First published 9/18/2026, 11:38:15 PM · Last updated 9/18/2026, 11:38:15 PM

Severe Thunderstorm Warning — NWS Grand Junction, CO

The National Weather Service in Grand Junction issued a Severe Thunderstorm Warning beginning 5:15 PM MDT on September 18, 2026 (2026-09-18T23:15:00Z) and extending through 5:45 PM MDT. The warning indicates ongoing severe thunderstorms that may produce damaging winds, large hail, and brief intense rainfall in and near Grand Junction, Colorado.

Categories: severe-weather-and-natural-disasters

Generated scores

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

Confidence: 9/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 7/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 5/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 1/10How 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, hail, and localized flash flooding that threaten people, vehicles, and infrastructure. Residents and travelers in the Grand Junction area should take immediate shelter and avoid driving in affected areas.

Location

Sources

Severe Thunderstorm Warning issued September 18 at 5:15PM MDT until September 18 at 5:45PM MDT by NWS Grand Junction CO

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