Conditions averaged warm (2 to 4 degrees above normal) and dry (50-75 percent of normal) across northwest Iowa during June and resulted in up to a slight worsening of drought conditions.
Every event with a place to put it; 4 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 warm (2 to 4 degrees above normal) and dry (50-75 percent of normal) across northwest Iowa during June and resulted in up to a slight worsening of 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 May 31, 9:34 PM CST, 2 hours 26 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1034 PM CDT Wed May 31 2023 .SHORT TERM...(This Evening through Thursday night) Issued at 251 PM CDT Wed May 31 2023 Compact wave sliding north through northeast SD late this afternoon, with a weak boundary trailing southward into southwest MN/northwest IA. Beyond the boundary and instability (MLCAPE in the 1500-2000 J/kg range), little in the way of forcing to support sustained storms. However, instability combined with weak shear has been enough to support pulsy storms in the vicinity of the boundary, with the strongest of these capable of marginal severe wind/hail and locally heavy rainfall. These storms should weaken as we approach sunset, but could see spotty non-severe showers/storms linger east of I-29 into the overnight. Similar scenario for Thursday, though with no obvious boundary on which to focus storm potential. Expect to see little if any storm activity in the morning with scattered, marginally strong-severe storms popping up through the afternoon/early evening. .LONG TERM...(Friday through Wednesday) Issued at 251 PM CDT Wed May 31 2023 FRIDAY-SUNDAY: Broad upper ridging across the western Great Lakes and Upper Mississippi Valley Friday, with elongated trough from the Pacific Northwest to the central/southern Rockies. The upper ridge is forecast to slowly retrograde westward into the northern Plains and southern Canadian Prairies through the upcoming weekend. With this ridge in place, large scale lift to support organized showers and storms will be limited. However, pattern remains conducive to diurnally-driven activity, largely non-severe with very limited deep layer shear, but with brief heavy rain possible as precipitable water remains near/above the 90th percentile of climatology. Will continue to carry pops through this period, primarily during the afternoon/evening hours. However, feel that the 60-70% pops seen in the NBM are too high given the scattered/pulsy nature of expected activity. Thus have coordinated with neighboring offices to scale daytime pops back into the chance (30-50%) range for Friday and Saturday, with lower values (10-30%) during the overnight/morning hours. MONDAY-WEDNESDAY: Little meaningful change in the pattern early next week, with the upper ridge remaining prominent across the nation's mid-section. Western trough does slide slowly westward toward the California coast, limiting the potential for weak waves sliding up the eastern side of the trough, and thus precipitation chances for this period appear even lower than discussed above for the weekend. Temperatures throughout the mid-long range period will remain above normal, with lows in the upper 50s to mid 60s and highs in the mid 80s to lower 90s. && .AVIATION...(For the 06Z TAFS through 06Z Thursday Night) Issued at 1033 PM CDT Wed May 31 2023 Although an isolated thunderstorm cannot completely be ruled out overnight, most hi-res models indicate very little activity tonight through Thursday morning. Additional Isolated/scattered thunderstorm development will again be possible by Thursday afternoon and evening. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...JH LONG TERM...JH AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 709 PM CDT Wed May 31 2023 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-020015- 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- 709 PM CDT Wed May 31 2023 This Hazardous Weather Outlook is for 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...Tonight. Isolated thunderstorms will remain possible tonight. Severe storms are not expected. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. There will be continued chances for primarily late afternoon and evening thunderstorms Thursday into the weekend. At this time, severe weather is unlikely with these storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
4 drought. Local standard time, as filed.
Severe (D2) drought conditions remained in place through the month.
Extreme (D3) drought conditions remained in place through the month.
Moderate (D1) drought conditions worsened to severe (D2) conditions during early June.
Moderate (D1) drought conditions worsened to severe (D2) conditions during early June.
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, June 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: 1104177, 1104179, 1104176, 1104178.