Flash Flood Watch
Flood Watch
National Weather Service Great Falls MT
350 AM MDT Wed Aug 12 2026
MTZ319-320-323-122300-
/O.NEW.KTFX.FF.A.0004.260812T2200Z-260813T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Helena Valley-Big Belt, Bridger and Castle Mountains-Canyon Ferry
Area-
Including the cities of Townsend, Maudlow, Deep Creek Pass, Helena,
Bozeman Pass, Trident, Battle Ridge Pass, Toston, and Winston
350 AM MDT Wed Aug 12 2026
...FLASH FLOOD WATCH FOR THE HORSE GULCH BURN SCAR IN EFFECT FROM
THIS AFTERNOON THROUGH LATE TONIGHT...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
are possible over the Horse Gulch burn scar.
* WHERE...A portion of central Montana, including the following
areas, Horse Gulch burn scar, including Riverside Campground.
* WHEN...From this afternoon through late tonight.
* 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 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, urbanized
street flooding, 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
Thursday and Friday, and additional flood statements might be
needed for those days as well.
- Some locations that may experience flash flooding include...
Horse Gulch burn scar and Riverside Campground.
- For flood safety, go to this web page.
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.
&&
$$
Brusda
Flood Watch
National Weather Service Pocatello ID
1243 AM MDT Wed Aug 12 2026
IDZ053-122100-
/O.NEW.KPIH.FF.A.0004.260813T1800Z-260814T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upper Snake River Plain-
Including the cities of Idaho Falls, Rexburg, and St. Anthony
1243 AM MDT Wed Aug 12 2026
...FLASH FLOOD WATCH FOR THE BIG ROCK BURN SCAR IN EFFECT FROM
THURSDAY AFTERNOON THROUGH THURSDAY EVENING...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
are possible over the Big Rock burn scar.
* WHERE...The Big Rock burn scar near Heise.
* WHEN...From Thursday afternoon through Thursday evening.
* IMPACTS...Heavy rainfall over the Big Rock burn scar is possible
Thursday afternoon into Thursday evening. Anyone in or near the Big
Rock burn scar should prepare for potential debris flow moving
through the Big Rock burn scar. Be sure to stay up to date with
information from local authorities. Heavy rainfall could trigger
flash flooding and debris flows in and near recent wildfire burn
scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall near the Big Rock burn scar, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Heise.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
&&
$$
13
Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Spokane WA
1129 PM PDT Tue Aug 11 2026
A weather system will move through the area on Wednesday,
bringing scattered showers and thunderstorms to the region. These
thunderstorms will mainly be focused along the eastern slopes of
the Cascades and along the International Border. Lightning
strikes will have the potential to start new wildfires, and gusty
and erratic outflow winds could cause dangerous conditions around
new and existing wildfires.
IDZ101-WAZ696>706-130600-
/O.CON.KOTX.FW.W.0018.260812T1800Z-260813T0600Z/
Northern and Central Idaho Panhandle (Zone 101)-
East Washington Central Cascades (Zone 696)-
East Portion of North Cascades National Park/Lake Chelan National
Recreation Area (Zone 697)-
East Washington North Cascades (Zone 698)-
Okanogan Highlands and Kettle Mountains (Zone 699)-
Selkirk Mountains of Northeast Washington (Zone 700)-
Foothills of Northeast Washington (Zone 701)-
Colville Reservation (Zone 702)-Okanogan Valley (Zone 703)-
Methow Valley (Zone 704)-
Foothills of Central Washington Cascades (Zone 705)-
Waterville Plateau (Zone 706)-
1129 PM PDT Tue Aug 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 11 PM PDT
WEDNESDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 101, 696, 697,
698, 699, 700, 701, 702, 703, 704, 705, AND 706...
* Affected Area: Northern and Central Idaho Panhandle (Zone
101), East Washington Central Cascades (Zone 696), East
Portion of North Cascades National Park/Lake Chelan National
Recreation Area (Zone 697), East Washington North Cascades
(Zone 698), Okanogan Highlands and Kettle Mountains (Zone
699), Selkirk Mountains of Northeast Washington (Zone 700),
Foothills of Northeast Washington (Zone 701), Colville
Reservation (Zone 702), Okanogan Valley (Zone 703), Methow
Valley (Zone 704), Foothills of Central Washington Cascades
(Zone 705) and Waterville Plateau (Zone 706).
