70 inches 5 miles east of Hitchcock.
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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.
Overnight and early morning heavy rainfall from 5 to 9 inches occurred across northern Beadle County, with reported amounts as high as 8.36 inches 13 miles northwest of Broadland, 6.12 inches at Hitchcock, and 5.70 inches 5 miles east of Hitchcock.
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 3, 2:48 AM CST, 2 hours 37 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Sioux Falls SD 348 AM CDT Sun Aug 3 2025 .KEY MESSAGES... - Showers and storms move east this morning, with additional shower and storm chances this afternoon through tonight. Main threat with storms is heavy rainfall. Severe weather risk is low. - Surface and vertical smoke layers gradually move eastward through tonight. Air quality should begin to improve this afternoon in most areas. - More conditional risks of strong to severe storms develop Monday afternoon and evening. Locally heavy rainfall and strong winds are the primary risks, with large hail a secondary risk. - Temperatures begin to warm above normal through most of next week, with persistent unsettled weather. Strong to severe storm risks continue mid to late week. && .DISCUSSION... Issued at 346 AM CDT Sun Aug 3 2025 NOW THROUGH TONIGHT: Main concern through the morning hours is the heavy rain potential as showers and storms slowly move off to the east through mid morning. Storms this morning have already produced rainfall rates to 2-3 inches per hour, with rainfall totals in northern portions of Beadle county between 3 and 6.5 inches through 2 AM. Most of the area is experiencing 1 hour rainfall rates under 1 inch/hour, with pockets of 2 inches/hour at the time of this discussion. With PWATs at or above 1.5", expect the heavy rainfall threat to continue through the morning hours. Showers and storms continue to move east this morning, possibly lingering in southwestern MN into the early afternoon as the vorticity lobe moves east. With the mid level low spinning off to our north, shower and storm chances return by late afternoon into this evening, mainly west of the James River and north of US Hwy 14 as the next vort lobe pivots into our western counties. Guidance continues to vary on the timing/strength of this lobe. Surface boundary from a weak surface low pressure in northern NE stretching into northeastern SD may help fire storms through the evening, with the vorticity and WAA. Severe weather risk looks low at this time, with shear from most guidance less than 30 knots and instability around 1500 J/kg. Mid level lapse rates are around 7 deg C/km. A strong to severe storm is possible in south central SD, where shear, instability, and lapse rates are greater. Can't rule out a stronger storm moving into our far western counties this evening, but storms should weaken as they move toward the James River Valley as instability drops off. Again, locally heavy rainfall is possible today and tonight with PWATs 1.5-2 inches over the area (in the top 10% of climatology) and a southwesterly LLJ around 25-30 kts. Rates could approach or exceed 1" per hour. Outside of precipitation, southerly surface flow should help to push the thicker concentration of smoke at lower levels back to the northeast, and a slightly more westerly flow aloft should reduce concentration through the higher levels - moving it east. However, with guidance poorly handling smoke the last few days and the overall flow pattern, expect some lingering lesser concentrations through tonight. Air quality and visibility should improve as concentrations lessen. Temperatures today remain near to cooler than normal with highs in the mid 80s to mid 80s. Lows tonight in the upper 50s to lower 60s. MONDAY-MONDAY NIGHT: Any late Sunday convection moves to the east Monday morning. Unsettled pattern continues with additional mid and upper level waves moving out of the Rockies. Southeasterly surface flow allows for continued efficient moisture transport with dew points climbing into the upper 60s to lower 70s and temperatures in the upper 70s to mid 80s for most of the area. Some uncertainty exists in the timing of the wave and how capped we may be, but instability will be higher as will shear. Lapse rates are not as steep Monday (around 6.5 deg C/km or less) but can't rule out an isolated strong to severe storm in the afternoon and evening. Damaging wind gusts would be the main threat with any storms, although some larger hail is possible in south central SD with slightly higher lapse rates. Locally heavy rainfall is also possible through Monday night. TUESDAY-SATURDAY: Mid and upper level low pressure treks east across the International Border Tuesday and Tuesday night, flattening the ridge. This continues across the southwestern US and southern Plains mid to late week, with a more westerly flow due to troughing sweeping along the International Border and southern Canada through Thursday. Guidance varies on how/when/where this main trough tracks through the northern Plains Thursday night onward. Tuesday looks to be a breezy day with tight SPG with gusts to 35 mph west of the James River with warmer temps. Temperatures and humidity continue to increase mid to late week, with highs in the upper 80s to mid 90s by Thursday. May see some areas approach or exceed heat index values of 100 deg F by Thursday and Friday (30% chance or less through the lower MO River Valley). Aforementioned pattern keeps periodic shower and storm chances in place through the end of the week. Machine learning from multiple sources shows at least some (5%) risk of strong to severe storms over portions of the northern Plains through much of next week. Keep an eye on the forecast if you have outdoor or travel plans as details become more clear. && .AVIATION /06Z TAFS THROUGH 06Z MONDAY/... Issued at 1030 PM CDT Sat Aug 2 2025 Showers and isolated thunderstorms continue over the northern James River Valley late this evening. The overall trend should be for showers/isolated thunderstorms to expand southward and spread eastward into Sunday morning. Latest ensembles are also indicating a 40-70% probability of MVFR stratus sinking southward across the area on Sunday morning behind the exiting showers. In addition to this, areas of smoke will persist tonight into at least early Sunday. Additional showers and thunderstorms may develop later on Sunday afternoon and evening, primarily west of Interstate 29, though confidence is low at this time. Winds will remain out of the southeast through the TAF period, occasionally gusting around 20 kts, before diminishing on Sunday evening. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && DISCUSSION...SG AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 409 AM CDT Sun Aug 3 2025 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-040915- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory- Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook- Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton- Union- 409 AM CDT Sun Aug 3 2025 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Showers and thunderstorms continue moving east through late this morning. Locally heavy rainfall has been occurring with these storms, so be prepared for isolated ponding or flooding. Severe weather is not expected. Additional storms are expected this afternoon through tonight. Severe weather risk is low, but heavy rainfall is possible. Areas of surface smoke will linger into Sunday, resulting in unhealthy air quality at times, especially for sensitive groups. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The chance for periodic showers and thunderstorms linger through the middle of next week. A few strong to severe storms may develop Monday afternoon and evening. Uncertainty remains in coverage and potential severity from Tuesday onward. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Aberdeen radar (KABR), 96 km away, was scanning. The volume nearest the first event began at 11:25 UTC.
1 flash flood. Local standard time, as filed.
A couple feet of water inundated County Road 6 (193rd Street) east of 394th Avenue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2025Every state in 2025This day in weather historyWarnings in South Dakota, August 2025
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: 1290343.