Flash Flood Warning
Flash Flood Warning
IDC073-ORC045-152245-
/O.NEW.KBOI.FF.W.0007.260815T2044Z-260815T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boise ID
244 PM MDT Sat Aug 15 2026
The National Weather Service in Boise has issued a
* Flash Flood Warning for...
The Big Grass Fire burn scar in...
Southwestern Owyhee County in southwestern Idaho...
Southeastern Malheur County in southeastern Oregon...
* Until 445 PM MDT.
* At 244 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Big Grass Fire Burn Scar. Flash flooding is
ongoing or expected to begin shortly. Excessive rainfall over the
burn scar will result in debris flow. The debris flow can consist
of rock, mud, vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around the
Big Grass Fire Burn Scar.
SOURCE...Radar indicated.
IMPACT...Flooding of areas in and around the Big Grass Fire Burn
Scar.
* Some locations that will experience flash flooding include...
Star Ranch, Castro Ranch, North Fork Owyhee Campground, Pole Creek
Breaks, Brace Ranch, Hackberry Reservoir, Cutcher Crossing Launch
Site, Twin Springs Ranch, Rickard Crossing, Three Forks River
Access, Piute Basin Reservoir, Castro Ridge, Wiley Ranch, Piute
Butte, Mouse Trap Butte, Four Corners, Garat Crossing Launch Site,
Whitehorse Butte, Grassy Mountain and Juniper Basin Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and ditches
in the Big Grass Fire Burn Scar. Severe debris flows can also be
anticipated across roads. Roads and driveways may be washed away in
places. If you encounter flood waters...climb to safety.
&&
LAT...LON 4265 11742 4288 11693 4291 11698 4281 11674
4272 11669 4277 11694 4276 11694 4262 11705
4261 11705 4263 11657 4261 11656 4259 11688
4258 11689 4224 11640 4206 11641 4205 11642
4205 11661 4225 11668 4223 11692 4240 11690
FLASH FLOOD...RADAR INDICATED
$$
Flash Flood Watch
Flood Watch
National Weather Service Boise ID
1238 PM MDT Sat Aug 15 2026
IDZ013-160300-
/O.CON.KBOI.FF.A.0004.000000T0000Z-260816T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boise Mountains-
Including the cities of Anderson Dam, Pine, and Prairie
1238 PM MDT Sat Aug 15 2026
...FLASH FLOOD WATCH FOR THE WAPITI BURN AREA REMAINS IN EFFECT UNTIL
9 PM MDT THIS EVENING...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Wapiti Burn Area.
* WHERE...A portion of southwest Idaho, including the following area,
Boise Mountains.
* WHEN...Until 9 PM MDT this evening.
* IMPACTS...Heavy rainfall over the Wapiti Burn Area is possible
during the period of the watch. Residents near the Wapiti Burn Area
should prepare for potential debris flow. Be sure to stay up to
date with information from local authorities. Heavy rainfall could
trigger flash flooding or debris flows in and near recent wildfire
burn scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Wapiti Burn Area, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Grandjean.
- https://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
Local emergency services are monitoring the situation and will issue
a public statement as conditions warrant. PLAN NOW so you will know
what to do in an emergency. Keep informed by listening to local radio
and television for statements and possible warnings. Follow the
advice of public safety officials.
&&
$$
JDS
Flood Watch
National Weather Service Pocatello ID
326 AM MDT Sat Aug 15 2026
IDZ072-160300-
/O.CON.KPIH.FF.A.0005.000000T0000Z-260816T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sawtooth/Stanley Basin-
Including the cities of Stanley
326 AM MDT Sat Aug 15 2026
...FLASH FLOOD WATCH FOR THE WAPITI BURN SCAR REMAINS IN EFFECT
THROUGH THIS EVENING...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Wapiti burn scar.
* WHERE...Wapiti Burn Scar west of Stanley.
* WHEN...Through this evening.
* IMPACTS...Heavy rainfall over the Wapiti burn scar is possible
during the period of the watch. Anyone in or near the Wapiti burn
scar should prepare for potential debris flow moving through the
Wapiti 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 over the Wapiti burn scar, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Cape Horn Area and Banner Summit.
