A large area of showers and thunderstorms moved across eastern Iowa during the early morning hours of September 7th with one storm near Winfield, IA producing damaging winds.
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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 large area of showers and thunderstorms moved across eastern Iowa during the early morning hours of September 7th with one storm near Winfield, IA producing damaging winds.
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 6, 2:05 PM CST, 12 hours 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 305 PM CDT THU SEP 6 2007 .SYNOPSIS... UPPER LEVEL LOW OVER MO WAS PRODUCING WIDESPREAD SHOWERS ACROSS THE REGION THIS AFTERNOON. THUNDERSTORMS SO FAR MAINLY CONFINED TO STRONGEST FORCING AHEAD NEAR STRONGER CIRCULATION CENTER OVER INTO WESTERN KY. WEAKER EMBEDDED VORT MAX WAS SEEN ON SATELLITE IMAGERY FURTHER NORTH...LIFTING INTO SE IA EARLY THIS AFTERNOON. SHOWERS WERE BECOMING MORE NUMEROUS ACROSS MAINLY THE WESTERN HALF OF DVN CWA AHEAD OF THIS FEATURE AS WE APPROACH PEAK DIURNAL HEATING. ANOTHER IMPORTANT FEATURE WAS SHORTWAVE TROUGH ANALYZED OVER SW WY AT 12Z...SEEN ON WV IMAGERY MOVING INTO NEB PANHANDLE AND WESTERN SD THIS AFTERNOON. AT THE SURFACE...BROAD SW FLOW AND TROPICAL MOISTURE REMAINED AHEAD OF STALLED FRONTAL BOUNDARY EXTENDING FROM NEB PANHANDLE TO NE MN. THIS FRONT GETS SWEPT THROUGH REGION TONIGHT BY THE PLAINS SHORTWAVE...RESULTING IN WIDESPREAD...MORE ORGANIZED THUNDERSTORMS LATE TONIGHT INTO FRI MORNING. && .SHORT TERM...TONIGHT THROUGH FRIDAY... CHANCES FOR RAIN AND THUNDERSTORMS ARE MAIN FOCUS. 12Z MODELS HAD POOR INITIALIZATION AND HANDLE ON THE SLOW MOVING UPPER LOW TO THE SOUTH...PLACING MAIN VORT TOO FAR NORTH. RESULT HAS BEEN BULK OF THUNDERSTORMS CLOSER TO MAIN CIRCULATION WELL OVER SOUTHERN HALF MO INTO SOUTHERN IL. THIS WILL LIFT NORTHEAST TO BRING ONSET OF CONVECTION INTO THE EASTERN CWA THIS EVENING...WHILE WIDESPREAD SHOWERS AND FEW THUNDERSTORMS ASSOCIATED WITH NRN MO VORT WILL CONTINUE UNTIL ABOUT SUNSET MAINLY EAST OF DBQ-CID-FFL AXIS. WILL THEN SEE A SEVERAL HOUR BREAK AND PARTIAL CLEARING LATE EVENING BEFORE NORTHERN PLAINS SHORTWAVE ARRIVES. BOTH GFS AND NAM HAD DECENT PLACEMENT OF H5 VORT CENTER OVER EASTERN WY AT 18Z. WILL FOLLOW BLEND...WITH FORCING ARRIVING INTO CWA BETWEEN 06Z AND 12Z AS MAIN VORT PASSES TO NORTH WITH CYCLOGENESIS TAKING PLACE ACROSS MN AND WI. THIS SHOULD RESULT IN AN ORGANIZED THUNDERSTORM COMPLEX PUSHING THROUGH LATE TONIGHT AND EARLY FRI. RAISED POPS TO CATEGORICAL OVER EAST CENTRAL IA...WHERE COMPLEX WILL ARRIVE AT MOST MATURE STAGE...KEEPING LIKELY ELSEWHERE. ALTHOUGH SPC HAS SLIGHT RISK FOR MUCH OF AREA WEST OF THE MS RIVER...THINKING HERE IS THAT THE LATE NIGHT/EARLY MORNING TIMING WITH LIMITED INSTABILITY WILL LIMIT SEVERE POTENTIAL TO SUB SEVERE WIND GUSTS ALONG ANY REMAINING BOWING SEGMENTS. BULK OF RAIN SHOULD BE OUT OF THE AREA BY MIDDAY FRI AS THE FRONT SHOULD EXIT TO EAST EARLY AFTERNOON. KEPT ONLY SLIGHT CHANCES EAST OF THE RIVER IN THE AFTERNOON. WARM START AND AFTERNOON SUNSHINE SHOULD ALLOW TEMPERATURES TO RECOVER TO MID 70S TO LOWER 