A thunderstorm produced damaging winds in southern Dixon County on the evening of August 1st.
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 in southern Dixon County on the evening of August 1st.
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 1, 8:43 PM CST, 1 hour 17 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 943 PM CDT WED AUG 1 2012 .DISCUSSION... THUNDERSTORMS HAVE BEEN GRADUALLY WEAKENING AS THEY MOVE EAST ACROSS THE AREA...AND HAVE CANCELLED ALL SEVERE THUNDERSTORM WATCHES ACROSS THE CWA. STILL WATCHING ONE STRONGER LINE IN NORTHEAST NEBRASKA... HOWEVER IT IS MOVING INTO SLIGHTLY MORE STABLE AIRMASS...SO THINKING THIS WILL ALSO WEAKEN AS IT PROGRESSES EAST OVER THE NEXT FEW HOURS. STILL CARRYING CHANCE/SCATTERED POPS INTO NORTHWEST IOWA OVERNIGHT BUT EXPECT RAINFALL AMOUNTS TO BE MORE ON THE ORDER OF A TENTH INCH OR LESS...RATHER THAN THE QUARTER INCH PLUS THAT WAS SEEN EARLIER THIS EVENING ACROSS THE WESTERN AND NORTHERN PARTS OF THE CWA. TEMPS HAVE BEEN TRICKY THIS EVENING...DROPPING QUICKLY AS THE COLD OUTFLOW MOVED THROUGH. SEEM TO BE STABILIZING A BIT MORE OVER THE PAST HOUR OR TWO THOUGH...AND DO NOT ANTICIPATE ANY SIGNIFICANT CHANGES TO OVERNIGHT LOWS. NUMEROUS UPDATES HAVE ALREADY BEEN SENT AS PORTIONS OF THE SEVERE THUNDERSTORM WATCHES HAVE BEEN CANCELLED. WILL SEND AT LEAST ONE MORE SHORTLY TO CLEAR WATCH HEADLINE FROM ALL AREAS. && .AVIATION.../FOR THE 00Z TAF ISSUANCE/ CONDITIONS ARE EXPECTED TO BE REMAIN VFR FOR THE BULK OF THE PERIOD THROUGH 00Z FRIDAY. HOWEVER...SCATTERED HIGH BASED THUNDERSTORMS WILL CONTINUE FOR A FEW HOURS NORTH OF SOUTHWARD ADVANCING OUTFLOW BOUNDARY...WHICH WILL PUSH THROUGH KFSD AREA WITH GUSTS TO 30 TO 35 KNOTS AROUND 0045Z. A FEW SEVERE STORMS WITH WIND GUSTS OF 50 TO 60 KNOTS WILL BE POSSIBLE MAINLY WEST AND NORTH OF THE SIOUX FALLS AREA THROUGH MID EVENING...BUT ERRATIC WINDS ARE LIKELY WITH ALL STORMS OVERNIGHT. STRONGER STORMS WILL LIKELY POSSESS SHORT TERM MVFR CONDITIONS ALONG WITH STRONGER RAIN PRODUCING CELLS...BUT CONDITIONAL PROBABILITY SHOULD LIMIT NEED TO MENTION IN TAFS AT THIS POINT. /CHAPMAN && .PREV DISCUSSION.../ISSUED AT 345 PM CDT/ FORECAST WILL FOCUS ON TWO AREAS FOR CONVECTIVE DEVELOPMENT TONIGHT. FIRST WILL BE TO THE NORTH OF HIGHWAY ALONG STATIONARY BOUNDARY. AS CONVECTION BECOMES MORE WIDESPREAD...BOUNDARY WILL BEGIN TO MOVE SOUTH AND EAST. SECOND AREA OF CONCERN WILL BE FURTHER TO THE WEST ACROSS WESTERN AND CENTRAL SOUTH DAKOTA. STORMS BEGINNING TO DEVELOP IN THE WEST...AND WILL MOVE SOUTH AND EAST DOWN THE THETA-E RIDGE. MAIN SEVERE THREAT WITH STORMS WILL BE STRONG WINDS WITH INVERTED V SOUNDING IN THE SUB CLOUD LAYER. EASTERLY FLOW WILL SET UP ACROSS THE AREA TOMORROW NORTH