- 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.
&&
$$
13
Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Pendleton OR
1238 PM PDT Sat Aug 15 2026
...MONSOON MOISTURE WILL BRING SCATTERED THUNDERSTORMS THROUGH
THIS EVENING...
.A push of monsoon moisture will bring scattered thunderstorms to
the region through this evening. Heavier rainfall is expected
within stronger storms, but lightning outside of rain cores
continues to be a concern.
ORZ692>695-699-WAZ692-693-160400-
/O.CON.KPDT.FW.W.0018.000000T0000Z-260816T0400Z/
Northern Blue Mountains of Oregon-
Canyon Grasslands of Wallowa County-Grande Ronde Valley of Oregon-
Eagle Cap Wilderness-Western Forested Blue Mountains-
Blue Mountains of Washington-
Southeast Washington Grande Ronde Valley-
1238 PM PDT Sat Aug 15 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING
FOR ABUNDANT LIGHTNING FOR FIRE WEATHER ZONES OR692, OR693,
OR694, OR695, OR699, WA692, AND WA693...
* AFFECTED AREA...Fire Weather Zones 692 Northern Blue Mountains
of Oregon, 692 Blue Mountains of Washington, 693 Canyon
Grasslands of Wallowa County, 693 Southeast Washington Grande
Ronde Valley, 694 Grande Ronde Valley of Oregon, 695 Eagle Cap
Wilderness and 699 Western Forested Blue Mountains.
* TIMING...Until 9 PM PDT this evening.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* THUNDERSTORMS...Scattered coverage with abundant lightning.
* OUTFLOW WINDS...Gusty, erratic winds up to 40 mph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.
&&
$$
URGENT - FIRE WEATHER MESSAGE
National Weather Service Spokane WA
1128 AM PDT Sat Aug 15 2026
...SCATTERED THUNDERSTORMS THROUGH SATURDAY...
.A system is moving into and will combine with a southerly push
of monsoonal moisture, bringing scattered thunderstorms to this
region this afternoon and evening. Locally heavy rain is possible
but lightning remains a concern in an area that has been dry,
especially away from the core of any heavy rain. Additionally,
gusty outflow winds from any thunderstorms may impact new or
existing wildfires.
WAZ709-160400-
/O.CON.KOTX.FW.W.0020.260815T1900Z-260816T0400Z/
Lower Palouse - Snake River (Zone 709)-
1128 AM PDT Sat Aug 15 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING
FOR THUNDERSTORMS FOR FIRE WEATHER ZONE 709...
* Affected Area: Lower Palouse -Snake River (Zone 709).
* Thunderstorms: Scattered showers and thunderstorms Saturday
afternoon and evening.
* Outflow Winds: Gusty outflow wind gusts up to 40 mph.
* 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.
&&
$$
URGENT - FIRE WEATHER MESSAGE
National Weather Service Boise ID
759 AM MDT Sat Aug 15 2026
...MONSOON MOISTURE WILL BRING SCATTERED THUNDERSTORMS THROUGH
THIS EVENING...
Scattered thunderstorms are expected to develop early this
afternoon across most districts. These will be a mix of wet and
dry thunderstorms especially across the BLM districts. Heavy rain,
small hail and outflow winds up to 45 mph will be possible with
the strongest storms.
IDZ400-420-423-424-426-160300-
/O.EXB.KBOI.FW.W.0018.260815T1800Z-260816T0300Z/
Northern Boise BLM-Treasure Valley BLM-Owyhee Mountains-
Western Twin Falls BLM-Southern Highlands-
759 AM MDT Sat Aug 15 2026
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS
EVENING FOR LIGHTNING FOR NORTHERN BOISE BLM...TREASURE VALLEY
BLM...OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM AND SOUTHERN
HIGHLANDS...WHICH ARE FIRE WEATHER ZONES 400...420...423...
424 AND 426...
The National Weather Service in Boise has issued a Red Flag
Warning for lightning, which is in effect from noon today to 9 PM
MDT this evening.