80S...USING BLEND OF MOS GUIDANCE. ..SHEETS.. .LONG TERM... AUTUMN TO ARRIVE FOR FORESEEABLE FUTURE WITH COOLER TEMPERATURES AND MUCH LOWER HUMIDITIES. WENT WITH BLEND OF MOST CONSISTENT ECMWF WITH BLENDED INPUTS FROM GFS AND NAM-WRF WITH UKMET AN OUTLIER WHICH WAS DISREGARDED. FRIDAY NIGHT THROUGH SUNDAY NIGHT...MUCH LOWER HUMIDITIES AS WEAK CANADIAN HIGH PRESSURE TO SLIDE ACROSS REGION WITH NEAR NORMAL TEMPERATURES. MIN TEMPERATURES MAINLY IN 50S WITH SOME LOWER 60S POSSIBLE FAR SOUTH AND MAX TEMPERATURES IN 75 TO 85 RANGE WITH DEWPOINTS MAINLY IN 50S UNDER MOSTLY TO PARTLY SUNNY SKIES. SOME POTENTIAL FOR SHOWERS LATE SUNDAY ALONG MISSOURI BORDER AS FRONT TRIES TO PUSH BACK NORTH AND PASS FOR NEXT FORECAST/S/ TO CONSIDER. PREDICTED TEMPERATURES SHOULD BE WITHIN 2 TO 3 DEGREES WITH SOME POTENTIAL...ESPECIALLY NORTH OF I-80...FOR MIN TEMPS IN COLD DRAINAGE AREAS TO BE LOCALLY UP TO 5 DEGREES COOLER AND PASS THIS ALSO FOR NIGHT SHIFT TO LOOK FURTHER AT WITH FAIR SKIES...LOWER DEWPOINTS... LONGER NIGHTS AND LIGHT WINDS FOR BOUNDARY LAYER DECOUPLING AND SIGNIFICANT RADIATIONAL COOLING. MONDAY AND MONDAY NIGHT...UPPED POPS TO 30 TO 50 WITH SEASONABLY STRONG UPPER TROUGH TO PASS. TIMING MAIN REASON FOR NOT GOING HIGHER ATTM. ALL SOLUTIONS WITH DRIER AND COLDER AIR FILTERING IN FOR STRONG EVAPORATIVE COOLING AND WITH PHASING ISSUES OF ENERGY...RAIN AMOUNTS STILL A BIT IN QUESTION. CURRENT THINKING IS MUCH COOLER AND DRIER AIR WITH NEXT PULSE TO WRING OUT SEASONABLY MODERATE QUARTER TO THREE QUARTER INCH AMOUNTS IN THE FORM OF MAINLY STRATIFORM RAIN WITH SOME EMBEDDED THUNDER POSSIBLE SOUTH OF I-80 THAT COULD PRODUCE HEAVIER AMOUNTS. TIMING AND PHASING ISSUES BASED ON STRENGTH OF SIZE OF WAVES TO BE MOSTLY RESOLVED PROBABLY NEXT 24 HOURS. TEMPERATURES ON MONDAY INTO MONDAY NIGHT A CHALLENGE WITH NW SECTIONS MAX TEMPERATURES QUITE POSSIBLY WITH LOTS OF CLOUDS AND RAIN TO STAY IN 60S AND PASS FOR LATER SHIFTS TO CONSIDER. NW FLOW TO CUT OFF PRECIPITATION BY LATE MONDAY NIGHT AS EVEN STRONGER AND COLDER CANADIAN HIGH PRESSURE TO MOVE IN. TUESDAY INTO THURSDAY...TRIMMED TEMPERATURES MOST PERIODS AND AREAS WITH CONCERN BASED ON LOWER LEVEL THERMAL FIELD TEMPERATURES... ESPECIALLY MIN TEMPS...COULD STILL BE 5 DEGREES OR MORE TOO MILD. SOME POTENTIAL BASED ON BL TEMPS AND LIGHT WINDS TO SEE ISOLATED UPPER 30 DEGREE READINGS SO EARLY FALL DEFINITELY HERE. MAX TEMPS UPPER 60S TO LOWER 70S FOR IDEAL OUTDOOR ACTIVITIES. ..NICHOLS.. && .AVIATION... AN UPPER LEVEL DISTURBANCE...COMBINED WITH ABUNDANT MOISTURE...WILL CONTINUE WIDESPREAD SHOWERS AND FEW THUNDERSTORMS ACROSS EASTERN IA TERMINALS INTO EARLY EVENING. BULK OF ACTIVITY SHOULD DISSIPATE AROUND SUNSET. CIGS WILL REMAIN MAINLY VFR...WITH MVFR CONDITIONS IN THE SHOWERS. LATE TONIGHT...A STRONG UPPER LEVEL DISTURBANCE AND SURFACE COLD FRONT WILL PUSH THROUGH THE AREA PRODUCING WIDESPREAD THUNDERSTORMS ENTERING CID AND DBQ AFTER 07Z. MVFR CIGS AND VSBYS IN FOG WILL PRECEDE AND ACCOMPANY THIS ACTIVITY. WIDESPREAD IFR CONDITIONS WILL ACCOMPANY THE FRONT AND PRECIPITATION...FOLLOWED BY LIFTING CIGS AND IMPROVING VISIBILITIES AT TERMINALS MID TO LATE MORNING FRI. ..SHEETS.