Drought conditions remain for the entire month across portions of northwest Iowa with below normal precipitation.
Every event with a place to put it; 2 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 DMX wrote it up.
Drought conditions remain for the entire month across portions of northwest Iowa with below normal precipitation.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jul 31, 11:01 PM CST, 59 minutes earlier.
Area Forecast Discussion National Weather Service Des Moines IA 1201 AM CDT Mon Aug 1 2022 ...Updated for the 06z Aviation Discussion... .DISCUSSION.../Tonight through Sunday/ Issued at 246 PM CDT Sun Jul 31 2022 Key Messages: -Widely scattered possible this evening/overnight mainly north. Additional scattered storm threat on Monday night. -Hot and humid on Tuesday with Heat Index values around 100. -Cooling most areas on Wednesday with some threat of storms. Low level moisture led to stratus lingering for a while across the south this morning eventually transitioning to an extensive cu field this afternoon. This has limited heating as well and had to adjust highs down a bit. Otherwise, morning convection moved into the far north and west around midday but quickly dissipated once inside the forecast areas. Currently watching a surface boundary which is passing into far northwest Iowa. This front is forecast to slide across the forecast area tonight. Soundings indicate some modest instability across the north and west this afternoon but with a cap in place. Sufficient forcing along the boundary is expected to lead to a few storms by late afternoon into the evening over the northwest. Bulk shear would support some organization with any storm that would develop with damaging winds the main concern although an isolated tornado may occur given a nice low level veering profile although the 0-3km instability may limit overall potential. The threat for the widely scattered storms persists along the boundary into tonight, mainly in the north and northeast closer to the better forcing residing in MN and WI. The boundary stalls near the Missouri border on Monday before lifting northward on Monday night. Increasing warm advection and theta-e advection by later Monday is likely to lead to scattered thunderstorm development near the boundary during the evening and preceding north and east with the front. Tuesday is shaping up to be the warmest day of the week with short wave upper ridging approaching the state. Warm advection which intensified on Monday night persist into the day on Tuesday with the possibility of some remaining convection north and east early in the day with theta-e surge departing to the northeast. Otherwise, anticipate deep south to southwest flow across the state with thermal ridging approaching from the west. This good mixing environment along with plenty of insolation should push temperatures quickly upward with widespread mid to upper 90s for the bulk of the forecast area outside of the northeast. Dewpoints are expected to remain mostly in the upper 60s which should keep heat index values from climbing much above 100 by afternoon, generally just below advisory criteria. The thermal ridge moves into the state on Tuesday night into Wednesday morning helping to support very warm overnight lows. Surface winds are also expected to keep at least marginal near surface mixing ongoing overnight supporting lows in the mid 70s to lower 80s. The surface front pushes into the northwest on Wednesday clearing the northwest half or so of the state by midday. The boundary along with some isold/sct threat of storms and increased clouds should keep readings cooler across the north and west but still above normal. The highest readings are reserved for the southeast where readings in the mid to upper 90s seem reasonable prior to frontal passage. Additional convection is expected by Wednesday afternoon/evening but this appears mostly in the east where better mid level forcing supports more robust convection. The thermal ridge retreats westward on Thursday and for much of Friday behind the boundary with slightly cooler temperatures, especially in the east. Thereafter, the upper ridging continues to persist across the western into central United States with periodic shortwaves riding along the northern edge near the US/Canadian border. With forcing limited near Iowa, any convection beyond this time appears somewhat isolated and unorganized for the most part. With above normal heights continuing, temperatures are likely to remain above normal. This may hasten expanding drought conditions into the state with no major change in the pattern for quite some time. && .AVIATION.../For the 06Z TAFS through 06Z Monday night/ Issued at 1200 AM CDT Sun Jul 31 2022 VFR conditions expected to prevail through the period. Although a few storms were able to materialize this evening, all have moved into E IA. Although can't completely rule out a rogue -SHRA/-TSRA along a south moving cold front here early this morning, confidence too low to include mention at KDSM or KOTM. Winds will turn from SW to NW with FROPA and persist through the daylight hours on Monday. && .DMX WATCHES/WARNINGS/ADVISORIES... NONE. && DISCUSSION...Cogil AVIATION...Hahn
Hazardous Weather Outlook National Weather Service Des Moines IA 323 PM CDT Sun Jul 31 2022 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-012030- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper- Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union- Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne- Appanoose-Davis- 323 PM CDT Sun Jul 31 2022 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Isolated thunderstorms are possible this evening. There is a marginal risk of severe weather with damaging winds being the primary threat. .DAYS TWO THROUGH SEVEN...Monday through Saturday Isolated thunderstorms are possible Monday night and Wednesday afternoon. The severe weather threat is low for Monday. Wednesday's severe weather risk will be evaluated in the coming days. Hot temperatures and humidity are forecast to send heat indices well into the 100s through the middle of this week. Overnight low temperatures may not drop below 70 on some nights. .SPOTTER INFORMATION STATEMENT... Spotters may be needed tonight.
The national radar mosaic for the moment the first event began.
2 drought. Local standard time, as filed.
Drought continued the entire month across portions of Palo Alto county due to lack of rainfall.
Drought continued the entire month across portions of Pocahontas county due to lack of rainfall.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2022Every state in 2022This day in weather historyWarnings in Iowa, August 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: 1054685, 1054686.