OF THE FRONT. WITH 850 HPA TEMPERATURES...HIGHS WILL STILL CLIMB TO ABOVE NORMAL LEVELS IN THE UPPER 80S AND LOWER 90S. THURSDAY NIGHT WILL GENERALLY BE QUIET ACROSS THE CWA AS SURFACE HIGH SLIDES EAST ACROSS MN. WILL SEE MOSTLY CLEAR SKIES AND MILD TEMPERATURES WITH LOWS IN THE 60S AS THE LOW LEVEL FLOW BECOME LIGHT SOUTHEAST AHEAD OF MAIN SYSTEM ON FRIDAY. MAY SEE A FEW STORMS AFTER 06Z WEST OF THE JAMES VALLEY WITH WEAK WAVE. STORMS WOULD BE FAIRLY ELEVATED AND SPOTTY ALONG AXIS OF LOW LEVEL JET FROM CENTRAL NEB INTO CENTRAL SD. ANY ACTIVITY LEFT FRIDAY MORNING SHOULD SLIDE OFF TO THE NORTHEAST AND POSSIBLY CLIP FAR NORTH IN THE MORNING. ON FRIDAY...THE MODELS ARE A LITTLE SLOWER WITH UPPER WAVE AND ASSOCIATED COLD FRONT. SO MOST THUNDERSTORM ACTIVITY MAY HOLD OFF DEVELOPING ACROSS FAR WESTERN CWA UNTIL LATE AFTERNOON AND THEN SPREAD EAST OVERNIGHT. WITH UPPER WAVE MOVING ALONG THE CANADIAN BORDER FEEL BEST CHANCE OF STORMS WILL BE NORTH OF I90 FRIDAY NIGHT AND COULD BE FURTHER NORTH. SO FOR NOW WILL KEEP LIKELY GOING ACROSS EAST CENTRAL SD INTO SOUTHWEST MN AND CHANCE FURTHER SOUTH. DECENT THREAT OF SEVERE WEATHER WITH THIS WAVE ACROSS THE NORTH CLOSER TO RETREATING WARM FRONT. COOLER AIR WILL SPREAD INTO THE CWA FOR THE WEEKEND WITH HIGHS IN THE UPPER 70S TO MID 80S. A FEW STORMS COULD LINGER ACROSS THE FAR SOUTH SATURDAY MORNING...WITH ISOLATED STORMS POSSIBLE DURING THE AFTERNOON ACROSS SOUTHWEST MINNESOTA AS WEAK SECONDARY WAVE DROP SOUTHEAST ACROSS MINNESOTA. HOT TEMPERATURES WILL RETURN EARLY NEXT WEEK AS RIDGE ALOFT BUILDS ACROSS PLAINS WITH ANOTHER CHANCE OF STORMS MID WEEK AS WAVE FLATTENS RIDGE. && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1114 AM CDT WED AUG 01 2012 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-021200- 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- 1114 AM CDT WED AUG 01 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON ALONG HIGHWAY 14 CORRIDOR AND ACROSS CENTRAL SOUTH DAKOTA AND PUSH EAST TOWARDS THE JAMES RIVER AFTER 4 PM. A FEW OF THESE STORMS COULD BE SEVERE...WITH STRONG DAMAGING WINDS AROUND 60 MPH THE MAIN THREAT. THESE STORMS ARE EXPECTED TO WEAKEN AS THEY APPROACH THE INTERSTATE 29 CORRIDOR LATER THIS EVENING. IF A STORM IS ABLE TO FORM IT WOULD ALSO HAVE THE POTENTIAL TO PRODUCE SEVERE WIND GUSTS. AFTER MIDNIGHT...THE SEVERE THREAT SHOULD BE MINIMAL...HOWEVER SCATTERED THUNDERSTORMS WILL STILL BE POSSIBLE. EXCESSIVE TEMPERATURES... HEAT INDICES ARE EXPECTED TO REACH 100 TO 105 DEGREES THIS AFTERNOON ALONG AN ARC FROM WESSINGTON SPRINGS...TO SIOUX FALLS TO SIOUX CITY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS ARE POSSIBLE FRIDAY AFTERNOON AND EVENING AHEAD OF AN EASTWARD MOVING COLD FRONT. IF STORMS ARE ABLE TO FORM...THEY COULD BE SEVERE WITH STRONG WINDS AND LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 4 PM TODAY. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
