5 miles northwest of Winthrop. 3 miles north of 200th Street.
Every event with a place to put it. 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.
Tornado developed in a corn field north of the intersection of Plymouth Avenue and 205th Street 2.5 miles northwest of Winthrop. Tornado moved on a east northeast track crossing 200th Street about 0.5 miles west of Reed Avenue and then crossing Reed Avenue about 0.3 miles north of 200th Street. Tornado continued east northeast crossing county route W45 (Slater Avenue) about 0.3 miles south of 190th Street. The tornado appears to have dissipated 0.3 miles east of Slater Avenue in a corn field just short of outbuildings on the Tegler Farm. Maximum width was 20 yards.
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 11, 2:18 PM CST, 5 hours 28 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 318 PM CDT THU AUG 11 2005 .SYNOPSIS...SURFACE WARM FRONT SLOWLY LIFTING BACK NORTH THIS AFTERNOON...SITUATED FROM NEAR KSUX THROUGH KEOK TO KSPI LINE AT 18Z. WIDESPREAD CLOUDINESS FROM OVERNIGHT AND MORNING CONVECTION HAS HELD DOWN TEMPERATURES AND KEPT A LID ON FURTHER DEVELOPMENT ON COOL SIDE OF BOUNDARY IN CWA. SIGNIFICANT BREAK IN CLOUD COVER BETWEEN WEAK MID LEVEL SHORTWAVES WAS SWEEPING THROUGH CENTRAL CWA AT 19Z. RESULTING INSOLATION WILL HAVE SIGNIFICANT CIN AND SEVERAL CAPS TO OVERCOME IN WORKED OVER ENVIRONMENT AS SEEN ON 18Z KDVN SOUNDING. THIS WARM FRONT TO REMAIN IN LOCAL AREA AND KEEP ACTIVE WEATHER GOING THROUGH WEEKEND. && .SHORT TERM...(TONIGHT)...FOCUS REMAINS ON THUNDERSTORM CHANCES AS WARM FRONT LIFTS THROUGH AREA. GFS AND NGM APPEARED TO HAVE BETTER INITIALIZATION AND SHORT TERM HANDLE OF THE SURFACE FRONT AND SYNOPTIC LOW POSITION. THESE MODELS...ALONG WITH THE UKMET SHOW THE FRONT ALONG I-80 BY 00Z TONIGHT WITH THE MAIN SYNOPTIC LOW OVER W OR NW MN...WHICH IS SUPPORTED BY CURRENT AREA OF 3 HOUR PRESSURE FALLS MAXIMA AT 19Z. ETA APPEARED TOO STRONG WITH SURFACE CIRCULATION AND TRIPLE POINT DEVELOPING OVER EAST CENTRAL IA BY 00Z AND DISMISSED. AREA OF CLOUDS WITH SCATTERED SHOWERS ASSOCIATED WITH MID LEVEL QG FORCING AND WEAK UPPER DIVERGENCE OVER CENTRAL AND NW IA WILL REACH AREAS NORTH OF INTERSTATE 80 EARLY THIS EVENING. SO FAR...THESE SHOWERS ONLY WEAK...BUT EXPECTING SOME INTENSIFICATION AS THEY REACH AIRMASS THAT HAS DESTABILIZED FROM THE PERIOD OF AFTERNOON SUNSHINE. ANOTHER FEATURE OF NOTE IS THE MCV SEEN ON VISIBLE IMAGERY MOVING INTO NW MO THAT MAY INTERACT WITH THE WARM FRONT OVER FAR SOUTH LATER THIS EVENING. LATEST 88D TRENDS SHOW SCATTERED THUNDERSTORMS DEVELOPING JUST SOUTH OF BOUNDARY IN NE MO PUSHING INTO SOUTHERN CWA...WHERE MSAS SURFACE BASED CAPES ABOVE 2500 J/KG AND WILL NEED TO BE MONITORED AS IT APPROACHES THE FRONT AND MORE FAVORABLE LOW LEVEL SHEAR LATE THIS AFTERNOON INTO EARLY EVENING. OVERALL...CONFIDENCE IS HIGH FOR WIDESPREAD SHOWERS AND THUNDERSTORMS NORTH OF THE FRONT AND RAISED POPS TO LIKELY NORTH OF I-80 WITH HIGH CHANCE POPS TO SOUTH THROUGH TONIGHT. WITH DEEP MOISTURE ON SOUNDINGS...HEAVY RAINFALL RATES POSSIBLE...BUT NOT A CONCERN UNLESS CELLS BEGIN TO TRAIN ALONG LOW LEVEL BOUNDARIES. ..SHEETS.. && .LONG TERM...(FRIDAY THROUGH NEXT THURSDAY)... NONLINEAR PROCESSES ARE THE DOMINATE DRIVER IN WHAT WILL OCCUR FRIDAY INTO SUNDAY. ALL MODELS HAVE DIVERGING SOLUTIONS ON THE DETAILS. HOWEVER...ALL AGREE THAT SEVERAL WAVES WILL MOVE ALONG THE FRONT AS IT MEANDERS BACK AND FORTH ACROSS THE AREA. FROPA DURING THE DIURNAL MINIMA FRIDAY MORNING IS NOT THE BEST TIME TO SEE WIDESPREAD SIGNIFICANT PRECIP. EXPECT PRECIP TO BE QUITE SPOTTY FOR MOST OF THE AREA. NEXT WAVE ARRIVING LATE FRIDAY NIGHT/SATURDAY SHOULD BRING A BETTER CHANCE OF PRECIP...AS WELL AS THE WAVE SATURDAY NIGHT/SUNDAY. SUNDAY NIGHT THROUGH THURSDAY...MODEL SOLUTIONS DIVERGE SIGNIFICANTLY ON SOLUTIONS REGARDING SENSIBLE WX. THIS IS LIKELY DUE TO THE NONLINEAR PROCESSES EARLY ON IN THE FORECAST CYCLE AFFECTING FUTURE POSITIONS OF THE MAIN FEATURES. AS A RESULT...HAVE ATTEMPTED TO GO MIDDLE OF THE ROAD AND HAVE INCLUDED SEVERAL PERIODS OF SILENT 20 POPS...ESPECIALLY THE TUESDAY NIGHT THROUGH THURSDAY TIME PERIOD. ...08... && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SHEETS/08
