Idaho, Wyoming, Montana Severe Flood Watch | Effective 09/18/2026 12:10
* WHAT...Flash flooding caused by moderate to heavy rainfall is
possible, especially in terrain and poor drainage areas.
* WHERE...Northwest Wyoming, including Yellowstone National Park.
* WHEN...Through Sunday afternoon.
* IMPACTS...Heavy rainfall may result in flooding of rivers, creeks,
streams, and other low-lying and flood-prone locations. Flooding
may occur in poor drainage areas and around steep terrain.
* ADDITIONAL DETAILS...
- A slow moving weather system will move across Wyoming today