Alert archive / Iowa / Flash Flood Warnings in 2026
Flash Flood Warning 34, NWS Omaha, NE
NWS Omaha, NE issued this flash flood warning at Aug 14, 2026, 4:41 AM CDT for Pottawattamie County, Shelby County, Iowa. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 14, 2026, 4:41 AM CDT (09:41 UTC)
- Expired
- Aug 14, 2026, 7:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Flood severity
- None
Counties Pottawattamie County, IA, Shelby County, IA
The radar
The Omaha radar (KOAX), 81 km from the middle of the area, began a volume at 09:40 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 9.7 hours before the alert went out and 82 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
- 1864 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 845 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 214 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 12.2
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Omaha, NE wrote its last area forecast discussion before this flash flood warning went out at Aug 13, 5:45 PM CDT, 10 hours 56 minutes earlier.
Area forecast discussion, Aug 13, 5:45 PM CDT, 10 hours 56 minutes before
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</html>The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 3:34 AM CDT | Severe Thunderstorm Warning | OAX | Butler, Colfax, Dodge, Platte, Saunders | 41 min |
| Aug 14, 3:58 AM CDT | Areal Flood Advisory | OAX | Platte | 107 min |
| Aug 14, 4:02 AM CDT | Flash Flood Warning | OAX | Colfax, Cuming, Dodge | 3 hr |
| Aug 14, 4:07 AM CDT | Severe Thunderstorm Warning | OAX | Burt, Cuming, Dodge, Washington | 37 min |
| Aug 14, 4:21 AM CDT | Tornado Warning | OAX | Burt, Dodge, Washington | 13 min |
| Aug 14, 9:52 AM CDT | Flood Watch | OAX | Burt, Cuming, Dodge, Thurston, Washington | 7 hr |
| Aug 14, 4:16 AM CDT | Flash Flood Warning | OAX | Harrison | 3 hr |
Nearby
Flash Flood Warnings in Iowa, 2026Every flash flood warning in 2026
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.