Severe Thunderstorm Warning Issued for Park and Teton Counties, Wyoming
This alert is no longer in effect.
NOAA issued it on May 21, 2026, 3 months 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 northwestern Park County and northern Teton County until 5:30 PM MDT on May 13.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Park and Teton Counties, Wyoming
- Issued
- May 21, 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 3 months ago; use the issuing agency's live warning service for current conditions in Park and Teton Counties, Wyoming.
Alert Details
A Severe Thunderstorm Warning has been issued by the National Weather Service in Riverton, Wyoming. The alert is effective from 4:27 PM MDT on May 13, 2026, until 5:30 PM MDT on May 13, 2026.
Affected Areas
The warning covers Northwestern Park County in central Wyoming and Northern Teton County in northwestern Wyoming. The storm was located near Macks Inn, 15 miles south of West Yellowstone, and will affect Madison, Firehole Canyon, Harlequin Lake, Gibbons Falls, Norris Junction, Virginia Cascade, Grebe Lake, Canyon, Cascade Lake, Mount Washburn, Dunraven Pass, and Tower Falls.
What You Should Do
Move to an interior room on the lowest floor of a building. Move indoors immediately if on or near a lake, get away from the water and move indoors or inside a vehicle. Large hail, damaging wind, and continuous cloud to ground lightning are occurring with this storm.
Expected Conditions
At 4:27 PM MDT, a severe thunderstorm was located near Macks Inn moving northeast at 60 mph. Hazards include 60 mph wind gusts and hail up to 0.75 inches.
Timeline
The warning is in effect until 5:30 PM MDT on May 13, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
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 (1,148 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 21, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.