* AFFECTED AREA...In Idaho, Fire Weather Zones 400 Northern
Boise BLM, 420 Treasure Valley BLM, 423 Owyhee Mountains, 424
Western Twin Falls BLM and 426 Southern Highlands.
* TIMING...From noon today to 9 PM MDT this evening.
* THUNDERSTORMS...Scattered coverage with abundant lightning.
* OUTFLOW WINDS...Gusty erratic winds up to 45 mph.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will occur shortly.
&&
$$
L
URGENT - FIRE WEATHER MESSAGE
National Weather Service Boise ID
759 AM MDT Sat Aug 15 2026
...MONSOON MOISTURE WILL BRING SCATTERED THUNDERSTORMS THROUGH
THIS EVENING...
Scattered thunderstorms are expected to develop early this
afternoon across most districts. These will be a mix of wet and
dry thunderstorms especially across the BLM districts. Heavy rain,
small hail and outflow winds up to 45 mph will be possible with
the strongest storms.
ORZ672-673-160300-
/O.EXB.KBOI.FW.W.0018.260815T1800Z-260816T0300Z/
Southern Grasslands-Central Canyonlands-
759 AM MDT Sat Aug 15 2026 /659 AM PDT Sat Aug 15 2026/
...RED FLAG WARNING IN EFFECT FROM NOON MDT /11 AM PDT/ TODAY TO
9 PM MDT /8 PM PDT/ THIS EVENING FOR LIGHTNING FOR SOUTHERN
GRASSLANDS AND CENTRAL CANYONLANDS...WHICH ARE FIRE WEATHER ZONES
672 AND 673...
The National Weather Service in Boise has issued a Red Flag
Warning for lightning, which is in effect from noon MDT /11 AM
PDT/ today to 9 PM MDT /8 PM PDT/ this evening.
* AFFECTED AREA...In Oregon, Fire Weather Zones 672 Southern
Grasslands and 673 Central Canyonlands.
* TIMING...From noon MDT /11 AM PDT/ today to 9 PM MDT /8 PM
PDT/ this evening.
* THUNDERSTORMS...Scattered coverage with abundant lightning.
* OUTFLOW WINDS...Gusty erratic winds up to 45 mph.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will occur shortly.
&&
$$
L
URGENT - FIRE WEATHER MESSAGE
National Weather Service Boise ID
759 AM MDT Sat Aug 15 2026
...MONSOON MOISTURE WILL BRING SCATTERED THUNDERSTORMS THROUGH
THIS EVENING...
Scattered thunderstorms are expected to develop early this
afternoon across most districts. These will be a mix of wet and
dry thunderstorms especially across the BLM districts. Heavy rain,
small hail and outflow winds up to 45 mph will be possible with
the strongest storms.
ORZ674-675-160300-
/O.EXT.KBOI.FW.W.0018.000000T0000Z-260816T0300Z/
Northwestern Vale BLM-Baker Valley-
659 AM PDT Sat Aug 15 2026
...RED FLAG WARNING NOW IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR
LIGHTNING FOR NORTHWESTERN VALE BLM AND BAKER VALLEY...WHICH ARE
FIRE WEATHER ZONES 674 AND 675...
* AFFECTED AREA...In Oregon, Fire Weather Zones 674 Northwestern
Vale BLM and 675 Baker Valley.
* TIMING...Until 8 PM PDT this evening.
* THUNDERSTORMS...Scattered coverage with abundant lightning.
* OUTFLOW WINDS...Gusty erratic winds up to 45 mph.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will occur shortly.
&&
$$
L
Special Weather Statement
Special Weather Statement
National Weather Service Missoula MT
338 PM MDT Sat Aug 15 2026
MTZ006-007-152215-
Bitterroot/Sapphire Mountains MT-Butte/Blackfoot Region MT-
338 PM MDT Sat Aug 15 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL POWELL AND
NORTHEASTERN GRANITE COUNTIES UNTIL 415 PM MDT...
At 338 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles north of Philipsburg, or 13 miles southwest of Drummond, moving
northeast at 25 mph.
