Alert archive / Nebraska / Flash Flood Warnings in 2025

Flash Flood Warning 7, NWS Omaha, NE

July 21, 2025Gage County, Jefferson County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jul 21, 2025, 12:16 PM CDT for Gage County, Jefferson County, Nebraska. 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: Jul 21, 2025, 12:16 PM CDT (17:16 UTC)
Expired: Jul 21, 2025, 3:15 PM CDT
In force: 3 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Flood severity: None

Counties Gage County, NE, Jefferson County, NE

The radar

The Grand Island radar (KUEX), 130 km from the middle of the area, began a volume at 17:19 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

Topeka, KS (KTOP), launched 12:00Z, 5.3 hours before the alert went out and 174 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: 1404 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1309 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Jul 21, 12:12 PM CDT, 4 minutes earlier.

Area forecast discussion, Jul 21, 12:12 PM CDT, 4 minutes before

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Hazardous weather outlook, Jul 21, 3:42 AM CDT, 8 hours 34 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
342 AM CDT Mon Jul 21 2025

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-212245-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline-
Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
342 AM CDT Mon Jul 21 2025

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Today and Tonight

A Heat Advisory is in effect for this afternoon and evening when
heat indices will reach 100-109.

Considerable uncertainty exists in thunderstorm potential
again today and tonight. The best chance for locally strong wind
gusts and/or heavy rain will be between 2PM to 10 PM this evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Dangerous heat continues through Wednesday, with heat indices up
to 100-109.

Another round of dangerous heat looks possible next weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 11:33 AM CDT	Flood Watch	OAX	Gage, Jefferson, Johnson, Nemaha, Pawnee, Richardson and 1 more	8 hr

Nearby

Flash Flood Warnings in Nebraska, 2025 Every flash flood warning in 2025

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.