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SHEETS/NICHOLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 452 AM CDT THU SEP 6 2007 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-071000- 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- 452 AM CDT THU SEP 6 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 THUNDERSTORMS ARE EXPECTED TODAY ACROSS THE AREA AS A WEAK UPPER LEVEL PIECE OF ENERGY LIFTS ACROSS THE MISSISSIPPI RIVER VALLEY...AND AGAIN TONIGHT AS A STRONGER LOW PRESSURE SYSTEM APPROACHES THE REGION FROM THE WEST. THE RISK OF SEVERE WEATHER IS LOW...BUT AN ISOLATED DAMAGING WIND GUST CANNOT BE RULED OUT LATER TONIGHT. THE ROCK RIVER AT JOSLIN IS EXPECTED TO FALL BELOW FLOOD STAGE LATER TODAY. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ON FRIDAY AS A COLD FRONT PUSHES THROUGH THE AREA...MAINLY BEFORE MIDDAY. THESE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. MAYES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 147 AM CDT FRI SEP 7 2007 IAZ040>042-051>053-063>065-070815- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-IOWA-JOHNSON-CEDAR- INCLUDING THE CITIES OF...INDEPENDENCE...MANCHESTER...DUBUQUE... VINTON...CEDAR RAPIDS...ANAMOSA...MARENGO...IOWA CITY...TIPTON 146 AM CDT FRI SEP 7 2007 ...THUNDERSTORMS MOVING INTO EASTERN IOWA MAY PRODUCE STRONG GUSTY WINDS... A BROKEN LINE OF THUNDERSTORMS WILL MOVE QUICKLY NORTHEAST ACROSS THE AREA AT 40 TO 50 MPH THROUGH 3 AM. THIS LINE GENERALLY SHOULD REACH THE VINTON TO WILLIAMSBURG AREAS BY 210 AM...AND FROM MANCHESTER TO NORTHEAST OF IOWA CITY BY AROUND 250 AM. THE STRONGEST STORMS MAY PRODUCE GUSTY WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL AT RATES OF OVER AN INCH AN HOUR AS THEY PASS THROUGH. THIS HEAVY RAIN WILL PRODUCE SOME PONDING OF WATER ON ROADS AND INTO DRAINAGE DITCHES. 12
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 200 AM CDT FRI SEP 7 2007 IAZ076>078-087>089-098-099-MOZ009-010-070900- KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES-VAN BUREN- LEE-SCOTLAND-CLARK- INCLUDING THE CITIES OF...SIGOURNEY...WASHINGTON...WAPELLO... FAIRFIELD...MOUNT PLEASANT...BURLINGTON...KEOSAUQUA.... FORT MADISON...MEMPHIS...KAHOKA 200 AM CDT FRI SEP 7 2007 ...THUNDERSTORMS MOVING INTO SOUTHEASTERN IOWA MAY PRODUCE STRONG GUSTY WINDS... A BROKEN LINE OF THUNDERSTORMS WILL MOVE QUICKLY NORTHEAST ACROSS THE AREA AT 40 TO 50 MPH THROUGH 330 AM. THIS LINE GENERALLY SHOULD REACH THE WASHINGTON TO SOUTHWEST MOUNT PLEASANT AREAS BY AROUND 230 AM...AND THE WAPELLO AND MEDIAPOLIS AREAS BY AROUND 310 AM. THE STRONGEST STORMS MAY PRODUCE GUSTY WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL AT RATES OF OVER AN INCH AN HOUR AS THEY PASS THROUGH. THIS HEAVY RAIN WILL PRODUCE SOME PONDING OF WATER ON ROADS AND INTO DRAINAGE DITCHES. 12
The Quad Cities radar (KDVN), 90 km away, was scanning. The volume nearest the first event began at 08:08 UTC.
1 thunderstorm wind. Local standard time, as filed.
Winds estimated to be 65 mph blew down a tree and destroyed a small out building on the south side of Winfield, 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: 60871.