WWA Summary for Heat Advisory Issued by PDT

Heat Advisory

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
1058 PM PDT Thu Aug 20 2026

ORZ041-044-049-050-502-503-505>508-510-511-WAZ024-026>030-521-523-
211400-
/O.CON.KPDT.HT.Y.0006.000000T0000Z-260822T0500Z/
Eastern Columbia River Gorge of Oregon-
Lower Columbia Basin of Oregon-Grande Ronde Valley-Wallowa County-
Northern Blue Mountains of Oregon-
Southern Blue Mountains of Oregon-John Day Basin-Ochoco-
John Day Highlands-
Foothills of the Northern Blue Mountains of Oregon-
Foothills of the Southern Blue Mountains of Oregon-
North Central Oregon-Central Oregon-
Eastern Columbia River Gorge of Washington-Kittitas Valley-
Yakima Valley-Lower Columbia Basin of Washington-
Foothills of the Blue Mountains of Washington-
Northwest Blue Mountains-Simcoe Highlands-
Lower Slopes of the Eastern Washington Cascades Crest-
Including the cities of Arlington, The Dalles, Boardman,
Hermiston, Ione, Cove, Elgin, La Grande, Union, Enterprise,
Joseph, Wallowa, Meacham, Tollgate, Long Creek, North Powder,
Ukiah, Dayville, John Day, Mitchell, Monument, Spray, Brothers,
Paulina, Prairie City, Seneca, Athena, Pendleton, Pilot Rock,
Heppner, Condon, Fossil, Dufur, Maupin, Moro, Bend, Madras,
Prineville, Redmond, White Salmon, Ellensburg, Thorp, Naches,
Sunnyside, Toppenish, Yakima, Connell, Prosser, Tri-Cities,
Dayton, Waitsburg, Walla Walla, Ski Bluewood Resort, Goldendale,
Bickleton, Appleton, Cle Elum, and Cliffdell
1058 PM PDT Thu Aug 20 2026

...HEAT ADVISORY IN EFFECT UNTIL 10 PM PDT FRIDAY...
...HEAT ADVISORY IN EFFECT UNTIL 10 PM PDT FRIDAY...

* WHAT...Hot conditions with afternoon high temperatures of 95
  to 105 degrees expected. This will pose a moderate to major
  risk of heat-related illness.

* WHERE...Portions of central, north central, and northeast
  Oregon and central, south central, and southeast Washington.

* WHEN...Until 10 PM PDT Friday.

* 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.

For sheltering information and other human services in your area,
dial 2 1 1 during business hours or visit 211info.org for Oregon
or wa211.org for Washington anytime.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
222 AM PDT Fri Aug 21 2026

IDZ001>004-026-027-WAZ031>038-041-043-044-047-049-220500-
/O.CON.KOTX.HT.Y.0004.260821T1800Z-260822T0500Z/
Northern Panhandle-Coeur d`Alene Area-Idaho Palouse-Central
Panhandle Mountains-Lewiston Area-Lewis and Southern Nez Perce
Counties-Northeast Blue Mountains-Lower Garfield and Asotin
Counties-Washington Palouse-Moses Lake Area-Upper Columbia Basin-
Spokane Area-Northeast Mountains-Okanogan Highlands-Wenatchee
Area-Okanogan Valley-Waterville Plateau-Central Chelan County-
Western Okanogan County-
Including the cities of Culdesac, Clark Fork, Othello, Ephrata,
Bridgeport, Coulee City, Sandpoint, Genesee, Lewiston, Highway
20 Wauconda Summit, Fernwood, Omak, Methow, Schweitzer Mountain
Road, Sherman Pass, Ritzville, Number 2 Canyon, Plain, Newport,
Post Falls, Wallace, Eastport, Creston, Winchester, Wauconda,
Pangborn Airport, Kamiah, Nezperce, Spokane Valley, Conconully,
Chewelah, Tonasket, Kellogg, Leavenworth, Uniontown, Wilbur,
Mansfield, Quincy, Worley, Soldiers Meadow Road, Gifford, Lookout
Pass, St. Maries, Anatone, Number 1 Canyon, Mullan, Peck, Priest
River, Ione, Deer Park, Flowery Trail Road, Athol, Brewster,
Orin-Rice Road, Fruitland, Davenport, Cloverland Road, Mountain
Road, Winthrop, Badger Mountain Road, La Crosse, Potlatch, Kettle
Falls, Chesaw Road, Clarkston, Cheney, Moses Lake, Fairfield,
Inchelium, Disautel Pass, Loup Loup Pass, Dobson Pass, Nespelem,
Boulder Creek Road, Wenatchee, Northport, Republic, Tekoa,
Bonners Ferry, Lapwai, Metaline Falls, Twisp, Chelan, Harrington,
Osburn, Rosalia, Tiger, Metaline, Pinehurst, Alpowa Summit,
Entiat, Airway Heights, Rockford, Coeur d`Alene, Downtown
Spokane, Plummer, Okanogan, Colfax, Waterville, Peola, Colville,
Craigmont, Oroville, Cashmere, Lewiston Grade, Grand Coulee,
Mazama, Pullman, Oakesdale, Fourth Of July Pass,
Springdale-Hunters Road, Pomeroy, Odessa, Hayden, and Moscow
222 AM PDT Fri Aug 21 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 10 PM
PDT THIS EVENING...

* WHAT...High temperatures ranging from the mid 90s to just over 100
  degrees resulting in Major HeatRisk.

* WHERE...Much of the Inland Northwest.

* WHEN...From 11 AM this morning to 10 PM PDT this evening.

* IMPACTS...Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Low temperatures in the 60s and 70s Friday
  night will provide little overnight relief.

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.

&&

$$

Fewkes

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
216 PM MDT Thu Aug 20 2026

IDZ012-014-016-033-ORZ064-212115-
/O.CON.KBOI.HT.Y.0007.000000T0000Z-260822T0300Z/
Lower Treasure Valley-Upper Treasure Valley-Western Magic Valley-
Upper Weiser River-Oregon Lower Treasure Valley-
Including the cities of Nampa, Boise, Indian Valley, Council,
Glendale, Cambridge, Ontario, Caldwell, Nyssa, Goodrich, Twin Falls,
Fruitvale, and Mesa
216 PM MDT Thu Aug 20 2026 /116 PM PDT Thu Aug 20 2026/

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT /8 PM PDT/
FRIDAY...

* WHAT...High temperatures 98 to 104 degrees both today and Friday.

* WHERE...Portions of south central and southwest Idaho and southeast
  Oregon.

* WHEN...Until 9 PM MDT /8 PM PDT/ Friday.

* 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 Missoula MT
1025 AM MDT Thu Aug 20 2026

IDZ007-008-211630-
/O.NEW.KMSO.HT.Y.0002.260821T1800Z-260822T0300Z/
Orofino/Grangeville Region-Lower Hells Canyon/Salmon River Region-
925 AM PDT Thu Aug 20 2026

...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM PDT FRIDAY...

* WHAT...Moderate to Major risk of heat effects expected.

* WHERE...Lower Hells Canyon/Salmon River Region and Orofino/Lower
  Clearwater Region.

* WHEN...From 11 AM to 8 PM PDT Friday.

* IMPACTS...This level of heat affects anyone without effective
  cooling and/or adequate hydration. Impacts likely in some health
  systems, heat-sensitive industries and infrastructure.

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.

&&

$$