWING SIGNS OF GENERATING ELEVATED WAA SHOWERS AND A FEW STORMS THU NIGHT. FOR NOW WILL ADD SLIGHT CHC POPS IN THE NORTHWESTERN CWA IN FAVORED ELEVATED CONVERGENT WAA WING. EXTENT OF WARMING AND MIXING ON FRI STILL APPEARS COULD TRANSLATE INTO WELL ABOVE NORMAL HIGHS IN THE MID TO UPPER 80S AND WILL TREND UP ONGOING TEMPS A CATEGORY. ENCROACHING SOUTHWESTERLY STORM TRACK WILL EVENTUALLY MEAN ANOTHER COLD FRONTAL PASSAGE...ITS JUST TIMING/PHASING ISSUES AND GULF MOISTURE RETURN THAT WILL ALL HAVE TO COME TOGETHER WITH SOME RUN-TO-RUN CONSISTENCY TO HI-LITE A CONVECTIVE WINDOW WITH MORE CONFIDENCE/HIGHER POPS. THE 12Z GFS AND NEW HIRES ECMWF SUGGEST MAIN FROPA SAT NIGHT NOW WHICH WILL MEAN A SHOWER AND THUNDERSTORM THREAT LATE SAT AFTERNOON AND EVENING AND WILL MAINTAIN SLIGHT CHC POPS SAT...BUT BUMP UP TO 30 POPS SAT NIGHT EXPECTING A SLOW DOWN IN ADDITIONAL RUNS. MODELS VARY ON POST- FRONTAL CAA WITH THE GFS MUCH MORE BULLISH WITH NEG H85 MB TEMPS INFILTRATING THE CWA BY SUNDAY AFTERNOON...WHILE THE ECMWF RANGES FROM +5 TO +10 C. EVEN WITH THE MILDER MODEL SOLUTION...NEXT SUNDAY LOOKING LIKE A BLUSTERY AND RATHER RAW DAY WITH NORTHWEST WINDS OF 15 TO 25 MPH IN PRESSURE GRADIENT BETWEEN STILL DEEPENING NORTHERN GRT LKS CYCLONE AND IN-COMING CANADIAN HIGH...CLOUD COVER/POST- FRONTAL SHOWERS...AND TEMPS POSSIBLY NOT MAKING IT OUT OF THE 50S. ..12.. && .AVIATION... LINE OF SHOWERS/TSTMS WILL SWEEP ACROSS THE TERMINALS THIS EVE AHEAD OF COLD FRONT/DRYLINE PASSAGE. LINE WILL BE ACCOMPANIED BY STRONG GUSTY WINDS POSSIBLY IN EXCESS OF 35-40 KTS. CIGS IN VFR WITH LINE BUT MVFR VSBYS AND VERY LOW POTENTIAL FOR IFR VSBYS GIVEN BRIEF HEAVY RAIN AND STRONG SFC WINDS. WINDS TO SHIFT TO SWLY AFTER LINE MOVES THROUGH WITH GUSTS AROUND 20 KTS OR SO...THEN SHIFT GRADUAL TO NWLY OVRNGT WHICH WILL BRING IN LOW CLOUDS AND MVFR CIGS MAINLY ALONG AND NORTH OF I 80 WITH SOME SHOWERS AND POTENTIAL FOR IFR CIGS. CIGS EXPECTED TO LIFT INTO VFR CAT FROM WEST TO EAST AFT 12Z. ..05.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && 05/12
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 525 AM CDT SUN SEP 30 2007 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-011030- 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- 525 AM CDT SUN SEP 30 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 RISK OF SEVERE THUNDERSTORMS FOR AREAS ALONG AND WEST OF A LINE RUNNING THROUGH DUBUQUE...THE QUAD CITIES AND MACOMB. THE GREATEST RISK OF SEVERE THUNDERSTORMS WILL BE DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. THE MAIN SEVERE WEATHER THREAT IS DAMAGING THUNDERSTORM WINDS. A COLD FRONT MOVING THROUGH THE REGION THIS AFTERNOON AND THIS EVENING WILL TRIGGER A NARROW AND FAST MOVING LINE OF STRONG THUNDERSTORMS. THE STORMS ARE EXPECTED TO MOVE THROUGH EASTERN IOWA AND NORTHEAST MISSOURI BETWEEN 4 PM AND 7 PM AND THROUGH THE ILLINOIS COUNTIES BETWEEN 7 PM AND 10 PM. THE DAYTIME HEATING WILL PROVIDE THE NECESSARY INSTABILITY FOR THE SOME OF THE STORMS WEST OF THE MISSISSIPPI RIVER TO BECOME SEVERE...PRODUCING WINDS IN EXCESS OF 60 MPH. BY THE TIME THE THUNDERSTORMS MOVE EAST OF THE RIVER...THEY WILL HAVE WEAKENED ENOUGH TO LIMIT THE SEVERE THREAT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY MORE STRONG THUNDERSTORMS ARE EXPECTED TUESDAY AND TUESDAY NIGHT AS ANOTHER POTENT STORM SYSTEM MOVES THROUGH THE MIDWEST. THE TIMING OF THUNDERSTORMS AND THE STRENGTH OF THE SYSTEM WILL BE FAVORABLE FOR SEVERE THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON AND EARLY THIS EVENING.
The Quad Cities radar (KDVN), 96 km away, was scanning. The volume nearest the first event began at 23:52 UTC.
16 thunderstorm wind, 1 hail. Local standard time, as filed.
Winds estimated to be 70 mph blew down numerous trees and tree limbs up to 6 inches in diameter in F.W. Kent Park. Report provided by Johnson County Conservation Board.
A truck driver estimated nickel size hail on Interstate 80 west of Oxford, IA near mile marker 230.
A truck driver estimated 70 mph winds on Interstate 80 west of Oxford, IA near mile marker 230.
A spotter estimated winds to be 60 mph in Cedar Rapids, IA.
Winds estimated to be 70 mph blew a portion of a roof of an industrial building off near the 4000 block of J Street SW in Cedar Rapids, IA.
Winds estimated to be 60 mph blew down some tree branches in Anamosa, IA.|
Winds estimated to be 60 mph blew down several branches in Mechanicsville, IA. Time estimated.
Winds were estimated to be 60 mph in Anamosa, IA.|
Winds estimated to be 65 mph blew down a tree onto a building on the south side of Anamosa, IA.
Winds estimated to be 70 mph blew a portion of a roof of a mobile home off near Wayland, IA. Time estimated.
Winds estimated to be 60 to 70 mph blew down one foot diameter tree limbs as well as power lines in Lone Tree, IA. Time estimated.
Winds estimated to be 65 mph blew down a tree limb in Columbus Junction, IA.
Winds estimated to be 65 mph blew down an 8 inch diameter tree in Muscatine, IA.
Winds were estimated to be 60 mph at the NWS Office in Davenport, IA.
Winds estimated to be 60 mph blew down several 1 to 3 inch diameter tree limbs and branches in De Witt, IA.|
Winds were estimated to be 60 mph in De Witt, IA.
Winds estimated to be 60 mph blew down some tree branches 3 to 4 inches in diameter about 4 miles east of De Witt, IA. Time estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2007Every state in 2007This day in weather historyWarnings in Iowa, September 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: 59309, 59310, 59311, 59312, 59313, 59314, 59315, 59316, 59325, 59317, 59318, 59319, 59320, 59321, 59322, 59323, 59324.