622 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0617 PM TSTM WND DMG 1 S MARSHALL 44.43N 95.78W
08/01/2012 LYON MN PUBLIC
SIDING TORN OFF SIDES OF TRAILER HOMES
&&
JSHEEHANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
627 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0621 PM TSTM WND GST 1 W MARSHALL 44.45N 95.81W
08/01/2012 E60 MPH LYON MN TRAINED SPOTTER
ALSO RECEIVING UP TO 1/2 INCH HAIL
&&
JSHEEHANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
745 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0720 PM HAIL 4 N CURRIE 44.13N 95.67W
08/01/2012 M1.25 INCH MURRAY MN TRAINED SPOTTER
&&
JCHAPMANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
808 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0730 PM TSTM WND GST 6 NNE GEDDES 43.34N 98.66W
08/01/2012 E60 MPH CHARLES MIX SD PUBLIC
A FEW SMALL BRANCHES DOWN
&&
JSHEEHANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
930 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0625 PM TSTM WND GST 5 SSW MARSHALL 44.39N 95.81W
08/01/2012 E60 MPH LYON MN TRAINED SPOTTER
A COUPLE OF TREES HAD DAMAGE AND CORN LAYING OVER
&&
JSHEEHANPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1040 PM CDT WED AUG 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0529 PM HAIL 3 NE TAUNTON 44.62N 96.02W
08/01/2012 E1.75 INCH LYON MN PUBLIC
0535 PM HAIL MINNEOTA 44.56N 95.98W
08/01/2012 E1.75 INCH LYON MN EMERGENCY MNGR
0547 PM TSTM WND GST 2 W MARSHALL 44.45N 95.82W
08/01/2012 M62.00 MPH LYON MN AWOS
0617 PM TSTM WND DMG 1 S MARSHALL 44.43N 95.78W
08/01/2012 LYON MN PUBLIC
SIDING TORN OFF SIDES OF TRAILER HOMES
0621 PM TSTM WND GST 1 W MARSHALL 44.45N 95.81W
08/01/2012 E60.00 MPH LYON MN TRAINED SPOTTER
ALSO RECEIVING UP TO 1/2 INCH HAIL
0625 PM TSTM WND GST 5 SSW MARSHALL 44.39N 95.81W
08/01/2012 E60.00 MPH LYON MN TRAINED SPOTTER
A COUPLE OF TREES HAD DAMAGE AND CORN LAYING OVER
0720 PM HAIL 4 N CURRIE 44.13N 95.67W
08/01/2012 M1.25 INCH MURRAY MN TRAINED SPOTTER
0730 PM TSTM WND GST 6 NNE GEDDES 43.34N 98.66W
08/01/2012 E60.00 MPH CHARLES MIX SD PUBLIC
A FEW SMALL BRANCHES DOWN
&&
JCHAPMANThe Omaha radar (KOAX), 116 km away, was scanning. The volume nearest the first event began at 04:00 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds caused tree damage, including up to 6 inch diameter limbs broken.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2012Every state in 2012This day in weather historyWarnings in Nebraska, August 2012
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: 409915.