The thermal cap diurnally weakened along a weak surface trough from north central Nebraska into central South Dakota by very late afternoon, which allowed an isolated strong to severe thunderstorm to develop. The storm tracked slowly eastward through the early evening.
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.
The thermal cap diurnally weakened along a weak surface trough from north central Nebraska into central South Dakota by very late afternoon, which allowed an isolated strong to severe thunderstorm to develop. The storm tracked slowly eastward through the early evening. Very large hail occurred early in the life cycle, with a transition toward damaging wind and torrential rainfall as it shifted east of the Missouri River.
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 25, 5:19 PM CST, 11 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Sioux Falls SD 847 AM CDT Sun Aug 25 2024 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-055-056-061-062-066-067-069>071-261400- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Brookings-Lake-Moody-McCook-Minnehaha- Turner-Yankton-Union- 847 AM CDT Sun Aug 25 2024 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, east central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Patchy fog will be possible into mid-morning Sunday. Visibility below one mile expected, with areas of visibility below one half mile. Dangerous heat is expected Sunday afternoon into early evening. Heat index values will range from 100 to 110 degrees at times. Overnight low temperatures into Monday morning may only fall into the lower to middle 70s. Patchy fog will again be possible Monday morning. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Hot and humid conditions continue into Monday. Heat index values may again climb between 100 and 110 degrees at times. Thunderstorm risks will grow by Monday afternoon and peak into Monday evening and early overnight. While there remains uncertainty on the coverage of storms, there is growing potential for an increased severe weather risk especially in areas along and north of Interstate 90. Risks include large hail up to or greater than 2 inches, straight line winds of 70 mph, and even the potential for a tornado or two. The peak time of severe weather risks will be between 4pm Monday and 2am Tuesday morning. Continue to monitor your local forecast. Scattered thunderstorms may continue Tuesday and return again by Wednesday and Thursday, through the risk for severe storms remains low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. SDZ038-039-050-052>054-057>060-063>065-068-261400- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Brule-Aurora-Davison- Hanson-Charles Mix-Douglas-Hutchinson-Bon Homme- 847 AM CDT Sun Aug 25 2024 This Hazardous Weather Outlook is for central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Patchy fog will continue into mid-morning Sunday. Visibility below one mile expected, with areas of visibility below one half mile. Dangerous heat is expected Sunday afternoon into early evening. Heat index values will range from 100 to 110 degrees at times. Overnight low temperatures into Monday morning may only fall into the lower to middle 70s. Patchy fog will again be possible Monday morning. Isolated thunderstorms may be possible Sunday evening across central South Dakota and areas west of the James River. The main risks will be large hail up to 2 inches and damaging winds up to 70 mph. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Temperatures will cool slightly Monday, though heat index readings may still approach the 100 degree mark. Thunderstorm risks will grow by Monday afternoon and peak into Monday evening and early overnight. While there remains uncertainty on the coverage of storms, there is growing potential for an increased severe weather risk. Risks include large hail up to or greater than 2 inches, straight line winds of 70 mph, and even the potential for a tornado or two. The peak time of severe weather risks will be between 4pm Monday and 2am Tuesday morning. Continue to monitor your local forecast. Scattered thunderstorms may continue Tuesday and return again by Wednesday and Thursday, through the risk for severe storms remains low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The North Platte radar (KLNX), 172 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
9 thunderstorm wind, 6 hail, 1 flash flood. Local standard time, as filed.
A couple of windows were broken in a camper and holes punched in siding due to wind-driven hail.
Considerable quarter to golf ball size hail fell, with a few stones up to baseball size.
Initially quarter size hail became smaller, but continued through 1802 CST.
Thunderstorm winds uprooted or snapped several trees.
Thunderstorm wind gusts as high as 83 mph were measured by personal weather station KSDHERRI4.
Several tree limbs up to 3 inches in diameter were broken off by thunderstorm wind gusts.
Thunderstorm wind gusts up to 69 mph were measured by a personal weather station.
Thunderstorm winds downed numerous 3 inch tree limbs south of Platte.
Mobile mesonet winds were measured up to 71 mph.
Numerous tree limbs were downed by thunderstorm winds around Platte.
Thunderstorm wind gusts up to 65 mph were measured by personal weather station KSDPLATT39.
Significant street flooding was observed in Platte with tree debris floating down the streets in town.
Several smaller tree limbs were downed near New Holland.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2024Every state in 2024This day in weather historyWarnings in South Dakota, August 2024
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 2026-10-01. Each event’s entry at NCEI: 1206166, 1206167, 1206168, 1206169, 1206172, 1206177, 1206170, 1206173, 1206178, 1206174, 1206179, 1206175, 1206171, 1206180, 1206164, 1206176.