Conditions averaged cooler than normal (2 to 3 degrees below normal) and dry (50-75 percent of normal) across northwest Iowa during July and resulted in generally unchanged drought conditions.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Conditions averaged cooler than normal (2 to 3 degrees below normal) and dry (50-75 percent of normal) across northwest Iowa during July and resulted in generally unchanged drought conditions.
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 Jun 30, 9:41 PM CST, 2 hours 19 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1041 PM CDT Fri Jun 30 2023 .SHORT TERM...(This Evening through Saturday) Issued at 209 PM CDT Fri Jun 30 2023 While the scattered showers and very isolated thunderstorms have left the area with relatively stable air, a small ribbon of instability will exist through the afternoon into the evening from central SD east down the Missouri River into parts of northwest IA. Given only weaker instability, about 1000 J/kg, weaker shear and slow storm motion the main concerns will be locally heavy rainfall. Even the activity this morning left a couple of very small areas with 1.50" to 2.50" of rainfall. Once again the more organized area of thunderstorms should be across Nebraska tonight with some of that activity spreading north towards the Missouri River into northwest IA late tonight into Saturday morning. While some isolated activity will be possible on Saturday and Saturday night the better chances will continue to slowly drift southeast through the day and night. Relatively mild conditions are expected with lows in the 60s tonight and Saturday night and highs Saturday mostly in the 80s, warmest in central SD where more sunshine is expected. .LONG TERM...(Saturday Night through Friday) Issued at 209 PM CDT Fri Jun 30 2023 SUN-MON: Zonal upper flow and height rises beginning Sunday. Light southerly winds bring WAA and warm temperatures. Temperatures at the 850 mb level will approach the mid 20s C which will translate to surface temperatures in the 90s for our western counties, upper 80s for the eastern counties. The SPG tightens ahead of the upper trough and surface cold front Monday afternoon. Winds increase slightly but remain out of the south until the front passes through on Tuesday. Highs for Monday will be widespread 90s. TUE: An upper trough and associated surface cold front begin to influence the area late Monday night/early Tuesday morning. Model guidance is still in low agreement on timing of the frontal passage. Increasing moisture, shear (20-30 kts), and instability (SB and MU CAPE ~ 1500-2000 J/kg, Lapse rates ~ 7-8 C/km) indicate some more organized convection is possible. CIN (100-130 J/kg) may inhibit convection initiation but if we can overcome that a few stronger storms are possible. WED-FRI: A few subtle waves keep precipitation chances in our forecast through Wednesday. After that, high pressure builds in again, with light northerly winds keeping our temperatures for the rest of the week in the 70s and low 80s. && .AVIATION...(For the 06Z TAFS through 06Z Saturday Night) Issued at 1039 PM CDT Fri Jun 30 2023 VFR conditions will likely continue for the rest of the TAF period. Taking a look across the area, most of the showers and thunderstorms have dissipated leaving behind a bit of stratus mostly south of I-90. Another round of showers and thunderstorm could develop south of the Hwy-20 by daybreak in response to a weak mid-level shortwave. However, the latest runs of high resolution guidance continues to shift the precipitation chances further southwards. While confidence in precipitation occurrence is lowering, had enough confidence to leave VCTS in the KSUX TAF just in case an isolated thunderstorm decides to develop northwards of model trends. Otherwise, light and variable winds overnight will become light and northerly to northeasterly through the day tomorrow as the TAF period comes to a close. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...08 LONG TERM...AJP AVIATION...Gumbs
Hazardous Weather Outlook National Weather Service Sioux Falls SD 339 PM CDT Fri Jun 30 2023 IAZ001>003-014-MNZ071-072-080-081-089-090-097-098-SDZ038>040-052>062- 064>067-012045- Lyon-Osceola-Dickinson-Clay-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner-Lake- Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-Douglas- Hutchinson-Turner- 339 PM CDT Fri Jun 30 2023 This Hazardous Weather Outlook is for northwest Iowa, southwest Minnesota, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...This afternoon and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Thursday. High temperatures and heat indices in the 90s are expected to build into parts of the region by Sunday and Monday. The heat and humidity may linger into the 4th of July holiday. Scattered thunderstorm potential will increase for the 4th of July and into Wednesday. While the risk for severe storms remains uncertain, those planning on attending or hosting outdoor activities will want to monitor their local forecast. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ012-013-020>022-031-032-NEZ013-014-SDZ050-063-068>071-012045- Sioux-O'Brien-Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon- Dakota-Gregory-Charles Mix-Bon Homme-Yankton-Clay-Union- 339 PM CDT Fri Jun 30 2023 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, northeast Nebraska, south central South Dakota and southeast South Dakota. .DAY ONE...This afternoon and tonight. Scattered showers and thunderstorms will continue into the overnight hours mostly south of I-90. While severe storms are not expected, a few slow moving storms could produce locally heavy rainfall and a few isolated funnel clouds. .DAYS TWO THROUGH SEVEN...Sunday through Thursday. High temperatures and heat indices in the 90s are expected to build into parts of the region by Sunday and Monday. The heat and humidity may linger into the 4th of July holiday. Scattered thunderstorm potential will increase for the 4th of July and into Wednesday. While the risk for severe storms remains uncertain, those planning on attending or hosting outdoor activities will want to monitor their local forecast. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
7 drought. Local standard time, as filed.
Severe (D2) drought conditions persisted through July.
Severe (D2) drought conditions persisted through July.
Severe (D2) drought conditions persisted through July.
Severe (D2) drought conditions persisted through July.
Severe (D2) drought conditions persisted through July.
Extreme (D3) drought conditions persisted through July.
Severe (D2) drought conditions improved to moderate (D1) in mid-July.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2023Every state in 2023This day in weather historyWarnings in Iowa, 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: 1122593, 1122594, 1122595, 1122596, 1122597, 1122598, 1122599.