* Thunderstorms: Scattered showers and thunderstorms will be
possible late morning through late evening Wednesday.
* Outflow Winds: Gusty and erratic outflow winds up to 40 mph will
be possible.
* Impacts: Lightning strikes will have the potential to start new
fires, and gusty and erratic outflow winds could cause
dangerous conditions around new and existing wildfires.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
Lake Wind Advisory
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
222 AM MDT Wed Aug 12 2026
MTZ003-130600-
/O.NEW.KMSO.LW.Y.0002.260813T0000Z-260813T0600Z/
Flathead/Mission Valleys-
222 AM MDT Wed Aug 12 2026
...LAKE WIND ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT
MDT TONIGHT...
* WHAT...Northeast winds 15 to 25 mph with gusts up to 40 mph
expected.
* WHERE...Flathead Lake and smaller lakes across the Flathead and
Mission Valley region.
* WHEN...From 6 PM this evening to midnight MDT tonight.
* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters on area lakes should use extra caution since strong winds and
rough waves can overturn small craft.
&&
$$
AL
Fire Weather Watch
URGENT - FIRE WEATHER MESSAGE
National Weather Service Boise ID
127 PM MDT Tue Aug 11 2026
...MONSOON MOISTURE WILL BRING SCATTERED THUNDERSTORMS THURSDAY...
A push of monsoon moisture will bring scattered thunderstorms to
the region Thursday afternoon through Friday morning. Lingering
dry surface air will limit the rainfall amounts on Thursday,
increasing concern for lightning ignitions.
IDZ400>403-420-421-423-424-426-ORZ672>674-122100-
/O.NEW.KBOI.FW.A.0008.260813T2100Z-260814T1200Z/
Northern Boise BLM-Western Payette National Forest-
Eastern Payette National Forest-Northern Boise National Forest-
Treasure Valley BLM-
Southern Boise/Western Sawtooth NF, including the Camas Prairie-
Owyhee Mountains-Western Twin Falls BLM-Southern Highlands-
Southern Grasslands-Central Canyonlands-Northwestern Vale BLM-
127 PM MDT Tue Aug 11 2026 /1227 PM PDT Tue Aug 11 2026/
...FIRE WEATHER WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
LATE THURSDAY NIGHT FOR LIGHTNING FOR NORTHERN BOISE BLM...
WESTERN PAYETTE NATIONAL FOREST...EASTERN PAYETTE NATIONAL
FOREST...NORTHERN BOISE NATIONAL FOREST...TREASURE VALLEY BLM...
SOUTHERN BOISE/WESTERN SAWTOOTH NF, INCLUDING THE CAMAS PRAIRIE...
OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS...
SOUTHERN GRASSLANDS...CENTRAL CANYONLANDS AND NORTHWESTERN VALE
BLM...WHICH ARE FIRE WEATHER ZONES 400...401...402...403...420...
421...423...424...426...672...673 AND 674...
The National Weather Service in Boise has issued a Fire Weather
Watch for lightning, which is in effect from Thursday afternoon
through late Thursday night.
* AFFECTED AREA...In Idaho, Fire Weather Zones 400 Northern
Boise BLM, 401 Western Payette National Forest, 402 Eastern
Payette National Forest, 403 Northern Boise National Forest,
420 Treasure Valley BLM, 421 Southern Boise/Western Sawtooth
NF, including the Camas Prairie, 423 Owyhee Mountains, 424
Western Twin Falls BLM and 426 Southern Highlands. In Oregon,
Fire Weather Zones 672 Southern Grasslands, 673 Central
Canyonlands and 674 Northwestern Vale BLM.
* TIMING...From Thursday afternoon through early Friday morning.
* THUNDERSTORMS...Scattered coverage with abundant lightning.
* OUTFLOW WINDS...Gusty erratic winds up to 40 mph.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Fire Weather Watch means that critical fire weather conditions
are possible. Listen for later forecasts and possible Red Flag
Warnings.
&&
$$
L
Air Quality Alert
MTC001-023-039-057-063-081-093-131500-
Air Quality Alert
Relayed by National Weather Service Great Falls MT
815 AM MDT Wed Aug 12 2026
...AIR QUALITY ALERT IN EFFECT...
