Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Special Weather Statement
Area(s): Northern Rosebud
Effective: 2026-08-13 @ 6:47 pm -> 2026-08-13 @ 7:30 pm
Onset: 2026-08-13 @ 6:47 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Billings MT on 2026-08-13 @ 6:47 pm
Headline: Special Weather Statement issued August 13 at 5:47PM MDT by NWS Billings MT
Description: At 547 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles east of Colstrip, moving north at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.

Locations impacted include...
Mainly rural areas of Central Rosebud County.

Alert: Special Weather Statement
Area(s): Missoula/Bitterroot Valleys
Effective: 2026-08-13 @ 6:33 pm -> 2026-08-13 @ 7:30 pm
Onset: 2026-08-13 @ 6:33 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Missoula MT on 2026-08-13 @ 6:33 pm
Headline: Special Weather Statement issued August 13 at 5:33PM MDT by NWS Missoula MT
Description: At 533 PM MDT, Doppler radar was tracking a strong thunderstorm 6
miles north of Victor, or 18 miles north of Hamilton, moving
northeast at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible. Heavy rainfall could cause excess runoff and
debris flows in areas of burn scars or flood prone terrain.

Locations impacted include...
Stevensville.

Alert: Flash Flood Watch
Area(s): Northwest Beaverhead County
Effective: 2026-08-13 @ 11:50 am -> 2026-08-14 @ 1:00 am
Onset: 2026-08-13 @ 2:00 pm -> 2026-08-14 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-08-13 @ 11:50 am
Headline: Flash Flood Watch issued August 13 at 10:50AM MDT until August 14 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Bobcat Lakes and Sand Creek burn
scars in the Pioneer Mountains.

* WHERE...The Pioneer Mountain Range.

* WHEN...Through this evening.

* IMPACTS...Heavy rainfall over the Bobcat Lakes and Sand Creek burn
scars is expected up to and during the period of the watch.
Residents near the Bobcat Lakes and Sand Creek burn scars should
prepare for the potential of debris flows moving through the
Pioneer Mountain Range. Be sure to stay up to date with information
from local authorities. Heavy rainfall could trigger flash flooding
of low-lying areas, and debris flows in and near recent wildfire
burn scars.

* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the burn scar, which may lead to flash flooding and
debris flows. Additional flood statements might be needed for
Friday.
- For flood safety, go to this web page.
http://www.weather.gov/safety/flood

Alert: Flash Flood Watch
Area(s): Big Belt, Bridger and Castle Mountains
Effective: 2026-08-13 @ 11:50 am -> 2026-08-14 @ 1:00 am
Onset: 2026-08-13 @ 7:00 pm -> 2026-08-14 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-08-13 @ 11:50 am
Headline: Flash Flood Watch issued August 13 at 10:50AM MDT until August 14 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Horse Gulch burn scar and the
Riverside Campground.

* WHERE...A portion of central Montana, including the following
areas, Horse Gulch burn scar, including Riverside Campground.

* WHEN...From 6 PM MDT this evening through this evening.

* IMPACTS...Heavy rainfall over the Horse Gulch burn scar is expected
up to and during the period of the watch. Residents near the Horse
Gulch burn scar and Riverside Campground should prepare for
potential debris flow. Be sure to stay up to date with information
from local authorities. Heavy rainfall could trigger flash flooding
of low-lying areas and debris flows in and near recent wildfire
burn scars.

* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Horse Gulch burn scar, which may lead to flash
flooding and debris flows. Additional heavy rainfall is possible
on Friday, and additional flood statements may be needed over the
coming days.
- For flood safety, go to this web page.
http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Elkhorn and Boulder Mountains
Effective: 2026-08-13 @ 11:50 am -> 2026-08-14 @ 1:00 am
Onset: 2026-08-13 @ 3:00 pm -> 2026-08-14 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-08-13 @ 11:50 am
Headline: Flood Watch issued August 13 at 10:50AM MDT until August 14 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...A portion of central Montana, including the following area,
Elkhorn and Boulder Mountains.

* WHEN...From 2 PM MDT this afternoon through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and flood-prone locations such as poor drainage
areas, urban areas, and burn scars.

* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall, which may lead to flash flooding and debris flows on
recent burn scars.
- For flood safety, go to this web page.
http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Butte/Blackfoot Region
Effective: 2026-08-13 @ 11:15 am -> 2026-08-14 @ 1:00 am
Onset: 2026-08-13 @ 3:00 pm -> 2026-08-14 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-08-13 @ 11:15 am
Headline: Flood Watch issued August 13 at 10:15AM MDT until August 14 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...A portion of west central Montana, including the following
area, Butte/Blackfoot Region.

* WHEN...From 2 PM MDT this afternoon through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and flood-prone locations such as poor drainage
areas, urban areas, and burn scars.

* ADDITIONAL DETAILS...
- Scattered thunderstorms with rain rates over a half inch per hour
are expected this afternoon and evening. If thunderstorms with
these rain rates hit susceptible areas such as burn scars and
some urban areas, then the flooding potential is high.
- https://www.weather.gov/mso/hydrology