Severe Thunderstorm Warning Issued for Johnson County, Wyoming
This alert is no longer in effect.
NOAA issued it on July 27, 2026, 4 weeks ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Riverton has issued a Severe Thunderstorm Warning for Johnson County until 5:15 PM MDT on June 20, 2026, with 70 mph wind gusts observed.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Johnson County, Wyoming
- Issued
- July 27, 2026
- Issuing authority
- NWS Riverton WY
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: historical. It was issued 4 weeks ago; use the issuing agency's live warning service for current conditions in Johnson County, Wyoming.
Alert Details
A Severe Thunderstorm Warning has been issued by the National Weather Service in Riverton, WY. The alert is effective from 4:29 PM MDT on June 20, 2026, until 5:15 PM MDT on the same day.
Affected Areas
The warning covers Johnson County in north central Wyoming. The storm was located 10 miles northeast of Mayoworth (17 miles north of Kaycee) and is moving northeast at 45 mph. It will affect mainly rural areas including South Fork Campground, Sussex, Buffalo Johnson County Airport, Lost Cabin Campground, and Johnson County Fairgrounds. Highways impacted include Interstate 25 between mile markers 257 and 299, and Interstate 90 between mile markers 42 and 95.
What You Should Do
For protection, move to an interior room on the lowest floor of a building.
Expected Conditions
At 4:27 PM MDT, radar indicated a severe thunderstorm with 70 mph wind gusts. Considerable tree damage is expected, with damage likely to mobile homes, roofs, and outbuildings.
Timeline
The warning is in effect from 4:29 PM MDT until 5:15 PM MDT on June 20, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,076 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to July 27, 2026.
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