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 514 AM CDT THU AUG 11 2005 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-121015- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON- CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON- HENRY-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL- WHITESIDE-ROCK ISLAND-BUREAU-PUTNAM-MERCER-HENDERSON-WARREN- HANCOCK-MCDONOUGH-SCOTLAND-CLARK- 514 AM CDT THU AUG 11 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...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS THE AREA THIS MORNING. SOME OF THE EMBEDDED THUNDERSTORMS MAY BE STRONG... WITH GUSTY WINDS AND SMALL HAIL AS WELL AS BRIEF HEAVY RAINFALL... BUT STORMS ARE NOT EXPECTED TO REACH SEVERE LIMITS AT THIS TIME. LATER THIS AFTERNOON AND EVENING... A WARM FRONT TO THE SOUTH WILL PUSH NORTHWARD INTO CENTRAL IOWA TODAY. THUNDERSTORMS WILL DEVELOP LATER IN THE DAY AS THE AIR MASS BECOMES UNSTABLE NEAR AND SOUTH OF THE FRONT. WITH THAT INSTABILITY COMBINED WITH STRONG WINDS ALOFT... SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE... WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY THREATS. SOME OF THE THUNDERSTORMS MAY ALSO BRING BRIEF HEAVY DOWNPOURS. STORMS MAY DEVELOP INTO AN ORGANIZED SYSTEM THAT MOVES ACROSS THE AREA LATER TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SHOWERS AND THUNDERSTORMS ARE POSSIBLE ON FRIDAY AS THE FRONT RETREATS BACK TO THE SOUTH. WHILE THE MAIN THREAT FOR SEVERE WEATHER IS SOUTH OF THE AREA... THUNDERSTORMS ARE POSSIBLE IN THE AREA ON FRIDAY AFTERNOON AND EVENING... ESPECIALLY SOUTH OF INTERSTATE 80. SHOWERS AND THUNDERSTORMS MAY DEVELOP IN THE AREA ON SATURDAY AFTERNOON AND EVENING AS A COLD FRONT PUSHES ACROSS THE AREA FROM THE NORTHWEST TOWARD THE SOUTHEAST. AT THIS TIME... IT IS TOO EARLY TO DETERMINE THE THREAT FOR SEVERE WEATHER OR HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS LIKELY LATER TODAY AND TONIGHT. MAYES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 429 PM CDT THU AUG 11 2005 IAZ040>042-051>054-063>068-076>078-087>089-098>099- ILZ015-024>026-120300- BENTON IA-BUCHANAN IA-CEDAR IA-CLINTON IA-DELAWARE IA- DES MOINES IA-DUBUQUE IA-HENRY IA-IOWA IA-JACKSON IA- JEFFERSON IA-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA- LINN IA-LOUISA IA-MUSCATINE IA-SCOTT IA-VAN BUREN IA- WASHINGTON IA-HENDERSON IL-MERCER IL-ROCK ISLAND IL- WARREN IL- THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 714 IN EFFECT UNTIL 10 PM CDT FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 4 COUNTIES IN NORTHWEST ILLINOIS MERCER ROCK ISLAND IN WEST CENTRAL ILLINOIS HENDERSON WARREN IN IOWA THIS WATCH INCLUDES 21 COUNTIES IN EAST CENTRAL IOWA BENTON CEDAR CLINTON IOWA JACKSON JOHNSON JONES LINN MUSCATINE SCOTT IN NORTHEAST IOWA BUCHANAN DELAWARE DUBUQUE IN SOUTHEAST IOWA DES MOINES HENRY JEFFERSON KEOKUK LEE LOUISA VAN BUREN WASHINGTON THIS INCLUDES THE CITIES OF...ALEDO...ANAMOSA...BETTENDORF... BURLINGTON...CEDAR RAPIDS...CLINTON...DAVENPORT...DUBUQUE... FAIRFIELD...FORT MADISON...INDEPENDENCE...IOWA CITY...KEOSAUQUA... MANCHESTER...MAQUOKETA...MARENGO...MOLINE...MONMOUTH... MOUNT PLEASANT...MUSCATINE...OQUAWKA...ROCK ISLAND...SIGOURNEY... TIPTON...VINTON...WAPELLO AND WASHINGTON. ERVIN
The Quad Cities radar (KDVN), 139 km away, was scanning. The volume nearest the first event began at 01:47 UTC.
1 tornado. Local standard time, as filed.
Rated high F0 with winds estimated at 57 knots (65 mph). Based on areal video footage from KCRG TV Chopper 9.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2005Every state in 2005This day in weather historyThe tornado archive for Iowa, 2005Warnings in Iowa, August 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: 5471102.