Alert archive / Nebraska / Red Flag Warnings in 2026

Red Flag Warning 12, NWS Omaha, NE

April 15, 202616 counties in Nebraska; Monona County, Iowa

NWS Omaha, NE issued this red flag warning at Apr 15, 2026, 9:28 PM CDT for 16 counties in Nebraska; Monona County, Iowa. It took effect at Apr 16, 2026, 12:00 PM CDT. It was in force for 8 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: Apr 15, 2026, 9:28 PM CDT (02:28 UTC)
In effect from: Apr 16, 2026, 12:00 PM CDT
Expired: Apr 16, 2026, 7:56 PM CDT
In force: 8 hr
Issued by: NWS Omaha, NE

Counties Monona County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 93 km from the middle of the area, began a volume at 02:32 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, 2.5 hours before the alert went out and 93 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: 34 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1710 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this red flag 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 red flag warning went out at Apr 15, 6:18 PM CDT, 3 hours 10 minutes earlier.

Area forecast discussion, Apr 15, 6:18 PM CDT, 3 hours 10 minutes before

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Hazardous weather outlook, Apr 15, 7:33 PM CDT, 1 hour 55 minutes before

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In the hours before

Local storm report, Apr 15, 3:59 PM CDT, 5 hours 29 minutes before

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Nearby

Red Flag Warnings in Nebraska, 2026 Red Flag Warnings in Iowa, 2026 Every red flag 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.