WWA Summary for All Issued by MSO

Flood Watch

Flood Watch
National Weather Service Missoula MT
836 AM MDT Sat Mar 21 2026

.An atmospheric river will bring moderate rain rates to the
mountains of western Montana through Saturday afternoon. This will
fall on a deep primed snowpack leading to the melt increasing. Flows
in rivers and streams may increase and reach bankfull or exceed
their banks.

MTC053-221445-
/O.CON.KMSO.FA.A.0003.000000T0000Z-260322T1800Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln-
836 AM MDT Sat Mar 21 2026

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

* WHAT...Flooding caused by rain and snowmelt continues to be
  possible.

* WHERE...A portion of northwest Montana, including the following
  county, Lincoln.

* WHEN...Through Sunday morning.

* 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. Flooding may occur
  in poor drainage and urban areas. Low-water crossings may be
  flooded. Rockfall is possible.

* ADDITIONAL DETAILS...
  - The atmospheric river will bring moderate rain rates between
    0.10 to 0.25 inches per hour to the Cabinet Mountains between
    9 PM Friday evening and 4 AM MDT Saturday. With conditions
    already primed, creeks could overflow their banks early
    Saturday morning. Landslides and rockfalls are possible on
    windward and leeward sides of the mountains. Ross Creek has
    swelled into nearby ditches and caused water to flow over
    Highway 56 south of Bull Lake.

    The Yaak River and Fisher River are forecast to reach action
    stage by Saturday night.
  - https://www.weather.gov/mso/hydrology

$$

Flood Watch
National Weather Service Missoula MT
836 AM MDT Sat Mar 21 2026

.An atmospheric river will bring moderate rain rates to the
mountains of western Montana through Saturday afternoon. This will
fall on a deep primed snowpack leading to the melt increasing. Flows
in rivers and streams may increase and reach bankfull or exceed
their banks.

MTC061-089-221445-
/O.EXA.KMSO.FA.A.0003.000000T0000Z-260322T1800Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mineral-Sanders-
836 AM MDT Sat Mar 21 2026

...FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING...

* WHAT...Flooding caused by rain and snowmelt continues to be
  possible.

* WHERE...Portions of northwest and west central Montana, including
  the following counties, in northwest Montana, Sanders. In west
  central Montana, Mineral.

* WHEN...Through Sunday morning.

* 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. Flooding may occur
  in poor drainage and urban areas. Low-water crossings may be
  flooded. Rockfall is possible.

* ADDITIONAL DETAILS...
  - The atmospheric river may produce an additional 0.25 to 0.50
    inch of precipitation through 3pm Saturday. With conditions
    already primed, creeks could overflow their banks throughout
    Saturday. Landslides and rockfalls are possible on windward
    and leeward sides of the mountains.
  - https://www.weather.gov/mso/hydrology

$$