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* WHAT...Dangerously hot conditions with limited overnight relief. Afternoon high temperatures of 95 to 110 degrees. Overnight low temperatures in the 60s to mid-70s. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

* WHAT...Dangerously hot conditions with limited overnight relief. Afternoon high temperatures of 95 to 105 degrees. Overnight low temperatures in the mid-50s to lower 70s. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees, highest in lower valleys and canyons. Overnight low temperatures in the mid 50s to upper 60s, lowest in high valleys. * WHERE...Blue Mountains of Oregon and Washington, Grande Ronde Valley, and Wallowa County. * WHEN...From noon today to 10 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday and Wednesday.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees, highest along the East Slopes of the Oregon Cascades. Overnight low temperatures in the low 50s to upper 60s, lowest in valleys. * WHERE...In Oregon, East Slopes of the Oregon Cascades. In Washington, Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...From noon today to 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

* WHAT...Dangerously hot conditions with limited overnight relief. Afternoon high temperatures of 95 to 110 degrees. Overnight low temperatures in the 60s to mid-70s. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

* WHAT...Dangerously hot conditions with limited overnight relief. Afternoon high temperatures of 95 to 110 degrees. Overnight low temperatures in the mid-50s to lower 70s. * WHERE...Central Oregon and John Day Basin. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees, highest in lower valleys and canyons. Overnight low temperatures in the mid 50s to upper 60s, lowest in high valleys. * WHERE...Blue Mountains of Oregon and Washington, Grande Ronde Valley, and Wallowa County. * WHEN...From noon today to 10 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday and Wednesday.

* WHAT...Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees, highest along the East Slopes of the Oregon Cascades. Overnight low temperatures in the low 50s to upper 60s, lowest in valleys. * WHERE...In Oregon, East Slopes of the Oregon Cascades. In Washington, Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...From noon today to 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Tuesday.

...HOT, DRY, UNSTABLE CONDITIONS ALONG THE EAST SLOPES OF THE CASCADES MONDAY AND TUESDAY... ...FIRE WEATHER WATCH FOR WIND AND LOW HUMIDITY WEDNESDAY AFTERNOON AND EVENING IN CENTRAL WASHINGTON... ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE EAST SLOPES OF THE CENTRAL AND NORTHERN CASCADES (FIRE WEATHER ZONES 696, 697)... The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * Affected Area: Fire Weather Zone 696 East Washington Central Cascades (Zone 696) and Fire Weather Zone 697 East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697). * Winds: Monday-Tuesday: 4-10 mph. A weak push of northwest winds Tuesday evening 10-15 mph. On Wednesday: west to northwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidities: Monday-Tuesday: 8 to 14 percent in the valleys and 14 to 23 percent over the higher terrain. Wednesday: 10 to 15 percent in the valleys and 15 to 25 percent in the higher terrain. Poor overnight humidity recovery. * Temperatures: High temperatures 100 to 108 in the valleys, 80s and 90s in the mountains. * Impacts: hot, dry, and unstable conditions Monday and Tuesday then wind on Wednesday will lead to the potential for rapid fire growth on any new or existing fires.

...HOT, DRY, UNSTABLE CONDITIONS ALONG THE EAST SLOPES OF THE CASCADES MONDAY AND TUESDAY... ...FIRE WEATHER WATCH FOR WIND AND LOW HUMIDITY WEDNESDAY AFTERNOON AND EVENING IN CENTRAL WASHINGTON... The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * Affected Area: Fire Weather Zone 703 Okanogan Valley (Zone 703), Fire Weather Zone 704 Methow Valley (Zone 704), Fire Weather Zone 705 Foothills of Central Washington Cascades (Zone 705), Fire Weather Zone 706 Waterville Plateau (Zone 706) and Fire Weather Zone 707 Western Columbia Basin (Zone 707). * Winds: West 13 to 20 mph with gusts up to 35 mph. In the Okanogan Valley, winds starting off south 10 to 18 mph and shifting to west 10 to 20 mph. * Relative Humidities: 8 to 15 percent. * Impacts: Any new or existing fires will have the potential to spread rapidly.

...HOT, DRY, UNSTABLE CONDITIONS ALONG THE EAST SLOPES OF THE CASCADES MONDAY AND TUESDAY... ...FIRE WEATHER WATCH FOR WIND AND LOW HUMIDITY WEDNESDAY AFTERNOON AND EVENING IN CENTRAL WASHINGTON... * Affected Area: Fire Weather Zone 698 East Washington North Cascades (Zone 698). * Relative Humidities: Minimum values 10 to 16 percent in the valleys and 14 to 23 percent over the higher terrain. Poor overnight humidity recovery. * Temperatures: High temperatures 97 to 104 in the valleys, 80s and 90s in the mountains. * Impacts: Hot, dry, and unstable conditions will lead to the potential for rapid fire growth on any new or existing fires.

