Severe Thunderstorm Warning for Cass, Johnson, Nemaha, Otoe Counties NE
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NWS Omaha/Valley NE has issued a Severe Thunderstorm Warning for four southeastern Nebraska counties until 3:30 AM CDT August 18.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Southeastern Nebraska
- Issued
- August 18, 2026
- Issuing authority
- NWS Omaha/Valley NE
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
The National Weather Service in Omaha/Valley NE issued a Severe Thunderstorm Warning at 2:30 AM CDT on August 18, 2026. The alert is effective immediately and expires at 3:30 AM CDT on August 18, 2026. The event type is Severe Thunderstorm Warning with observed severity, immediate urgency, and observed certainty.
Affected Areas
The warning covers Cass County, Johnson County, Nemaha County, and Otoe County in southeastern Nebraska. Affected locations include Eagle, Greenwood, Palmyra, Douglas, Elmwood, Murdock, Sterling, Unadilla, Syracuse, Weeping Water, Avoca, Cook, Crab Orchard, Tecumseh, Talmage, Nehawka, Dunbar, Lorton, Nebraska City, Johnson, Union, Brock, Elk Creek, and Julian. The storm path also includes Interstate 80 in Nebraska between mile markers 415 and 426.
What You Should Do
For protection, move to an interior room on the lowest floor of a building.
Expected Conditions
At 2:29 AM CDT, severe thunderstorms were located along a line extending from 4 miles north of Waverly to 3 miles southwest of Bennet to 3 miles east of Clatonia, moving east at 50 mph. Hazards include 60 mph wind gusts, with multiple observed wind gusts of 60 to 65 mph. Expect damage to roofs, siding, and trees. Hail threat is radar indicated with max hail size up to 0.75 inches.
Timeline
The warning is in effect from 2:30 AM CDT until 3:30 AM CDT on August 18, 2026.
Original source: NOAA Official Notice ↗
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