A narrow and nearly stationary band of thunderstorms developed across Dixon and northern Dakota Counties during the late afternoon hours. 80 inches 3 miles southwest of Jefferson, SD.
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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 narrow and nearly stationary band of thunderstorms developed across Dixon and northern Dakota Counties during the late afternoon hours. Rainfall estimates of 3 to 5 inches occurred in a very small area from central Dixon to far northwestern Woodbury Counties, with the largest observed rainfall of 5.50 inches 4 miles west of McCook Lake, 2.77 inches at mesonet site AV951 in northern Sioux City, IA, 2.07 inches at river gage SXCI4 along Perry Creek in northern Sioux City, IA 2.01 inches in Concord, NE and 1.80 inches 3 miles southwest of Jefferson, SD.
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 7, 12:10 PM CST, 4 hours 39 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 110 PM CDT Thu Jul 7 2022 .SHORT TERM...(This Evening through Friday) Issued at 110 PM CDT Thu Jul 7 2022 Showers and thunderstorms will remain possible tonight into Friday morning. An ongoing cluster of storms in central SD should persist and move into southeast SD and southwest MN this evening. For now it seems like the better chances will be near and north of I-90. The environment ahead of this cluster of storms is not overly impressive but still supportive of continued development. CAPE values likely in the 1000-2000 J/kg range, DCAPE about 500-700 J/kg with little to no shear to really speak of. With the weak low level flow and not very strong steering flow the storm relative inflow suggests a southeastward movement to this cluster through the afternoon and evening. While severe weather is not impossible, it's pretty unlikely with the expected CAPE and freezing level at 13000 feet AGL. The main threats should be heavy rain, wind gusts of 30 to 50 mph and lightning. The weak troughiness helping drive this activity should move east of the area mid to late morning Friday bringing an end to the chances for Friday afternoon. Lows tonight will be in the 60s and highs on Friday in the 80s. Still a bit on the humid side with fairly light easterly flow. .LONG TERM...(Friday Night through Thursday) Issued at 110 PM CDT Thu Jul 7 2022 Friday night into Saturday will see upper level ridging build into the area so not expecting any showers or storms. This should bring a southerly wind back to the area, possibly a bit breezy at times. Temperatures will also warm a bit with lows in the mid to upper 60s and highs in the 80s near and east of Interstate 29 and in the 90s to the west. With the expected dew points in the upper 60s the heat index will climb into the mid and upper 90s west of I-29. There should be a decent wave that moves by to the north and increases warm air advection so a few storms could scrape parts of central SD then along highway 14, bit chances farther south drop off pretty quickly. While storms will have trouble developing with a decent cap in place, if they can the instability and shear are plenty strong to support isolated supercells. Saturday night into Sunday night will show the best chance for some stronger to severe storms, especially later Sunday afternoon into Sunday night. The big question Saturday night is whether or not storms can develop in the afternoon with peak heating or later in the evening with the wave the moves by to the north and stirs up some warm advection. The ridge flattens on Sunday and turns low level flow a little more southwest with a front expected to move into the area through the afternoon and evening. Ahead of this front will be very hot with a decent chance for heat indices to reach 100 to 105 degrees. We will once again be fighting capping a bit on Sunday but with the stronger forcing suspect development will occur and severe weather is more likely during this time. Plenty of instability, likely about 3500 J/kg and good shear with a solid mid and upper level westerly jet so possibly some supercells to start and potentially develop into a line. It is way too far out to determine what will happen however as any activity Saturday night will play a role in what occurs Sunday afternoon and evening. Monday into Tuesday will see the area on the backside of a large upper level trough with upper level ridging building into the area Wednesday into Thursday. This will keep temperatures at or a little above normal with low chances for showers and thunderstorms. && .AVIATION...(For the 18Z TAFS through 18Z Friday afternoon) Issued at 1229 PM CDT Thu Jul 7 2022 Some patchy MVFR ceilings remain but for the most parts have scoured out to few or scattered. Showers and thunderstorms should become more numerous through the afternoon into the evening, but for now severe storms still appear unlikely. However with any of the storms locally heavy rain, lightning and wind gusts around 40 mph will be possible. The better chances for the stronger winds will be north of I-90. If the showers and storms are numerous enough the MVFR fog and stratus later tonight will be less likely, so confidence in that development is low. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...08 LONG TERM...08 AVIATION...08
