1 lightning, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 Sep 12, 2:30 AM CST, 4 hours earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 330 AM CDT MON SEP 12 2005 .DISCUSSION... FAIRLY COMPLEX PATTERN OVER THIS FA THRU TUESDAY. ATTM...WELL DEFINED SFC CDFNT FM NE SD TO NR K9V9/KSFD. WAA CONVECTION RAPIDLY DEVELOPING AND MOVG NWD INTO MUCH OF THE WRN FA DUE TO S/W PROGRESSING NEWD FM ERN CO/WRN KS. THIS S/W WL MOVE NEWD ACROSS MAINLY THE WRN AND NRN PARTS OF THE FA TODAY. THE NAM/GFS ARE IN PRETTY GOOD AGREEMENT IN PUTTING THE HIGHEST AMNTS OF QPF OVR THE NRN PTNS OF THE FA TODAY...CLOSE TO THE FRONTAL BOUNDARY...BUT ALSO BECAUSE EXTREMELY STRONG LOW LVL JET SPEED CONVERGENCE EXISTS IN THAT AREA. THIS MRNG...THERE IS ACTUALLY A DECENT AMNT OF THIS SPEED CONVERGENCE NEARLY EVERYWHERE IN OUR FA...BUT IT LINGERS IN OUR N THRU THE AFTN HRS. THEREFORE LIKELY POPS ARE WARRANTED ACROSS OUR N TODAY...WITH PROGRESSIVELY SMALLER POPS MOVG SWD THRU THE FA. HIGHS TODAY ARE VERY TRICKY. AMPLE EVIDENCE SUGGESTS THAT THE CDFNT WL NOT HARDLY BUDGE...MAKING IT INTO OUR EXTREME WRN EDGE AND STALLING. HOWEVER CLOUD COVER FOR MUCH OF THE AREA...WHETHER THEY BE LOW...MID OR HIGHER CLOUDS WL BE ABUNDANT HOLDING TEMPS DOWN. IN FACT...THE NRN CWFA MAY NOT MOVE A WHOLE LOT WHERE THICKER CLOUDS ARE EXPECTED. WHATS INTERESTING IS THAT THIS FIRST WAVE EXITS THE NERN CWFA THIS EVENING...ALLOWING THE CDFNT TO FINALLY SLIP THRU THE FA TONIGHT. SINCE THE S/W INTERACTION AND -DIV Q WITH IT HAS LARGELY ENDED... FIGURE THE HIGHEST POPS WARRANTED WL BE ALONG THE FRONTAL BOUNDARY WHERE THE LOW LVL FRONTOGENESIS IS. IN ADDN...THE H85-H7 FRONT ALSO SAGS THRU GIVING SOME ADDITIONAL LOW TO MID LVL SUPPORT. THIS WL PLACE SCT POPS THRU OUR E AND S PARTS OF THE FA. HIGH DEGREES OF H9 RH IS SUGGESTED BY THE NAM FOR MUCH OF THE FA LATE MON NIGHT AND THRU MOST OF THE DAY ON TUE...SUGGESTING SOME CAA STRATO CU ADVECTING IN. IF THESE CLOUDS DO NOT CLEAR OUT SOMEWHAT TUE AFTN...MY FCST HIGHS WL BE TOO WARM. HOWEVER ADMITTEDLY I HAVE HIGHER CONFIDENCE IN THE HIGHS FM SIOUX CITY TO STORM LAKE...WHERE THE STRATO CU COULD BE ONLY SCT-BKN...AND ASSUMING THEY MIX TO FULL POTENTIAL FM H85. THE MSTR SOURCE GETS RAPIDLY CUT-OFF LATE TUE AND TUE NIGHT AS THE NRN PLAINS UPPER TROF DIGS INTO THIS AREA. WITH LIGHT WINDS TUE NIGHT...LOWS WL GET RATHER CHILLY WED MRNG. THERE IS ALSO A SHEARED OFF WAVE TUE NIGHT AND EARLY WED THRU THE CENTRAL PLAINS...WHICH SHOULD KEEP ANY WX MAKERS S OF THIS FA DURING THAT TIMEFRAME. AFTER THAT...WERE LOOKING AT AN INCREASINGLY ZONAL FLOW FOR A SHORT WHILE INTO THE MIDDLE OF THE WEEK. HOWEVER MODIFIED THE WINDS A BIT IN THE EXTENDED DUE TO A POTENTIAL FRONTAL PASSAGE IN THIS FA THU NIGHT. THE NAM/UKMET/GFS AND CANADIAN ALL POINT TO A DECENT UPPER TROF IN THE NRN RCKYS AT 72 HR VALID 00Z THU. WITH VARYING DEGS OF SPEED...THEY THEN MARCH THIS WAVE EWD. CHOSE TO FOLLOW THE SLOWEST SOLN ATTM WHICH WOULD BE THE GFS...ALTHOUGH THE CANADIAN WAS VERY CLOSE. THE NAM WAS THE QUICKEST. THIS PUTS A FROPA THRU THURSDAY NIGHT. AHEAD OF IT...PLENTY OF LOW TO MID LVL WAA AND THTE/ADV EXISTS WED NIGHT WARRANTING SOME MENTION OF TS. SOME OF THIS WL CERTAINLY LINGER IN OUR NE THU MORNING. HOWEVER...THE CANADIAN IS INTERESTING IN THAT IT PHASES A SRN STREAM WAVE WITH THE NRN STREAM PASSAGE IN THIS FA ON THU OR THU NIGHT...PUTTING A LOT OF RAINFALL ACROSS OUR S DURING THAT TIMEFRAME. ATTM...THAT SOLN SEEMED TO BE AN OUTLIER AND WAS NOT FOLLOWED...BUT WORTHY OF SOME SMALL POPS ELSEWHERE IN OUR E HALF OUTSIDE OF SW MN. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && MJF
HAZARDOUS WEATHER OUTLOOK...CORRECTED TYPOS IN DAY ONE NATIONAL WEATHER SERVICE SIOUX FALLS SD 425 AM CDT MON SEP 12 2005 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-131200- 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- 425 AM CDT MON SEP 12 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS TODAY THROUGHOUT SOUTHEAST SOUTH DAKOTA...FAR NORTHEAST NEBRASKA...NORTHWEST IOWA AND SOUTHWEST MINNESOTA. IN ADDITION...THIS SLIGHT RISK OF SEVERE WEATHER WILL LIKELY CONTINUE INTO THE EVENING HOURS ALONG AND EAST OF A YANKTON SOUTH DAKOTA...TO BROOKINGS SOUTH DAKOTA LINE. THIS WOULD INCLUDE ALL OF SOUTHWEST MINNESOTA AND NORTHWEST IOWA. WITH THE AMOUNT OF INSTABILITY AND WIND SHEAR AVAILABLE IN THE LOW TO MID LEVELS OF THE ATMOSPHERE...THE PRIMARY THREAT WILL BE HAIL UP TO THE SIZE OF QUARTERS OR SLIGHTLY LARGER. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION COULD BE POSSIBLE THROUGH TODAY. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The Sioux Falls radar (KFSD), 116 km away, was scanning. The volume nearest the first event began at 12:32 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a transformer at the back of a food store, causing a local power outage which lasted for 10 hours. Volunteers moved perishable refrigerated and frozen food into ice trucks and a freezer trailer, avoiding spoilage of over $100,000 worth of food.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2005Every state in 2005This day in weather historyWarnings in Minnesota, September 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: 5474560.