Alert archive / Iowa / Tornado Warnings in 2024

Tornado Warning 129, NWS Omaha, NE

July 31, 20244 counties in Iowa

NWS Omaha, NE issued this tornado warning at Jul 31, 2024, 6:23 PM CDT for 4 counties in Iowa. It was in force for 37 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 31, 2024, 6:23 PM CDT (23:23 UTC)
Expired: Jul 31, 2024, 7:00 PM CDT
In force: 37 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA

The radar

The Omaha radar (KOAX), 95 km from the middle of the area, began a volume at 23:24 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 31, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 31, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.4 hours before the alert went out and 96 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2475 J/kg
Mixed-layer CIN: -378 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 6:48 AM CDT	Dense Fog Advisory	OAX	Antelope, Cedar, Knox, Pierce	2 hr
Jul 31, 3:52 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Saline, Seward	68 min
Jul 31, 4:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Lancaster	61 min
Jul 31, 4:55 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Cass, Lancaster, Otoe, Saunders	65 min
Jul 31, 5:12 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Douglas, Otoe, Sarpy, Saunders	63 min
Jul 31, 5:19 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Dodge, Douglas, Sarpy, Saunders, Washington	56 min
Jul 31, 5:37 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Cass, Sarpy	53 min
Jul 31, 5:44 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Burt, Dodge, Douglas, Washington	61 min
Jul 31, 5:45 PM CDT	Tornado Warning	OAX	Douglas, Washington	30 min
Jul 31, 6:07 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy	3 hr
Jul 31, 5:53 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Fremont, Mills, Montgomery, Page, Pottawattamie	52 min
Jul 31, 5:55 PM CDT	Tornado Warning	OAX	Pottawattamie	35 min
Jul 31, 6:14 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Harrison, Pottawattamie, Shelby	61 min
Jul 31, 6:14 PM CDT	Tornado Warning	OAX	Harrison	14 min
Jul 31, 6:17 PM CDT	Tornado Warning	OAX	Fremont, Page	28 min
Jul 31, 6:25 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Harrison, Shelby	69 min
Jul 31, 6:29 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Fremont, Montgomery, Page, Pottawattamie	61 min

Nearby

Tornado Warnings in Iowa, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.