Hazardous Weather Outlook National Weather Service Sioux Falls SD 954 AM CDT Thu Jul 7 2022 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-055-056-061-062-065>071-081500- 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- Hutchinson-Turner-Bon Homme-Yankton-Union- 954 AM CDT Thu Jul 7 2022 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Scattered showers and thunderstorms are expected today through tonight. An isolated storm could be strong to severe, although the risk is very low. Locally heavy rainfall is possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Temperatures rise for the upcoming weekend, with heat index values rising above 95 degrees on Sunday. Chances for storms return later Sunday. Although details are uncertain, strong to severe storms may be possible Sunday afternoon and Sunday night. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. SDZ038-039-050-052>054-057>060-063-064-081500- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Brule-Aurora- Davison-Hanson-Charles Mix-Douglas- 954 AM CDT Thu Jul 7 2022 This Hazardous Weather Outlook is for portions of central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Strong thunderstorms will be possible this afternoon into the evening.The main threats from these storms will be wind gusts of 30 to 50 mph and locally heavy rainfall. .DAYS TWO THROUGH SEVEN...Friday through Wednesday The thunderstorm threat returns this weekend. Isolated storms will be possible Saturday afternoon and evening but confidence is fairly low. The better chances will be Sunday when a few strong to severe storms are possible. Temperatures rise for the upcoming weekend, with afternoon heat indices in the mid and upper 90s both Saturday and Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service Sioux Falls SD 347 PM CDT Thu Jul 7 2022 IAZ020>022-031-032-NEZ013-014-SDZ039-040-053>056-059>062-065>071- 080000- Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon-Dakota-Kingsbury- Brookings-Sanborn-Miner-Lake-Moody-Davison-Hanson-McCook- Minnehaha-Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Clay-Union- Including the cities of Le Mars, Cherokee, Storm Lake, Sioux City, Ida Grove, Holstein, Battle Creek, Wakefield, Ponca, Allen, South Sioux City, De Smet, Arlington, Lake Preston, Brookings, Woonsocket, Howard, Madison, Orland, Flandreau, Mitchell, Alexandria, Emery, Salem, Canistota, Bridgewater, Montrose, Sioux Falls, Parkston, Freeman, Menno, Tripp, Clayton, Parker, Centerville, Marion, Viborg, Irene, Hurley, Chancellor, Canton, Lennox, Tea, Harrisburg, Tyndall, Scotland, Springfield, Avon, Tabor, Yankton, Vermillion, North Sioux City, Beresford, Elk Point, Alcester, and Jefferson 347 PM CDT Thu Jul 7 2022 Scattered thunderstorms forming along a weak boundary...situated across portions of northwest Iowa, northeast Nebraska, as well as eastern South Dakota...may produce brief funnel clouds. Any funnel clouds that develop are expected to be weak and not touch the ground. However if you feel your safety is threatened please seek shelter.
Special Weather Statement National Weather Service Sioux Falls SD 458 PM CDT Thu Jul 7 2022 IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-080100- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Murray- Cottonwood-Nobles-Jackson-Pipestone-Rock- Including the cities of Rock Rapids, George, Inwood, Larchwood, Sibley, Spirit Lake, Milford, Arnolds Park, Sioux Center, Orange City, Rock Valley, Hawarden, Hull, Sheldon, Hartley, Sanborn, Spencer, Tyler, Hendricks, Lake Benton, Ivanhoe, Marshall, Slayton, Fulda, Windom, Mountain Lake, Worthington, Jackson, Lakefield, Pipestone, and Luverne 458 PM CDT Thu Jul 7 2022 Scattered thunderstorms forming along a weak boundary...situated across eastern South Dakota moving into southwestern Minnesota and northwestern Iowa...may produce brief funnel clouds. Any funnel clouds that develop are expected to be weak and not touch the ground. However if you feel your safety is threatened please seek shelter.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
549 PM CDT THU JUL 7 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0540 PM FLASH FLOOD 3 WNW SIOUX CITY 42.51N 96.44W
07/07/2022 WOODBURY IA PUBLIC
LOCAL LAW ENFORCEMENT HAS REPORTED MULTIPLE
CARS STALLED ON W 19TH STREET IN SIOUX CITY
AND MULTIPLE LOW LYING ROADS FLOODED.
&&
IGThe Sioux Falls radar (KFSD), 128 km away, was scanning. The volume nearest the first event began at 22:45 UTC.
1 flash flood. Local standard time, as filed.
A gravel road was completely washed out near the intersection of 584th Avenue and 870 Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2022Every state in 2022This day in weather historyWarnings in Nebraska, July 2022
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: 1048245.