A thunderstorm produced damaging winds near the town of Dixon on the evening of August 6th.
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 FSD wrote it up.
A thunderstorm produced damaging winds near the town of Dixon on the evening of August 6th.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Aug 6, 7:47 PM CST, 1 hour 41 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 847 PM CDT SAT AUG 6 2011 .DISCUSSION... STABLE LAYER OVER MUCH OF SE SOUTH DAKOTA...SW MINNESOTA AND NORTHWEST IOWA...COMBINED WITH LITTLE CONVERGENCE...HAS COMBINED TO LIMIT CONVECTION ACROSS MOST OF THE AREA. ONLY SOUTH OF HIGHWAY 20 HAS CONVECTION BEEN DEVELOPING. HOWEVER...AS CONVECTION CONTINUES TO INTENSIFY ACROSS NEBRASKA...LITTLE ADDITIONAL CONVECTION IS EXPECTED TO DEVELOP AROUND SIOUX CITY. WILL NEED TO WATCH THE LEFT MOVING SUPERCELLS THAT IS IN PIERCE COUNTY NEBRASKA FOR THE NEXT HOUR AS IT COULD MOVE ACROSS SOUTHERN DIXON AND DAKOTA AND INTO WOODBURY COUNTY. THE STORM IS EXPECTED TO REMAIN BELOW SEVERE LIMITS AS IT MOVES INTO AN AIRMASS THAT HAS ALREADY BEEN WORKED OVER BY CONVECTION EARLIER THIS EVENING. EXPECT THAT A LOT OF THE CUMULUS ACROSS THE AREA WILL GRADUALLY DISSIPATE BY 04Z WITH LOSS OF DAYTIME HEATING LEAVING MOSTLY CLEAR SKIES IN ALL BUT NORTHWEST IOWA. DO BELIEVE THAT STRATUS OVER SOUTHEAST NORTH DAKOTA WILL MOVE INTO THE EAST CENTRAL SD AND SOUTHWEST MINNESOTA LATE TONIGHT BRINGING PARTLY TO MOSTLY CLOUDY SKIES. A FEW HIGHER LEVEL CLOUDS COULD ALSO MOVE INTO SOUTH CENTRAL SD. LOW TEMPS LOOK TO BE IN THE UPPER 50S TO MID 60S./SCHUMACHER && .AVIATION... COLD FRONT HAS MOVED INTO NW IA AS OF 01Z AND WILL CONTINUE TO PUSH SE THROUGH THE NIGHT. COULD STILL SEE A COUPLE ISOLATED THUNDERSTORMS IN THE VICINITY OF KSUX THROUGH 04Z...BUT THESE WILL BE BELOW SEVERE LIMITS AND DISSIPATING QUICKLY THROUGH THE LATE EVENING. SCATTERED SHOWERS NORTHEAST OF KHON SHOULD DIE OFF AFTER SUNSET AND NOT AFFECT THE AREA. WITH NORTHWEST WINDS BRINGING IN A LITTLE COOLER AIRMASS AND WIND SPEEDS DECREASING LATE TONIGHT...CAN NOT RULE OUT SOME MVFR FOG AND STRATUS AROUND SUNRISE SUNDAY FOR ALL OF THE TAF SITES. && .PREVIOUS DISCUSSION... FORECAST CHALLENGE FOR THIS AFTERNOON AND EVENING IS CHANCES OF THUNDERSTORMS. COMPUTER MODEL INDICATIONS ARE FOR DEVELOPMENT LATE THIS AFTERNOON MAINLY EAST OF THE JAMES VALLEY. LATEST RUN OF THE HRRR TRIES TO DEVELOP STORMS EAST OF MITCHELL...WITH CONVECTION DEVELOPING INTO A LINE AS IT MOVES ACROSS SE SD AND NW IA. NAM IS FARTHER NORTH WITH THE DEVELOPMENT OVER NE SD...AND GFS DEVELOPS THE MAIN AREA OF STORMS OVER NE SD BUT EXTENDS CONVECTION ALONG SOUTHWARD ALONG INTESTATE 29 INTO IA. HAVING A TOUGH TIME BELIEVING ANY OF THESE SOLUTIONS. WEAK FRONTAL BOUNDARY HAS ALREADY PUSHED ACROSS THE ENTIRE FORECAST AREA...AND UPPER LEVEL WAVE MOVING ACROSS NORTHERN MINNESOTA...SO NO REAL FORCING OR LIFT ACROSS THE AREA. ALSO SEEING A LOT OF FLAT STATUS AND CUMULUS INDICATIVE OF A FAIRLY STRONG STABLE LAYER OVER THE AREA. BEST CHANCES FOR THUNDERSTORMS SHOULD BE NEAR AN OUTFLOW/FRONT ACROSS CENTRAL MN...POSSIBLY INTO FAR NE SD THIS EVENING. KEPT SOME SMALL END CHANCES ACROSS THE CWA THIS EVENING...BUT OVERALL CHANCES ARE SMALL. OF COURSE SHOULD THUNDERSTORMS DEVELOP...THERE IS ENOUGH SHEAR AND INSTABILITY FOR SEVERE THUNDERSTORMS. MAIN SEVERE THREAT WOULD BE HAIL AND WIND. /97 SUNDAY SHOULD BE A PLEASANT DAY ACROSS THE CWA AS SURFACE HIGH PRESSURE SLIDES SOUTHEAST ACROSS THE CWA. THE DAY WILL GENERALLY START WITH CLEAR SKIES ACROSS THE WESTERN CWA WITH SOME STRATUS POSSIBLY STILL LINGERING OVER SOUTHWEST MINNESOTA BEFORE CLEARING OUT. THEN AM EXPECTING SOME MID AND HIGH CLOUDS TO SPREAD IN FROM THE WEST DURING THE AFTERNOON AHEAD OF NEXT SHORT WAVE WHICH SHOULD TRACK EAST ACROSS NEBRASKA SUNDAY NIGHT INTO EARLY MONDAY MORNING. FEEL BULK OF STORMS SHOULD STAY