Alert archive / Iowa / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 169, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 28, 2023, 7:18 PM CDT for 4 counties in Iowa. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 28, 2023, 7:18 PM CDT (00:18 UTC)
- Expired
- Jul 28, 2023, 8:15 PM CDT
- In force
- 57 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 105 km from the middle of the area, began a volume at 00:20 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 28, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 192 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 3767 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1322 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 6.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jul 28, 6:27 PM CDT, 51 minutes earlier.
Area forecast discussion, Jul 28, 6:27 PM CDT, 51 minutes before
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</html>Hazardous weather outlook, Jul 28, 3:26 PM CDT, 3 hours 52 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 326 PM CDT Fri Jul 28 2023 IAZ033-034-044>050-057>062-070>075-081>086-092>097-292030- Sac-Calhoun-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- 326 PM CDT Fri Jul 28 2023 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight An Excessive Heat Warning is in effect for the area through tonight. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Storms are possible by this afternoon and into tonight, especially north of interstate 80. A few storms may be strong to severe, capable of large hail and damaging winds. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Periodic chances for storms return late weekend and early next week. The threat of severe weather is uncertain at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this evening. IAZ004>007-015>017-023>028-035>039-292030- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Webster- Hamilton-Hardin-Grundy-Black Hawk- 326 PM CDT Fri Jul 28 2023 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight A Heat Advisory is in effect for the area through tonight. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Storms are possible by this afternoon and into tonight. A few storms may be strong to severe, capable of large hail and damaging winds. A tornado may be possible as well. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Periodic chances for storms return late weekend and early next week. The threat of severe weather is uncertain at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this evening. Hagenhoff
In the hours before
Local storm report, Jul 28, 6:12 PM CDT, 1 hour 6 minutes before
Preliminary Local Storm Report
National Weather Service Des Moines IA
612 PM CDT Fri Jul 28 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0608 PM Hail 6 SW Geneva 42.60N 93.20W
07/28/2023 E1.50 inch Franklin IA Public
Report from mPING: Ping Pong Ball (1.50
in.).
&&Local storm report, Jul 28, 6:25 PM CDT, 53 minutes before
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</html>Local storm report, Jul 28, 6:26 PM CDT, 52 minutes before
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</html>Local storm report, Jul 28, 6:27 PM CDT, 51 minutes before
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</html>Local storm report, Jul 28, 6:37 PM CDT, 41 minutes before
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</html>Local storm report, Jul 28, 6:40 PM CDT, 38 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 7:50 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 40 min |
| Jul 28, 8:24 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 66 min |
| Jul 28, 10:05 PM CDT | Special Weather Statement | DMX | Mahaska | 25 min |
| Jul 28, 10:34 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Monroe, Wapello | 56 min |
| Jul 28, 11:31 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Monroe, Wapello | 44 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2023Every severe thunderstorm warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.