WWA Summary for Flood Watch Issued by GGW

Flood Watch

Flood Watch
National Weather Service Glasgow MT
201 AM MDT Sat Sep 19 2026

MTZ021-022-025>027-192315-
/O.NEW.KGGW.FA.A.0003.260919T1200Z-260921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Petroleum-Garfield-Dawson-Prairie-Wibaux-
Including Richey, Wibaux, Glendive, Terry, Winnett, and Jordan
201 AM MDT Sat Sep 19 2026

...FLOOD WATCH IN EFFECT FROM 6 AM MDT THIS MORNING THROUGH SUNDAY
AFTERNOON...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...A portion of northeast Montana, including the following
  counties, Dawson, Garfield, Petroleum, Prairie and Wibaux.

* WHEN...From 6 AM MDT this morning through Sunday afternoon.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Creeks and streams may rise out of their banks.

* ADDITIONAL DETAILS...
  - Heavy rain is expected along and south of MT 200 between Winnett,
    Jordan and Glendive and south of I 94 between Glendive and Wibaux
    today, tonight, and Sunday morning. Between one and two inches of
    rain is likely with heavier rain possible in embedded
    thunderstorms.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

&&

$$

Flood Watch
National Weather Service Riverton WY
1154 AM MDT Sat Sep 19 2026

WYZ001>003-007>011-201300-
/O.CON.KRIW.FA.A.0006.000000T0000Z-260921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yellowstone National Park-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 Meeteetse, Mammoth, Old Faithful, Kaycee,
Lake, Buffalo, Clark, and Cody
1154 AM MDT Sat Sep 19 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,
  Cody Foothills and Yellowstone National Park.

* 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 and
    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

Flood Watch
National Weather Service Great Falls MT
1006 AM MDT Sat Sep 19 2026

MTZ319-321-323-326-200000-
/O.CON.KTFX.FA.A.0008.000000T0000Z-260920T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Helena Valley-Meagher County Valleys-Canyon Ferry Area-Gallatin
Valley-
Including the cities of Martinsdale, Checkerboard, White Sulphur
Springs, Helena, Winston, Ringling, Townsend, Toston, Bozeman, and
Gallatin Gateway
1006 AM MDT Sat Sep 19 2026

...FLOOD WATCH REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING...

* WHAT...Flooding caused by excessive rainfall continues to be
  possible.

* WHERE...The Canyon Ferry Area, Helena Valley, and Meagher County
  Valleys in Central Montana

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Excessive runoff may result in flooding of low-lying and
  flood-prone locations.

* ADDITIONAL DETAILS...
  - An area of rain will bring additional precipitation amounts to
    around 0.5 inch today, with locally higher amounts near the
    mountains.
  - Some locations impacted include Helena, Townsend, White Sulphur
    Springs, and Bozeman.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

&&

$$

Moldan

Flood Watch
National Weather Service Billings MT
642 AM MDT Sat Sep 19 2026

.A slow moving weather system will continue to impact the region
through Sunday. Thunderstorms embedded in the more general rainfall
have the potential to produce flash flooding, particularly over
recent burn scars.

MTZ029>034-036-037-040-042-056>058-063>068-138-139-141-169>173-228-
235-WYZ198-199-201245-
/O.CON.KBYZ.FA.A.0004.000000T0000Z-260921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Musselshell-Treasure-Northern Rosebud-Custer-Fallon-Northern
Stillwater-Powder River-Carter-Northern Park-Golden Valley-Red
Lodge Foothills-Northern Big Horn-Southern Rosebud-Judith Gap-
Paradise Valley-Livingston Area-Beartooth Foothills-
Absaroka/Beartooth Mountains-Crazy Mountains-Southern Big Horn-
Southeastern Carbon-Northern Sweet Grass-Bighorn Canyon-Northern
Carbon-Pryor/Northern Bighorn Mountains-Melville Foothills-
Northeastern Yellowstone-Southern Wheatland-Southwestern
Yellowstone-Northeast Bighorn Mountains-Sheridan Foothills-
Including the locations of Red Lodge, Custer, Miles City, Fromberg,
Columbus, Fort Smith, Wilsall, Broadus, Hardin, Lodge Grass, Judith
Gap, Ekalaka, Emigrant, Cooke City, Pompeys Pillar, Ryegate, Hysham,
Livingston, McLeod, Pryor, Lame Deer, Crow Agency, Fishtail, Lavina,
Bridger, Colstrip, Melville, Billings, Sheridan, Big Timber, Forsyth,
Clyde Park, Burgess Jct, Joliet, Roundup, Absarokee, Baker, and
Harlowton
642 AM MDT Sat Sep 19 2026

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

* WHAT...Flooding caused by excessive rainfall is possible, along
  with flash flooding over recent burn scars.

* WHERE...All of South Central and Southeast Montana, and Sheridan
  County Wyoming.

* WHEN...Through Sunday afternoon.

* IMPACTS...Excessive runoff may result in flooding of creeks and
  other low-lying and flood-prone locations. Flooding may occur in
  poor drainage and urban areas.

* ADDITIONAL DETAILS...
  - Total rainfall amounts between 1 and 3 inches will be common
    across the watch area. Locally heavier totals over 4 inches are
    possible where thunderstorm activity is more persistent.
  - The Robertson Draw, East Side, Elk, and McGhee-Remington burn
    scars are particularly vulnerable to Flash Flooding and debris
    flows. Any other burn scars from this summer will have elevated
    Flash Flood potential as well.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please monitor forecasts and be alert for possible Flood Warnings.
Those living in areas prone to flooding should be prepared to take
action should flooding develop.

&&

$$

JKL