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* WHAT...Dangerously hot conditions with high temperatures of 100 to 115 and low temperatures in the upper 60s expected over multiple days. Overnight low temperatures will remain in the mid to upper 60s. * WHERE...In California, western and central Siskiyou County. This includes the cities of Yreka, Weed, Etna, and Happy Camp, Mt Shasta City, and Dunsmuir. In Oregon, Josephine and Jackson counties and eastern Curry County. This includes the entire Rogue Valley and the cities of Medford, Grants Pass, Cave Junction, and Butte Falls. * WHEN...Until 9 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a multi day heat wave with the warmest temperatures on Friday and Saturday. The Medford Airport has a 40% chance to tie or exceed the all time temperature record of 115.

* WHAT...Dangerously hot conditions during the day with little relief overnight. Highs will be in the 90s to 100s. Overnight lows will be in 60s to low 70s. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...From noon Saturday to 10 PM PDT Friday, July 12. * IMPACTS...Heat related illnesses increase significantly during extreme heat.

* WHAT...Dangerously hot conditions during the day for the valleys. Highs will be in the 90s. Overnight lows will be in 50s to low 60s. * WHERE...Stehekin, Holden Village, and Stevens Pass. * WHEN...From noon Saturday to 10 PM PDT Friday, July 12. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Dangerously hot conditions during the day for the valleys. Highs will be in the 90s. Overnight lows will be in 50s to low 60s. * WHERE...Fruitland, Sandpoint, Newport, Sherman Pass, St. Maries, Priest River, Boulder Creek Road, Highway 20 Wauconda Summit, Springdale-Hunters Road, Inchelium, Lookout Pass, Dobson Pass, Fourth Of July Pass, Flowery Trail Road, Wauconda, Wallace, Mullan, Eastport, Osburn, Kellogg, Metaline Falls, Deer Park, Clark Fork, Fernwood, Northport, Kettle Falls, Chewelah, Ione, Metaline, Republic, Schweitzer Mountain Road, Tiger, Athol, Pinehurst, Chesaw Road, Bonners Ferry, Orin-Rice Road, and Colville. * WHEN...From noon Sunday to 10 PM PDT Friday, July 12. * IMPACTS...Hot temperatures may cause heat illnesses.

...DRY AND LOCALLY BREEZY FRIDAY AND SATURDAY... .Breezy winds will develop Friday afternoon and evening through the Kittitas Valley and be coincident with low relative humidities. Saturday, locally breezy winds and critically low relative humidities are anticipated across central Oregon. * AFFECTED AREA...Fire Weather Zone 690 Kittitas Valley. * WINDS...West 15-20 mph with gusts of 20-35 mph. * RELATIVE HUMIDITY...As low as 10-15 percent. * IMPACTS...Breezy conditions combined with low relative humidity will promote conditions conducive to rapid fire spread and extreme fire behavior.

...DRY AND LOCALLY BREEZY FRIDAY AND SATURDAY... .Breezy winds will develop Friday afternoon and evening through the Kittitas Valley and be coincident with low relative humidities. Saturday, locally breezy winds and critically low relative humidities are anticipated across central Oregon. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Saturday afternoon through Saturday evening. * AFFECTED AREA...Fire Weather Zones 610 East Slopes of Central Oregon Cascades, 611 Deschutes National Forest -minus Sisters Ranger District and 640 Central Mountains of Oregon. * WINDS...Northwest 10-15 mph with gusts of 15-25 mph. * RELATIVE HUMIDITY...As low as 5-10 percent. * IMPACTS...Locally breezy conditions combined with very low relative humidity will promote conditions conducive to rapid fire spread and extreme fire behavior.