The Montana Department of Environmental Quality has issued an air
quality alert for Beaverhead, Deer Lodge, Granite, Silver Bow,
Madison, Missoula, Ravalli counties in effect until 9AM on 08/13/2026
An Air Quality Alert means that particulates have been trending
upwards and that an exceedance of the 24 hour National Ambient Air
Quality Standard (NAAQS) has occurred or may occur in the near
future.
Elevated particulate levels from wildfire smoke
As of 8AM on 08/12/2026, particulate levels in Dillon are Unhealthy.
As of 8AM on 08/12/2026, particulate levels in Frenchtown and
Missoula are Unhealthy for Sensitive Groups.
As of 8AM on 08/12/2026, particulate levels in Billings, Butte,
Choteau, Columbia Falls, Cut Bank, Great Falls, Hamilton, Havre,
Helena, Lewistown, Libby, Malta, Sleeping Giant, Thompson Falls and
West Yellowstone are Moderate.
When air quality is Unhealthy... State and local health officials
recommend that people with respiratory or heart disease, the elderly,
and children should avoid prolonged exertion; everyone else should
limit prolonged exertion.
When air quality is Unhealthy for Sensitive Groups... State and local
health officials recommend that people with respiratory or heart
disease, the elderly and children should limit prolonged exertion.
When air quality is Moderate... State and local health officials
recommend that unusually sensitive people should consider reducing
prolonged or heavy exertion.
For more information visit the Montana Department of Environmental
Quality at http://todaysair.mtdeq.us
$$
ORC013-017-023-031-061-063-065-069-131900-
Crook-Deschutes-Grant-Jefferson-Union-Wallowa-Wasco-Wheeler-
Including the cities of Prineville, Post, Paulina, Bend, Redmond,
Sunriver, Sisters, La Pine, Brothers, John Day, Monument, Dayville,
Long Creek, Seneca, Madras, Warm Springs, Culver, La Grande, Elgin,
Union, North Powder, Enterprise, Joseph, Wallowa..Imnaha, Troy,
Lostine, The Dalles, Maupin, Shaniko, Tygh Valley, Fossil, Spray,
and Mitchell
1247 AM PDT Wed Aug 12 2026
...AIR QUALITY ADVISORY IN EFFECT UNTIL NOON PDT TODAY...
Oregon Department of Environmental Quality has issued an Air Quality
Advisory until noon PDT today.
For the Smoke Air Quality Advisory, wildfires burning in the region
combined with forecasted conditions will cause air quality to reach
unhealthy levels.
Pollutants in smoke can cause burning eyes, runny nose, aggravate
heart and lung diseases, and aggravate other serious health
problems. Limit outdoor activities and keep children indoors if it
is smoky. Please follow medical advice if you have a heart or lung
condition.
For additional information...please visit the Web site at
http://www.oregon.gov/DEQ
$$
IDC017-021-122300-
Bonner-Boundary-
Including the cities of Sandpoint, Priest River, Blanchard,
Careywood, Clark Fork,, Bonners Ferry, Moyie Springs, Porthill,
Eastport, and Naples
1135 AM PDT Tue Aug 11 2026
An Air Quality Alert has been issued by the following agencies:
Idaho Department of Environmental Quality in Coeur d`Alene
Environmental Protection Agency
...AIR QUALITY ADVISORY FROM THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY FOR Boundary, Bonner, Counties...
* WHAT...Air Quality Advisory because of degraded air quality due to
wildfire smoke. Air Quality Index is forecast to be Unhealthy.
* WHERE...Boundary, Bonner Counties...
* WHEN...Next update 12 PM August 14th.
* IMPACTS...Some members of the general public may experience health
effects; members of sensitive groups may experience more serious
health effects.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Air pollutants can cause breathing difficulties for children, the
elderly, as well as persons with respiratory problems. Those
individuals who are sensitive to increased particulate matter or
smoke are encouraged to avoid prolonged or strenuous outdoor
activity during this advisory. Open burning is prohibited by air
quality rule. It is also recommended that all other individuals
limit prolonged or strenuous activity outdoors.
THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY, AIR QUALITY GROUP FOR MORE INFORMATION, CONTACT DEQ`s
Coeur d`Alene Regional Office at (208) 769-1422
$$
IDC057-061-069-122300-
Latah-Lewis-Nez Perce-
Including the cities of Moscow, Potlatch, Deary, Genesee, Juliaetta,
Kendrick, Kamiah, Craigmont, Nezperce, Winchester, Lewiston, Lapwai,
Peck, Culdesac, and Gifford
1135 AM PDT Tue Aug 11 2026
An Air Quality Alert has been issued by the following agencies:
Idaho Department of Environmental Quality in Lewiston
Nez Perce Tribe
...AIR QUALITY ADVISORY FROM THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY FOR Clearwater, Idaho, Latah, Lewis, and Nez Perce
Counties...
* WHAT...Air Quality Advisory because of degraded air quality due to
wildfire smoke. Air Quality Index is forecast to be Unhealthy for
Sensitive Groups.
* WHERE...Clearwater, Idaho, Latah, Lewis, and Nez Perce Counties...
* WHEN...Next update 3 PM August 12th.
* IMPACTS...Members of sensitive groups may experience health
effects. The general public is less likely to be affected.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Air pollutants can cause breathing difficulties for children, the
elderly, as well as persons with respiratory problems. Those
individuals who are sensitive to increased particulate matter or
smoke are encouraged to avoid prolonged or strenuous outdoor
activity during this advisory. Open burning is prohibited by air
quality rule. It is also recommended that all other individuals
limit prolonged or strenuous activity outdoors.
THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY, AIR QUALITY GROUP FOR MORE INFORMATION, CONTACT DEQ`s
Lewiston Regional Office at (208) 799-4370
$$
WAC001-003-007-017-019-023-025-043-047-051-063-065-075-122300-
Adams-Asotin-Chelan-Douglas-Ferry-Garfield-Grant-Lincoln-Okanogan-
Pend Oreille-Spokane-Stevens-Whitman-
Including the cities of Othello, Ritzville, Washtucna, Clarkston,
Asotin, Anatone, Wenatchee, Leavenworth, Cashmere, Entiat, Chelan,
Manson, Plain, East Wenatchee, Bridgeport, Waterville, Douglas,
Republic, Inchelium, Keller, Curlew, Danville, Laurier, Pomeroy,
Moses Lake, Ephrata, Quincy, Mattawa, Royal City, Coulee City,
Davenport, Odessa, Wilbur, Reardan, Sprague, Omak, Okanogan,
Tonasket, Brewster, Oroville, Mazama, Winthrop, Methow, Twisp,
Conconully, Newport, Metaline Falls, Ione, Cusick, Diamond Lake,
Spokane, Airway Heights, Medical Lake, Cheney, Rockford,
Liberty Lake, Deer Park, Colville, Chewelah, Kettle Falls,
Springdale, Northport, Pullman, Colfax, Oakesdale, Rosalia,
La Crosse, and Uniontown
1135 AM PDT Tue Aug 11 2026
An Air Quality Alert has been issued by the following agencies:
Washington Department of Ecology
Colville Confederated Tribes
Environmental Protection Agency
Spokane Regional Clean Air Agency
An Air Quality Alert has been issued for Adams, Asotin, Chelan,
Douglas, Ferry, Garfield, Grant, Lincoln, Okanogan, Pend Oreille,
Spokane, Stevens, and Whitman Counties until further notice due to
current and expected smoke from regional fires. Particulate matter
(PM2.5) may reach Very Unhealthy levels for areas directly downwind
from active wildfires. Other areas may reach Unhealthy for Sensitive
Groups or worse. Intermittent clearing may occur due to windy
conditions, but smoke production continues to be significant.
When air quality is Unhealthy, everyone should reduce exposure.
Limit time outside, avoid strenuous outdoor activity, and follow tips
for cleaner indoor air. When air quality is Very Unhealthy, everyone
should reduce exposure. Stay inside and filter indoor air to keep it
cleaner. Go elsewhere for cleaner air, if needed.
$$
WYZ001>011-019-121800-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Green Mountains and Rattlesnake Range-
Including the cities of Lake, Mammoth, Old Faithful, Clark, Cody,
Meeteetse, Basin, Greybull, Lovell, Powell, Shell, Thermopolis,
Ten Sleep, Worland, Buffalo, Kaycee, and Jeffrey City
1155 AM MDT Tue Aug 11 2026
...AIR QUALITY ALERT IN EFFECT UNTIL NOON MDT WEDNESDAY...