...HOT, DRY, UNSTABLE CONDITIONS ALONG THE EAST SLOPES OF THE CASCADES MONDAY AND TUESDAY... ...FIRE WEATHER WATCH FOR WIND AND LOW HUMIDITY WEDNESDAY AFTERNOON AND EVENING IN CENTRAL WASHINGTON... ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE EAST SLOPES OF THE CENTRAL AND NORTHERN CASCADES (FIRE WEATHER ZONES 696, 697)... The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * Affected Area: Fire Weather Zone 696 East Washington Central Cascades (Zone 696) and Fire Weather Zone 697 East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697). * Winds: Monday-Tuesday: 4-10 mph. A weak push of northwest winds Tuesday evening 10-15 mph. On Wednesday: west to northwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidities: Monday-Tuesday: 8 to 14 percent in the valleys and 14 to 23 percent over the higher terrain. Wednesday: 10 to 15 percent in the valleys and 15 to 25 percent in the higher terrain. Poor overnight humidity recovery. * Temperatures: High temperatures 100 to 108 in the valleys, 80s and 90s in the mountains. * Impacts: hot, dry, and unstable conditions Monday and Tuesday then wind on Wednesday will lead to the potential for rapid fire growth on any new or existing fires.

...DRY AND BREEZY CONDITIONS WEDNESDAY... .Breezy winds will develop through the Cascade gaps and into portions of the Columbia Basin Wednesday and will coincide with low relative humidities in the afternoon and evening. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Breezy conditions combined with low RHs will result in rapid fire spread and extreme fire behavior.

...DRY AND BREEZY CONDITIONS WEDNESDAY... .Breezy winds will develop through the Cascade gaps and into portions of the Columbia Basin Wednesday and will coincide with low relative humidities in the afternoon and evening. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Breezy conditions combined with low RHs will result in rapid fire spread and extreme fire behavior.

* WHAT...High temperatures of 100 to 110 with low temperatures in the mid to upper 60s expected. * WHERE...Central Douglas County and Eastern Douglas County Foothills. This includes the cities of Roseburg, Toketee Falls, and Sutherlin. * WHEN...Until 9 PM PDT Tuesday. * 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.

* WHAT...High temperatures of 95 to 102 degrees with lows in the mid to upper 50s expected. * WHERE...In California, Modoc County and eastern Siskiyou County. This includes the cities and communities of Macdoel, Tulelake, Pondosa, Bray, Tennant, Dorris, Tionesta, Alturas, and Adin. In Oregon, Klamath and Lake counties. This includes the cities of Klamath Falls, Chemult, Summer Lake, Chiloquin, Malin, Keno, Sprague River, and Lakeview. * WHEN...Until 9 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses. Area rivers will be cold and can cause shock to swimmers.

* WHAT...Dangerously hot conditions with high temperatures 105 to 115, and low temperatures in the mid 60s to lower 70s. * WHERE...In California, western and central Siskiyou County. This includes the cities of Yreka, Weed, Etna, 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 Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Area rivers will be cold and can cause shock to swimmers.

* WHAT...Hot conditions with afternoon temperatures up to 100 degrees and overnight lows in the 60s. This will pose a moderate to major risk of heat-related illness. * WHERE...Portions of northwest and west central Washington. * WHEN...Until 10 PM PDT Tuesday. * IMPACTS...Extreme heat will significantly increase the risk of heat-related illnesses for much of the population, especially those who are heat sensitive and those without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Temperatures will gradually cool during the middle and late portions of the week, but will remain well above normal in the 80s for much of the lowlands.

* WHAT...Hot conditions with temperatures away from the immediate coastline in the 80s degrees. This will pose a moderate risk of heat-related illness. * WHERE...Central Coast, North Coast, and Western Strait of Juan De Fuca. * WHEN...Until 11 AM PDT Tuesday. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Temperatures along the immediate coast will be cooler, but this will not extend very far inland during the daytime hours through Monday. Some relief is possible during the overnight hours, but will be gradual and somewhat brief. Stronger onshore flow will bring a return to closer to normal temperatures for the coastal areas by midweek.

* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 15 to 20 percent with moderate to poor overnight recovery. * TEMPERATURES...High temperatures 85 to 95 degrees with overnight lows in the 60s. * MID-LEVEL HAINES...6 * IMPACTS...A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area.