First published 9/19/2026, 5:37:15 AM · Last updated 9/19/2026, 5:37:15 AM

Flash Flood Watch issued September 18 at 11:33PM MDT until September 19 at 12:00AM MDT by NWS Boise ID

National Weather Service Boise issued a Flash Flood Watch 2026-09-18 23:33 MDT–2026-09-19 00:00 MDT for the Boise, Idaho area, indicating conditions are favorable for flash flooding during the covered period.

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: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 4/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 6/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The 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: 7/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

A Flash Flood Watch alerts residents and travelers that flash flooding is possible on a short timescale; people in the affected area should monitor updates, avoid flooded roads, and be prepared to take protective action if conditions worsen.

Location

Sources

Flash Flood Watch issued September 18 at 11:33PM MDT until September 19 at 12:00AM MDT by NWS Boise ID

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