The following message is transmitted on behalf of the Wyoming
Department of Environmental Quality, Air Quality Division, and the
Wyoming Department of Health.
* WHAT...Air Quality Alert for Wildfire Smoke.
* WHERE...Northern Wyoming and portions of central Wyoming.
* WHEN...Until 12 PM Wednesday.
* IMPACTS...Smoke from western United States wildfires and the Weiser
Knoll fire continues to be observed across much of Wyoming. The
smoke is limiting visibilities at times.
HEALTH INFORMATION...The Wyoming Department of Health recommends
that the elderly, young children, and individuals with respiratory
problems avoid excessive physical exertion and minimize outdoor
activities during this time. Wildfire smoke is made up of a variety
of pollutants, including particulate matter and ozone, which can
cause respiratory health effects. Although these people are most
susceptible to health impacts, the Department of Health also advises
that everyone should avoid prolonged exposure to poor air quality
conditions.
CURRENT CONDITIONS...The Wyoming Department of Environmental
Quality, Air Quality Division offers near real-time air quality data
for Wyoming`s monitoring stations and health effects information to
help the public interpret current conditions. Current air quality
conditions across the state of Wyoming can be found at
http://www.wyvisnet.com/.
$$
IDC001-003-027-045-073-075-087-121900-
Ada-Adams-Canyon-Gem-Owyhee-Payette-Washington-
850 PM MDT Mon Aug 10 2026
...AIR QUALITY ADVISORY FROM THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY FOR Ada, Adams, Canyon, Gem, Owyhee, Payette, and Washington
Counties...
* WHAT...Air Quality Advisory because of degraded air quality due to
wildfire smoke.
Air Quality Index is forecast to be Unhealthy.
* WHERE...Ada, Adams, Canyon, Gem, Owyhee, Payette, and Washington
Counties.
* WHEN...UNTIL 1 PM MDT WEDNESDAY.
* IMPACTS...Everyone may begin to experience health effects; members
of sensitive groups may experience more serious health effects.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Air pollutants can cause breathing difficulties for children, the
elderly, as well as persons with respiratory problems. Those
individuals who are sensitive to increased particulate matter or
smoke are encouraged to avoid prolonged or strenuous outdoor
activity during this advisory. Open burning is prohibited by air
quality rule. It is also recommended that all other individuals
limit prolonged or strenuous activity outdoors.
THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL
QUALITY, AIR QUALITY GROUP FOR MORE INFORMATION, CONTACT DEQ`s
Boise Regional Office at (208) 373-0550
Twin Falls Regional Office at (208) 736-2190
$$
IDC035-049-122100-
Air Quality Alert Message
Idaho Department of Environmental Quality Lewiston ID
Relayed by National Weather Service Missoula MT
438 PM MDT Mon Aug 10 2026 /338 PM PDT Mon Aug 10 2026/
...AIR QUALITY ADVISORY FROM THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY
FOR Clearwater and Idaho Counties...
WHAT: Air Quality Advisory because of degraded air quality due to wildfire
smoke.
Air Quality Index is forecast to be Unhealthy for Sensitive Groups.
WHERE... Clearwater and Idaho Counties outside of reservation boundar
WHEN: Extended until 3:00PM 8/12/2026
IMPACTS: Members of sensitive groups may experience health effects. The
general public is less likely to be affected.
PRECAUTIONARY/PREPAREDNESS ACTIONS:
Air pollutants can cause breathing difficult for children, the elderly, as
well as persons with respiratory problems. Those individuals who are
sensitive to increased particulate matter or smoke are encouraged to avoid
prolonged or strenuous outdoor activity during this advisory. Open burning
is prohibited by air quality rule. It is also recommended that all other
individuals limit prolonged or strenuous activity outdoors.
ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY, AIR QUALITY GROUP.
FOR MORE INFORMATION, CONTACT DEQ`s Lewiston Regional Office at (208) 799-
4370
$$