HAZARD...Wind gusts up to 40 mph and half inch 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...
Drummond, Hall, New Chicago, Maxville, Jens and Goldcreek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
Torrential rainfall is also occurring with this storm and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4635 11338 4643 11354 4680 11313 4657 11283
4635 11337
TIME...MOT...LOC 2138Z 223DEG 20KT 4651 11328
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
$$
TSP
Special Weather Statement
National Weather Service Boise ID
334 PM MDT Sat Aug 15 2026
IDZ012-014-152200-
Upper Treasure Valley ID-Lower Treasure Valley ID-
334 PM MDT Sat Aug 15 2026
...GUST FRONT WILL IMPACT SOUTHERN ADA...SOUTHEASTERN CANYON AND
NORTHWESTERN OWYHEE COUNTIES THROUGH 400 PM MDT...
At 334 PM MDT, Doppler radar was tracking a gust front along a line
extending from 6 miles south of Givens Hot Springs to near Murphy.
Movement was northeast at 30 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible.
Locations impacted include...
Nampa, Kuna, Melba, Swan Falls, Murphy, Initial Point, Guffey,
Walters Ferry, and Lake Lowell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4332 11677 4365 11655 4337 11605 4315 11645
TIME...MOT...LOC 2134Z 214DEG 28KT 4333 11674 4317 11645
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
$$
JY
Special Weather Statement
National Weather Service Spokane WA
207 PM PDT Sat Aug 15 2026
WAZ031-032-152200-
Northeast Blue Mountains WA-Lower Garfield and Asotin Counties WA-
207 PM PDT Sat Aug 15 2026
...A strong thunderstorm will impact portions of south central
Garfield and Asotin Counties through 300 PM PDT...
At 206 PM PDT, Doppler radar was tracking a strong thunderstorm near
Troy, or 30 miles southeast of Dayton, moving northeast at 20 mph.
HAZARD...Winds in excess of 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Anatone, Peola, Wickiup Campground, Cloverland, Misery Spring
Campground, and Spruce Spring Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4616 11761 4639 11749 4619 11697 4600 11710
4600 11760
TIME...MOT...LOC 2106Z 221DEG 17KT 4601 11753
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
$$
Solveig
Air Quality Alert
IDC061-069-161900-
Lewis-Nez Perce-
Including the cities of Kamiah, Craigmont, Nezperce, Winchester,
Lewiston, Lapwai, Peck, Culdesac, and Gifford
1048 AM PDT Sat Aug 15 2026
An Air Quality Alert has been issued by the following agencies:
Nez Perce Tribe
The Air Quality Advisory issued for the Nez Perce Reservation remains
in effect. Wildfire smoke may move in and out of the area depending
on fire and wind activity; some areas may be more impacted than
others.
The advisory has been lifted for areas outside of the Nez Perce
Reservation in Lewis and Nez Perce counties.
$$
Hydrologic Outlook
Hydrologic Outlook
IDC001-003-015-025-027-039-045-073-075-085-087-ORC001-025-045-160300-
Hydrologic Outlook
National Weather Service Boise ID
223 PM MDT Fri Aug 14 2026
Monsoon moisture will bring a threat of thunderstorms to the region
through Saturday evening for much of the area. High atmospheric
moisture will allow for isolated thunderstorms producing heavy rain
accumulations, leading to an increased threat of flash flooding
especially for the recent wildfire burn scars.
Friday and Saturday have the highest chance for locally heavy rains,
especially near the ID-NV border, Baker County, and high terrain in
southwest Idaho.
Burn scars have the highest risk for flash flooding. Several burn
scars across the area are of particular concern for flash flooding
and debris flows, including: the Wapiti burn scar near Grandjean, ID,
the Fox burn scar near Richland, OR, the Powder River burn scar near
Richland, OR, the Tartar burn scar near Weiser, ID, the Coleman Creek
burn scar near Juntura, OR and the Big Grass Fire burn scar near
Jordan Valley, OR. Please monitor the latest weather conditions if
traveling near these areas.
$$
CH
