A heavy rain event in early August pushed the James River near Huron back into Minor Flood Stage for much of the month. Impacts were limited to minor agriculture flooding.
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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.
A heavy rain event in early August pushed the James River near Huron back into Minor Flood Stage for much of the month. Impacts were limited to minor agriculture flooding.
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, 5:29 AM CST, 1 hour 31 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 629 AM CDT Sun Aug 6 2023 .SHORT TERM...(Today and Tonight) Issued at 306 AM CDT Sun Aug 6 2023 1. A fairly damp, dreary, and cool Sunday is on tap for the Tri- State area. 2. We shift towards a weather pattern that will bring slightly cooler temperatures and rain chances every 2 days through the upcoming week. 3. Generally though severe weather risks will remain on the lower side through the upcoming week. ----------------------------------------------------------------- THIS MORNING: Extensive cloud cover and continued shower activity remains in place over the Tri-state area this morning. Water vapor showing a distinct swirl in imagery over southern South Dakota, with an apparent dry slot extending into southwestern Minnesota. The surface low this morning is centered just south of Mitchell, with increasing gradient winds over 35 mph now moving into South Central South Dakota. We should continue to see scattered slow moving showers develop through the morning as the upper low pivots towards southeastern South Dakota. The favored area for new development will be along and north of I-90. Generally though, instability remains minimal, so have reduced PoT thunder to isolated coverage and rainfall rates remain up to a half inch per hour. TODAY: The aforementioned upper low will drift into Northwest Iowa later this morning. As strong dPVA moves into NW Iowa, we should see additional convection develop quickly by daybreak across portions of NW Iowa and southern Minnesota. A bit more instability, so rainfall rates may be a bit more enhanced. Overall have bumped up QPF slightly, with 0.5 to 1.5 inch totals possible in a few areas. Further northwest, broad deformation zone precip will pivot southeast this morning, but may become a bit more intermittent as dry air is ingested into the upper wave. Less instability in the NW quadrant of the upper trough, so will keep thunder more limited and this should keep rainfall rates down. One area to watch later this afternoon will be along a secondary vorticity axis expected to drop southeast out of northern South Dakota and west central Minnesota. Scattered convection may form along a weak surface convergence line, with a non-zero potential for a few funnels to develop through early evening. TONIGHT: Scattered showers will finally diminish later this evening, but considerable cloud cover may remain into the first half of the night. Should skies clear after midnight, and winds drop off, not impossible to see fog develop into Monday morning. .LONG TERM...(Monday through Saturday) Issued at 306 AM CDT Sun Aug 6 2023 MONDAY-TUESDAY: Cooler and dry weather is expected to start the new work week, as mid-lvl flow turns more to the northwest. Temperatures remain slightly below normal and winds will also remain fairly light and variable. There may be an outside risk of a few elevated showers/thunderstorms developing late Tuesday afternoon and evening as weak mid-lvl vorticity and broad warm advection moves through northern Nebraska. WEDNESDAY: Medium range models remain in fairly strong agreement in bringing a shortwave trough through the Northern Plains by the middle of the week. Increasing isentropic lift develops late Tuesday night and persists through Wednesday, though there is quite a bit of difference in where the shortwave will track. NAM/ECMWF show a slightly further south track of the shortwave through southern Nebraska, with the GFS further to the northeast. Ensembles only suggest a 40-50% probability of more than a half inch of QPF, so have tapered back populated QPF slightly given preference for a slightly further southwest track with weaker lift. THURSDAY: The break between systems may be short, as we see a deeper upper trough moving into the Northern Plains. Sharp but short lived ridging and southwest winds may push highs into the 80s ahead of a progressive cold front still anticipated to arrive Thursday night. Scattered convection may form along this boundary if sufficient moisture can arrive in time. FRIDAY-SATURDAY: An early look at next weekend support cold advection behind the passing upper trough and cooler temperatures. Quite a bit of variability in the extended portions of the forecast, so no changes made. && .AVIATION...(For the 12Z TAFS through 12Z Monday Morning) Issued at 621 AM CDT Sun Aug 6 2023 Rain will continue to sink south and east slowly today. IFR ceilings have been noted across portions of the James River valley into northwest Iowa. Some influx of dry low-lvl air is now being noted from the northeast as ceilings have risen north of Interstate 90 towards west central Minnesota. Generally will continue to hold MVFR or lower ceilings along and south of Interstate 90 through the day as rain pivots southeast. Winds will begin to gust over 25 knots at times through the middle of the day as a surface low moves into northwest Iowa. Eventually drier air will work into the upper system and begin to erode lower stratus from west to east through the afternoon. Some additional isolated shower activity is possible later today over eastern South Dakota, but coverage too low to include in a prevailing group at this time. Stratus holds on across northwest Iowa into the overnight hours, and as cloud thin towards daybreak Monday, fog could develop. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...Dux LONG TERM...Dux AVIATION...Dux
Hazardous Weather Outlook National Weather Service Sioux Falls SD 431 AM CDT Sun Aug 6 2023 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-070945- 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- 431 AM CDT Sun Aug 6 2023 This Hazardous Weather Outlook is for portions of 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 Scattered showers and isolated thunderstorms will continue through much of Sunday. Slow moving rain may lead to ponding of water and minor flooding, especially in urban areas, or in areas that received significant rain Saturday. Patchy fog may be possible Monday morning. .DAYS TWO THROUGH SEVEN...Monday through Saturday Additional risks for rain arrive by Wednesday, however the risk for severe storms is low. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, however rainfall reports or reports of flooding are encouraged.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The James River at Huron rose above flood stage on the morning of the 6th before cresting 0.41 ft above flood stage (11.41 ft) on the 19th. The river then fell below flood stage on the morning of the 27th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2023Every state in 2023This day in weather historyWarnings in South Dakota, August 2023
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: 1118810.