A weak wave produced a brief enhancement in mid-level warm advection, and with around 1000 J/kg elevated CAPE and marginal shear, a few storms developed with broad rotation and resulted in spotty large hail and damaging wind gusts.
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The episode as NWS FSD wrote it up.
A weak wave produced a brief enhancement in mid-level warm advection, and with around 1000 J/kg elevated CAPE and marginal shear, a few storms developed with broad rotation and resulted in spotty large hail and damaging wind gusts.
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 Jul 23, 9:00 PM CST, 5 hours 18 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1000 PM CDT Sun Jul 23 2023 .SHORT TERM...(This Evening through Monday) Issued at 214 PM CDT Sun Jul 23 2023 Showers and thunderstorms will again be possible this evening, but there is a better chance for late night and early Monday morning storms. Late this afternoon into the early evening an isolated stronger storm will be possible near and west of the Missouri River. If a storm could develop in this environment, 1500-2000 J/kg of CAPE and 30-40 knots of shear could support an isolated supercell. After this diurnally driven threat, a shortwave in northwest flow aloft will help drive some stronger warm air advection in the low to mid levels. It will try to initially focus near the James River from about 3-9z but may fight a little capping. If enough moisture can move in around 800-700mb, then about 1000 J/kg of elevated CAPE will be available with some moderate shear so isolated hail will be possible, possibly to quarters or half dollars. Later tonight into Monday morning, from about 9z to 15z, this forcing will spread east to around and east of I-29. With moderate instability and shear scattered strong to severe storms are expected with half dollar hail the main threat.Some drier air in the sub cloud layer could support stronger wind gusts as well but confidence a little lower. Monday late morning into the afternoon looks to have plenty of lingering instability but strong capping should prevent any development. Otherwise most locations should see highs in the 90s. .LONG TERM...(Monday Night through Sunday) Issued at 214 PM CDT Sun Jul 23 2023 Monday night should prove to be mainly quiet as weak mid level ridging builds into the area. Lows mainly in the mid and upper 60s. Tuesday will see a shortwave approach from the west but at least during the day a strong capping inversion should keep convective activity at bay. Will add a small chance in central SD where the cap will be weakest. Temperatures will be very warm, especially west of I- 29 where mid and upper 90s are expected. Near and east of I-29upper 80s to lower 90s are expected. As the shortwave moves through Tuesday night a small chance for storms is needed. Maybe an isolated severe storm. Otherwise very warm with lows in the mid and upper 60s. Ridging aloft continues to remain entrenched across the Central and Southern Plains Wednesday into Thursday with stronger westerly jet energy just north of the area. This should continue to bring the potential for isolated to scattered thunderstorms along with hot conditions. Right now the better chance for storms appears to be Thursday and Thursday night. Wednesday and Thursday should also be a couple of the hottest days with the best chance for heat advisory criteria being met. Highs mostly 90s with lows upper 60s to lower 70s. Not much changes for Friday into Sunday as the pattern continues to support weak energy moving through the faster flow just north of the area. Highs generally mid 80s to mid 90s with spotty chances for showers and storms. && .AVIATION...(For the 06Z TAFS through 06Z Monday Night) Issued at 1000 PM CDT Sun Jul 23 2023 Confidence continues to increase in overnight thunderstorm development. Have now included VCTS in all TAF sites TAFs. The location for storms tonight looks to be mainly between the James River Valley and I-29. This places the bulk of the storms between TAF sites rather than directly over any individual terminal. This may change but for now do not have any TEMPO groups. Should see storms develop after 1 am and continue through the rest of the overnight hours. After storms move out early tomorrow morning, VFR conditions will take over with light southerly winds slowly turning easterly throughout the afternoon and evening hours. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...08 LONG TERM...08 AVIATION...Meyers
Hazardous Weather Outlook National Weather Service Sioux Falls SD 852 PM CDT Sun Jul 23 2023 IAZ001-012-020-031-NEZ013-014-SDZ038-039-050-052>055-057>071-250200- Lyon-Sioux-Plymouth-Woodbury-Dixon-Dakota-Beadle-Kingsbury-Gregory- Jerauld-Sanborn-Miner-Lake-Brule-Aurora-Davison-Hanson-McCook- Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Lincoln-Bon Homme- Yankton-Clay-Union- 852 PM CDT Sun Jul 23 2023 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Tonight. Scattered thunderstorms are expected tonight into early tomorrow morning, mainly along and west of I-29. Some of these storms may be strong to severe with large hail up to golf ball size and damaging winds to 60 mph being the primary hazards. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Heat builds east across the region today through much of next week. Heat indices may top 100 degrees, with the better chances Tuesday through Thursday. Prepare now to ensure you are ready for the combination of dangerous heat and humidity. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed. IAZ002-003-013-014-021-022-032-MNZ071-072-080-081-089-090-097-098- SDZ040-056-250200- Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Ida-Lincoln-Lyon- Murray-Cottonwood-Nobles-Jackson-Pipestone-Rock-Brookings-Moody- 852 PM CDT Sun Jul 23 2023 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota and east central South Dakota. .DAY ONE...Tonight. Isolated showers and storms are possible tonight into tomorrow morning. Should a storm form, it may have the potential to produce hail up to the size of quarters. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Highs in the 90s are likely, especially Tuesday into Thursday, with heat indices possibly topping 100 degrees. Prepare now to ensure you are ready for the combination of dangerous heat and humidity. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Preliminary Local Storm Report
National Weather Service Sioux Falls SD
229 AM CDT Mon Jul 24 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0217 AM Hail 2 NNE Tyndall 43.02N 97.84W
07/24/2023 E1.75 inch Bon Homme SD Trained Spotter
&&
PSThe Omaha radar (KOAX), 130 km away, was scanning. The volume nearest the first event began at 08:18 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Small tree limbs of 1 to 3 inches in diameter were broken off by thunderstorm wind gusts.
In addition to dime to penny size hail, wind gusts of 50 to 55 mph stripped leaves from trees and broke a few smaller branches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2023Every state in 2023This day in weather historyWarnings in Nebraska, July 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: 1124368, 1124365.