SOUTH OF CWA ALONG THE H85 BOUNDARY...BUT CAN NOT RULE OUT SOME ACCAS TYPE CONVECTION AFTER 06Z FURTHER NORTH TOWARDS I90. SO WILL KEEP A CHANCE ALONG THE MISSOURI RIVER SUNDAY NIGHT WITH A SLIGHT CHANCE FURTHER NORTH TOWARDS I90 AFTER 06Z. BULK OF RAIN FROM NEBRASKA WAVE SHOULD BE OUT OF CWA BY 12Z MONDAY...BUT MORE STORMS WILL PROBABLY DEVELOP WITH NEXT WAVE DROPPING SOUTHEAST ACROSS NORTH DAKOTA WHICH WILL PUSH FRONT THROUGH CWA DURING THE DAY AND EVENING. SO WILL KEEP CHANCE OF STORMS IN FORECAST ON MONDAY AND MONDAY EVENING. COULD BE A FEW SEVERE STORMS AHEAD OF THIS FRONT IN THE AFTERNOON AND EVENING HOURS WITH 3000 TO 4000 CAPES. BUT OF COURSE THAT WILL BE HIGHLY DEPENDENT ON WHETHER THERE WILL BE GOOD MIXING. WAVE MOVING ACROSS NEBRASKA SUNDAY NIGHT COULD GENERATE A LOT OF RAIN COOLED STRATUS ACROSS CWA ON MONDAY WHICH WOULD LIMIT BOTH THREAT OF STORMS...AND SEVERE STORMS. SO FOR NOW WILL NOT GO ANYMORE THAN 30 TO 40% POPS FOR MONDAY. ANY ACTIVITY THAT DOES DEVELOP MONDAY AFTERNOON OR EVENING SHOULD EXIT CWA BY 06Z TUESDAY AS COLD FRONT EXITS CWA. DRIER AND COOLER AIR WILL FOLLOW WITH PASSAGE OF FRONT...WITH PLEASANT WEATHER EXPECTED ACROSS THE CWA ON TUESDAY. WEST NORTHWEST FLOW ALOFT WILL PERSIST MOST OF NEXT WEEK WITH WEAK SHORT WAVES DROPPING SOUTHEAST ACROSS THE PLAINS. THE NEXT ONE IS PROGGED WEDNESDAY AND WEDNESDAY NIGHT WITH THE BEST CHANCE LIKELY TO BE SOUTH OF CWA CLOSER TO H85 FRONT. BETTER CHANCE FOR STORMS ON THURSDAY NIGHT AND FRIDAY AS NEXT WAVE TRACKS FURTHER NORTH ACROSS NORTHERN PLAINS WITH WITH QUASI WARM FRONT ACROSS SOUTH DAKOTA. SO WILL KEEP POPS SMALL FOR WEDNESDAY AND WEDNESDAY NIGHT WITH A BETTER CHANCE THURSDAY NIGHT AND FRIDAY. TEMPERATURES ON SUNDAY WILL BE 3 TO 5 DEGREE BELOW NORMAL FOR HIGHS...BACK TO NEAR NORMAL ON MONDAY...AND THEN COOLER THAN NORMAL FOR BOTH TUESDAY AND WEDNESDAY. ACTUALLY MOST OF NEXT WEEK SHOULD SEE SLIGHTLY COOLER THAN NORMAL TEMPERATURES WITH A BRIEF WARMUP ON FRIDAY AHEAD OF COLD FRONT. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1117 AM CDT SAT AUG 06 2011 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-071200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 1117 AM CDT SAT AUG 06 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THUNDERSTORM REDEVELOP WILL BE POSSIBLE ACROSS THE AREA THIS AFTERNOON...ALTHOUGH THE MAIN THREAT OF THUNDERSTORMS WILL BE ALONG AND EAST OF A LINE FROM HURON SOUTH DAKOTA TO STORM LAKE IOWA THIS EVENING. HAIL TO THE SIZE OF GOLF BALLS AND DAMAGING WINDS IN EXCESS OF 70 MPH ARE EXPECTED TO BE THE PRIMARY THREATS...HOWEVER ISOLATED TORNADOES WILL BE POSSIBLE. FLOODING... MODERATE TO MAJOR FLOODING IS EXPECTED TO CONTINUE ON THE JAMES RIVER UNTIL FURTHER NOTICE. HIGH RELEASES ALONG THE MISSOURI RIVER WILL CONTINUE INTO LATE SUMMER. HIGH WATER LEVELS WILL CAUSE SIGNIFICANT IMPACTS BETWEEN CHAMBERLAIN AND SIOUX CITY. THE HIGH FLOWS ON THE MISSOURI RIVER WILL ALSO CAUSE FLOODING ON THE BIG SIOUX RIVER NEAR SIOUX CITY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SCATTERED THUNDERSTORMS WILL BE POSSIBLE ON MONDAY AS ANOTHER WEAK COLD FRONT PUSHES THROUGH THE REGION. MOST STORMS SHOULD REMAIN BELOW SEVERE LIMITS. HOWEVER THE STRONGEST STORMS COULD PRODUCE LARGE HAIL TO THE SIZE OF QUARTERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 4 PM. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The Sioux Falls radar (KFSD), 132 km away, was scanning. The volume nearest the first event began at 03:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds caused tree damage, including a few branches blown down. The winds were accompanied by heavy rain and small hail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2011Every state in 2011This day in weather historyWarnings in Nebraska, August 2011
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: 339608.