Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Pocatello ID
1241 PM MDT Fri Aug 21 2026
...CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED ON SATURDAY DUE
TO SCATTERED THUNDERSTORM ACTIVITY ACROSS MUCH OF EASTERN
IDAHO...
IDZ410-422-425-427-475-476-221200-
/O.NEW.KPIH.FW.W.0022.260822T1800Z-260823T0300Z/
Upper Snake River Valley/Idaho Falls BLM-
Sawtooth Range/Northern Sawtooth NF-
Middle Snake River Valley/Twin Falls BLM north of the Snake River-
Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
BLM south of the Snake River-
East Salmon River Mountains/Salmon NF-
Lemhi and Lost River Range/Challis NF-
1241 PM MDT Fri Aug 21 2026
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SATURDAY FOR
SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 422, 425,
427, 475, AND 476...
The National Weather Service in Pocatello has issued a Red Flag
Warning for scattered thunderstorms, which is in effect from noon
to 9 PM MDT Saturday.
* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
Valley/Idaho Falls BLM, Fire Weather Zone 422 Sawtooth
Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake
River Valley/Twin Falls BLM north of the Snake River, Fire
Weather Zone 427 Goose Creek and Raft River Valley/Southern
Sawtooth NF/Twin Falls BLM south of the Snake River, Fire
Weather Zone 475 East Salmon River Mountains/Salmon NF and
Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF.
* IMPACTS...Frequent lightning will increase risk of new fire
starts.
* THUNDERSTORMS...Scattered coverage with frequent lightning.
* OUTFLOW WINDS...Gusty and erratic winds to 60 mph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly based on these criteria
for Southeastern Idaho:
- Relative humidity at or below 15 percent and wind gusts of at
least 25 mph in the mountains, or 30 mph in the Snake Plain.
- Thunderstorm coverage of 25 percent, without specific rainfall
criteria.
- Other high impact events deemed critical by the National
Weather Service and area fire management agencies.
&&
$$
Heat Advisory
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1248 PM MDT Fri Aug 21 2026
IDZ012-014-220300-
/O.NEW.KBOI.WI.Y.0012.260822T0000Z-260822T0400Z/
/O.CON.KBOI.HT.Y.0007.000000T0000Z-260822T0300Z/
Lower Treasure Valley-Upper Treasure Valley-
Including the cities of Caldwell, Nampa, and Boise
1248 PM MDT Fri Aug 21 2026
...WIND ADVISORY IN EFFECT FROM 6 PM TO 10 PM MDT THIS EVENING...
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING...
* WHAT...For the Heat Advisory, temperatures 98 to 103 degrees. For
the Wind Advisory, south winds 25 to 35 mph with gusts up to 65 mph
expected.
* WHERE...Lower Treasure Valley and Upper Treasure Valley.
* WHEN...For the Heat Advisory, until 9 PM MDT this evening. For the
Wind Advisory, from 6 PM to 10 PM MDT this evening.
* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result. Hot
temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Strong gusts from the south and southwest will
create areas of blowing dust and visibility as low as one mile,
advancing northward through the Snake Basin, with greatest impacts
between 800 PM and 930 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1248 PM MDT Fri Aug 21 2026
IDZ016-033-ORZ064-220300-
/O.CON.KBOI.HT.Y.0007.000000T0000Z-260822T0300Z/
Western Magic Valley-Upper Weiser River-Oregon Lower Treasure
Valley-
Including the cities of Goodrich, Mesa, Nyssa, Cambridge, Fruitvale,
Glendale, Ontario, Twin Falls, Indian Valley, and Council
1248 PM MDT Fri Aug 21 2026 /1148 AM PDT Fri Aug 21 2026/
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT /8 PM PDT/ THIS
EVENING...
* WHAT...Temperatures near 100 degrees.
* WHERE...In Idaho, Western Magic Valley and Upper Weiser River. In
Oregon, Oregon Lower Treasure Valley.
