First published 9/20/2026, 12:49:15 AM · Last updated 9/20/2026, 12:49:15 AM

Severe Thunderstorm Warning — NWS Riverton WY

National Weather Service (NWS) Riverton WY issued a Severe Thunderstorm Warning at 6:37 PM MDT on September 19 (2026-09-20T00:37:00Z). The warning was effective until 7:00 PM MDT that evening. The advisory targets the Riverton, Wyoming area.

Categories: severe-weather-and-natural-disasters, travel-and-transportation

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 7/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 2/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 9/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Severe thunderstorms can produce damaging winds, large hail, and dangerous driving conditions. Residents and travelers in the Riverton area should seek shelter and avoid travel if possible while the warning is in effect.

Location

Sources

Severe Thunderstorm Warning issued September 19 at 6:37PM MDT until September 19 at 7:00PM MDT by NWS Riverton WY

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