380
WGUS65 KRIW 181910
FFARIW

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Riverton WY
110 PM MDT Fri Sep 18 2026

WYZ001-191300-
/O.EXA.KRIW.FA.A.0006.000000T0000Z-260921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yellowstone National Park-
Including the cities of Old Faithful, Lake, and Mammoth
110 PM MDT Fri Sep 18 2026

...FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON...

* 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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

WYZ002-003-007>011-191300-
/O.CON.KRIW.FA.A.0006.000000T0000Z-260921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Absaroka Mountains-Cody Foothills-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-Northeast
Johnson County-Southeast Johnson County-
Including the cities of Clark, Cody, Kaycee, Buffalo, and Meeteetse
110 PM MDT Fri Sep 18 2026

...FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON...

* WHAT...Flash flooding caused by moderate to heavy rainfall is
  possible, especially in terrain and poor drainage areas.

* WHERE...Portions of central, north central, and northwest Wyoming,
  including the following areas, in central Wyoming, Owl Creek and
  Bridger Mountains. In north central Wyoming, Bighorn Mountains
  Southeast, Bighorn Mountains West, Northeast Johnson County and
  Southeast Johnson County. In northwest Wyoming, Absaroka Mountains
  and Cody Foothills.

* WHEN...Through Sunday afternoon.

* IMPACTS...Excessive rainfall may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Flooding may occur in poor drainage and urban 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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Gerhardt