* WHEN...Until 9 PM MDT /8 PM PDT/ this evening.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
&&
$$
LC
URGENT - WEATHER MESSAGE
National Weather Service Salt Lake City UT
1234 PM MDT Fri Aug 21 2026
UTZ101>106-221300-
/O.CON.KSLC.HT.Y.0008.000000T0000Z-260822T1300Z/
Great Salt Lake Desert and Mountains-Tooele and Rush Valleys-
Eastern Box Elder County-Northern Wasatch Front-Salt Lake Valley-
Utah Valley-
Including the following locations - Dugway, Park Valley, Salt
Lake City, Payson, Snowville, Tooele, Ogden, Bountiful, West Jordan,
Provo, Brigham City, Vernon, Wendover, Lehi, Grantsville, and Sandy
1234 PM MDT Fri Aug 21 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 AM MDT SATURDAY...
* WHAT...High temperatures to around 100 degrees expected alongside
overnight low temperatures in the low- to mid-70s.
* WHERE...The Wasatch Front, Great Salt Lake Desert and Mountains,
and Tooele and Rush Valleys.
* WHEN...Until 7 AM MDT Saturday.
* IMPACTS...Hot temperatures may cause heat illness. Warm overnight
temperatures will limit the amount of relief from the hot daytime
temperatures, bringing a period of prolonged heat exposure,
especially for vulnerable populations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
&&
$$
For more information from the National Weather Service visit
https://weather.gov/saltlakecity.
For information on potential travel impacts visit
http://udottraffic.utah.gov
Webber
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
201 AM MDT Fri Aug 21 2026
IDZ051-054>057-075-220400-
/O.CON.KPIH.HT.Y.0007.260821T1800Z-260822T0400Z/
Shoshone/Lava Beds-Lower Snake River Plain-Eastern Magic Valley-
Southern Hills/Albion Mountains-Raft River Region-Wood River
Foothills-
Including the cities of Fort Hall, Hailey, Burley, Albion, Shelley,
Pocatello, Oakley, Bellevue, Carey, Picabo, Almo, Malta, American
Falls, Richfield, Rockland, Heyburn, Rupert, Blackfoot, Holbrook, and
Shoshone
201 AM MDT Fri Aug 21 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 10 PM MDT THIS
EVENING...
* WHAT...Temperatures up to 98 expected.
* WHERE...Wood River Foothills, Eastern Magic Valley, Shoshone/Lava
Beds, Lower Snake River Plain, Raft River Region, and Southern
Hills/Albion Mountains.
* WHEN...From noon today to 10 PM MDT this evening.
* IMPACTS...Hot temperatures may cause heat illnesses, including
heatstroke and heat exhaustion.
$$
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
201 AM MDT Fri Aug 21 2026
IDZ052-053-058-059-220400-
/O.CON.KPIH.HT.Y.0007.260821T1800Z-260822T0400Z/
Arco/Mud Lake Desert-Upper Snake River Plain-Marsh and Arbon
Highlands-Franklin/Eastern Oneida Region-
Including the cities of Thatcher, Preston, Rexburg, Lava Hot
Springs, Idaho Falls, Downey, INL, St. Anthony, Mud Lake, Craters
of the Moon NM, Inkom, Malad, and McCammon
201 AM MDT Fri Aug 21 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 10 PM MDT THIS
EVENING...
* WHAT...Temperatures up to 95 expected.
* WHERE...Arco/Mud Lake Desert, Franklin/Eastern Oneida Region, Marsh
and Arbon Highlands, and Upper Snake River Plain.
* WHEN...From noon today to 10 PM MDT this evening.
* IMPACTS...Hot temperatures may cause heat illnesses, including
heatstroke and heat exhaustion.
$$
Visit weather.gov/pocatello for more information.
