Flood Watch issued September 18 at 1:10PM MDT until September 20 at

* 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
through Sunday and bring rounds of showers and thunderstorms to
the region, especially northern Wyoming. Any shower or
thunderstorm could produce moderate to heavy rainfall across the
Watch Area.
- http://www.weather.gov/safety/flood