1 flash flood, as filed by the National Weather Service.
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 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 May 12, 7:55 PM CST, 3 hours 35 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 855 PM CDT THU MAY 12 2005 .DISCUSSION... GOING FCST IS PRETTY GOOD...HAVE MODIFIED SOME GRIDS AND UPLOADED THEM. UPDATED THE ZFP TEXT EARLIER TO ACCOUNT FOR SHRA/TS OVER THE ERN CWFA...AND WL LIKELY UPDATE IT AGAIN BETWEEN 9 AND 10 PM. NEW NAM SHOWS A PRETTY DECENT H7 SHORTWV MOVG THRU THE ERN CWFA THIS EVENING...NO SUPRISE SINCE SOMETHING FIRED OFF THE CONVECTION IN OUR E EARLIER TONIGHT. IN ADDN...ANOTHER AREA OF RAIN AND ISOLD TS HAS DEVELOPED IN NWRN NEB AND IS CURRENTLY MOVG NEWD. THAT IS LIKELY THE LAST HOORAH OF THIS UPPER TROF AS IT PULLS EWD. THEREFORE ADDED SOME CHC POPS AFT MIDNIGHT TO THE SW CWFA AND SLGT CHC AROUND THE HURON AREA WITH ITS NEWD MOVEMENT. BACK TO OUR ERN CWFA...MORE CONVECTION HAS REFIRED IN NW IA WITH THE AFOREMENTIONED SHORTWV MOVG THRU THIS AREA. CONVECTION COULD CONT IN NW IA FOR ANOTHER 2 TO 3 HRS BEFORE DISSIPATING. ALL OF THIS IS AIDED BY STRONG LOW LVL FRONTOGENSIS... BASICALLY ALONG AND EAST OF A MARSHALL MN TO YANKTON LINE...REALLY FOR A GOOD CHUNK OF TONIGHT. SOME SUBTLE THTE RIDGING ALSO EXISTS IN THE EAST. DECIDED TO TAKE OUT THE -DZ IN OUR FAR WRN CWFA AS NOTHING IN THE WAY OF WAA OR LIFT EXISTS IN THAT AREA ATTM...BUT AGAIN THEY COULD GET SHRA LATER TONIGHT. A CALL OUT TO THE HON FSS CONFIRMED THAT NO DZ IS FALLING ATTM...AND ALL VSBYS ARE 10SM IN OUR WEST. IN ADDN WITH SFC WINDS TURNING TO THE NORTH IN THAT AREA...NOT REAL CONDUCIVE FOR DZ. MODIFIED SOME SKY/PCPN/POP GRIDS FOR FRIDAY. MODELS CONT TO SHOW THE REMNANTS OF THE MID AND UPPER TROF MOVG THRU THIS AREA AND THERE IS ENUF FORCING TO WARRANT SOME 20 OR 30 POPS AHEAD OF IT...COUPLED WITH SOME DEEPENING MSTR ABV THE STRATUS. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && MJF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1054 AM CDT THU MAY 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- 1054 AM CDT THU MAY 12 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && 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), 139 km away, was scanning. The volume nearest the first event began at 05:30 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused a mudslide on Jackson County Road 23, with water and mud up to three feet deep.
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, May 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: 5453422.