Messick
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
201 AM MDT Fri Aug 21 2026
IDZ061-062-064-065-067-220400-
/O.EXA.KPIH.HT.Y.0007.260821T1800Z-260822T0400Z/
Bear Lake Valley-Blackfoot Mountains-Big Hole Mountains-Teton
Valley-Beaverhead - Lemhi Highlands-
Including the cities of Montpelier, Edie School, Soda Springs,
Georgetown, Driggs, Dubois, Bone, Spencer, St. Charles, Ashton,
Small, Grace, Victor, Tetonia, and Henry
201 AM MDT Fri Aug 21 2026
...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 10 PM MDT THIS
EVENING...
* WHAT...Temperatures up to 95 expected.
* WHERE...Beaverhead - Lemhi Highlands, Big Hole Mountains, Teton
Valley, Bear Lake Valley, and Blackfoot Mountains.
* WHEN...From noon today to 10 PM MDT this evening.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
Flood Advisory
Flood Advisory
National Weather Service Elko NV
1234 PM PDT Fri Aug 21 2026
NVC033-212330-
/O.NEW.KLKN.FA.Y.0055.260821T1934Z-260821T2330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
White Pine NV-
1234 PM PDT Fri Aug 21 2026
...FLOOD ADVISORY IN EFFECT UNTIL 430 PM PDT THIS AFTERNOON...
* WHAT...Flooding caused by excessive rainfall is expected.
* WHERE...South Central White Pine County in northeastern Nevada...
* WHEN...Until 430 PM PDT.
* IMPACTS...Minor flooding in low-lying and poor drainage areas.
* ADDITIONAL DETAILS...
- At 1234 PM PDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Between 0.6 and 1.3 inches of rain
have fallen.
- US Highway 6 and 50 near Connors Pass is the most likely place to
experience minor flooding. Additional rainfall amounts of 0.2 to
0.4 inches are expected over the area. This additional rain will
result in minor flooding.
- Some locations that will experience flooding include...
Connors Pass and Majors Place.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3909 11466 3897 11474 3893 11460 3908 11452
$$
86
Wind Advisory
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1248 PM MDT Fri Aug 21 2026
IDZ012-014-220300-
/O.NEW.KBOI.WI.Y.0012.260822T0000Z-260822T0400Z/
/O.CON.KBOI.HT.Y.0007.000000T0000Z-260822T0300Z/
Lower Treasure Valley-Upper Treasure Valley-
Including the cities of Caldwell, Nampa, and Boise
1248 PM MDT Fri Aug 21 2026
...WIND ADVISORY IN EFFECT FROM 6 PM TO 10 PM MDT THIS EVENING...
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING...
* WHAT...For the Heat Advisory, temperatures 98 to 103 degrees. For
the Wind Advisory, south winds 25 to 35 mph with gusts up to 65 mph
expected.
* WHERE...Lower Treasure Valley and Upper Treasure Valley.
* WHEN...For the Heat Advisory, until 9 PM MDT this evening. For the
Wind Advisory, from 6 PM to 10 PM MDT this evening.
* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result. Hot
temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Strong gusts from the south and southwest will
create areas of blowing dust and visibility as low as one mile,
advancing northward through the Snake Basin, with greatest impacts
between 800 PM and 930 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1248 PM MDT Fri Aug 21 2026
IDZ015-029-220300-
/O.NEW.KBOI.WI.Y.0012.260822T0000Z-260822T0400Z/
Southwest Highlands-Owyhee Mountains-
Including the cities of Riddle, Grasmere, Silver City, Reynolds,
Three Creek, and Murphy Hot Springs
1248 PM MDT Fri Aug 21 2026
...WIND ADVISORY IN EFFECT FROM 6 PM TO 10 PM MDT THIS EVENING...
* WHAT...South winds 20 to 30 mph with gusts up to 55 mph expected.
* WHERE...Owyhee Mountains and Southwest Highlands.
* WHEN...From 6 PM to 10 PM MDT this evening.
* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.
* ADDITIONAL DETAILS...Strong gusts from the south and southwest will
create areas of blowing dust and visiibility as low as one mile,
advancing northward through the area, with greatest impacts between
630 PM and 900 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.
&&
$$