* WHAT...Afternoon temperatures in the upper 80s to middle 90s expected. A few spots could reach close to 100 deg, mainly those lower valleys located towards the Willamette Valley. * WHERE...In Oregon, North Oregon Cascades, Cascades of Lane County, and Cascades of Marion and Linn Counties. In Washington, South Washington Cascades. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Dangerously hot conditions with temperatures 100 to 105 expected. Overnight temperatures will also be very warm and limit chances to recover from the heat, with lows ranging from the mid 60s to low 70s. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* WHAT...Afternoon temperatures in the upper 80s to middle 90s expected. A few spots could reach close to 100 deg, mainly those lower valleys located towards the Willamette Valley. * WHERE...In Oregon, North Oregon Cascades, Cascades of Lane County, and Cascades of Marion and Linn Counties. In Washington, South Washington Cascades. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Dangerously hot conditions with temperatures 100 to 105 expected. Overnight temperatures will also be very warm and limit chances to recover from the heat, with lows ranging from the mid 60s to low 70s. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* WHAT...Dangerously hot conditions with maximum temperatures 100-104 Saturday, increasing to 105-110 by Wednesday. * WHERE...Portions of southwest Idaho and northeast and southeast Oregon. * WHEN...From Saturday afternoon through Wednesday afternoon. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Multiple daily max temperature records are being threatened by this heatwave. The longevity of the event makes this a particularly dangerous heat wave.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees. Morning low temperatures in the mid-50s to mid-60s. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...From noon Friday to 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Moderate to Major HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

* WHAT...Dangerously hot conditions with little overnight relief. Afternoon high temperatures of 95 to 110 degrees. Morning low temperatures in the lower 60s to lower 70s. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...From noon Friday to 10 PM PDT Thursday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major to locally Extreme HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

* WHAT...Hot temperatures with modest overnight relief. Afternoon temperatures of 95 to 110 degrees. Morning low temperatures in the mid-50s to upper 60s. * WHERE...Central Oregon and John Day Basin. * WHEN...From noon Friday to 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Moderate to Major HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 95 to 110 degrees. Morning low temperatures in the mid-50s to lower 70s. * WHERE...Wallowa County. * WHEN...From noon Monday to 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hottest temperatures will be in the canyons of Wallowa County, especially Hells Canyon. Temperatures will be comparatively cooler in Wallowa Valley. Moderate to locally Extreme HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

* WHAT...Dangerously hot conditions with little overnight relief. Afternoon high temperatures of 95 to 110 degrees. Morning low temperatures in the lower 60s to lower 70s. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...From noon Friday to 10 PM PDT Thursday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major to locally Extreme HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

* WHAT...High temperatures of 95 to 100 degrees with lows in the upper 50's expected over multiple days. * WHERE...In California, Modoc County and northeast Siskiyou County. This includes the cities of Macdoel and Alturas. In Oregon, Lake County and eastern Klamath County. This includes the cities of Klamath Falls, Chemult, Summer Lake, and Lakeview * WHEN...Until 9 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a long-duration heatwave with temperatures lingering through at least Monday.

* WHAT...High temperatures between 105 to 110 with low temperatures in the mid to upper 60's expected over multiple days. * WHERE...Central Douglas County and Eastern Douglas County Foothills. This includes the cities of Roseburg, Toketee Falls, Sutherlin. * WHEN...Until 9 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a multi day heat wave with the warmest temperatures on Friday and Saturday.

* WHAT...Dangerously hot conditions with high temperatures of 110 to 115 and low temperatures in the upper 60s expected over multiple days. * WHERE...In California, western and central Siskiyou County. This includes the cities of Yreka, Weed, Etna, and Happy Camp. In Oregon, Josephine and Jackson counties and eastern Curry County. This includes the entire Rogue Valley and the cities of Medford, Grants Pass, Cave Junction, and Butte Falls. * WHEN...Until 9 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a multi day heat wave with the warmest temperatures on Friday and Saturday. The Medford Airport has a 47% chance to tie or exceed the all time temperature record of 115.

* WHAT...After very warm overnight lows this morning in the 70s. Temperatures of 95 to 100 degrees are expected. * WHERE...Portions of the Curry County Coast from Brookings to Pistol River and the Chetco basin. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...The thermal trough will begin to move inland later today and temperatures will decrease somewhat and become more reasonable Friday into the Weekend at the coast.