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* 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. This will pose a major risk of heat-related illness. * 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 Today.

* 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. This will pose a moderate risk of heat-related illness. * WHERE...Blue Mountains of Oregon and Washington, Grande Ronde Valley, and Wallowa County. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Today 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. This will pose a moderate risk of heat-related illness. * WHERE...In Oregon, East Slopes of the Oregon Cascades. In Washington, Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Today.

* 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. This will pose a major risk of heat-related illness. * 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 Today.

* 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. This will pose a major risk of heat-related illness. * 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 Today.

* 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. This will pose a moderate risk of heat-related illness. * WHERE...Blue Mountains of Oregon and Washington, Grande Ronde Valley, and Wallowa County. * WHEN...Until 10 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Today 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. This will pose a moderate risk of heat-related illness. * WHERE...In Oregon, East Slopes of the Oregon Cascades. In Washington, Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat-related illnesses. * ADDITIONAL DETAILS...Hottest temperatures during this long-duration heatwave are expected Today.

* 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 percent. * TEMPERATURES...Highs in the mid 80s to mid 90s. * 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.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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 Red Flag Warning for dry and unstable conditions, which is in effect from noon today to 11 PM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains, 643 Northern Blue Mountains of Oregon, 644 Central Blue Mountains, 645 Wallowa District, 692 Blue Mountains of Washington and 693 Southeast Washington Grande Ronde Valley. * TIMING...Tuesday afternoon through Wednesday evening. * WINDS...North 5 to 15 mph. * RELATIVE HUMIDITY...As low as 7 percent. * TEMPERATURES...Up to 101. * IMPACTS...There is a chance of extreme fire behavior for any new and existing fires. * HAINES...As high as 6.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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. * 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.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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. * AFFECTED AREA...Fire Weather Zones 610 East Slopes of Central Oregon Cascades, 611 Deschutes National Forest -minus Sisters Ranger District, 639 East Slopes of the Northern Oregon Cascades, 640 Central Mountains of Oregon, 694 Yakama Alpine District and 695 East Washington South Central Cascade Mountains. * TIMING...Today through Tuesday night. * WINDS...North 10 to 15 mph. * RELATIVE HUMIDITY...As low as 8 percent. * TEMPERATURES...Up to 106. * IMPACTS...Any new and existing fires have a strong potential for extreme fire behavior. * HAINES...As high as 6.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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 Red Flag Warning for dry and unstable conditions, which is in effect from noon today to 11 PM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains, 643 Northern Blue Mountains of Oregon, 644 Central Blue Mountains, 645 Wallowa District, 692 Blue Mountains of Washington and 693 Southeast Washington Grande Ronde Valley. * TIMING...Tuesday afternoon through Wednesday evening. * WINDS...North 5 to 15 mph. * RELATIVE HUMIDITY...As low as 7 percent. * TEMPERATURES...Up to 101. * IMPACTS...There is a chance of extreme fire behavior for any new and existing fires. * HAINES...As high as 6.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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. * 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.

...HOT, DRY AND UNSTABLE ALONG WITH BREEZY WINDS TUESDAY THROUGH LATE WEDNESDAY... .High pressure that has brought the hot temperatures the past weekend is showing signs of breaking down. The instability will increase as a result, and the combination of hot, dry and unstable weather warrants Red Flag Warnings. In addition, 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. * AFFECTED AREA...Fire Weather Zones 610 East Slopes of Central Oregon Cascades, 611 Deschutes National Forest -minus Sisters Ranger District, 639 East Slopes of the Northern Oregon Cascades, 640 Central Mountains of Oregon, 694 Yakama Alpine District and 695 East Washington South Central Cascade Mountains. * TIMING...Today through Tuesday night. * WINDS...North 10 to 15 mph. * RELATIVE HUMIDITY...As low as 8 percent. * TEMPERATURES...Up to 106. * IMPACTS...Any new and existing fires have a strong potential for extreme fire behavior. * HAINES...As high as 6.

* WHAT...Hot conditions with high temperatures in the mid to upper 90s and low temperatures in the lower to mid 60s. This will pose a moderate to major risk of heat-related illness. * WHERE...Hood Canal Area, Bellevue and Vicinity, Bremerton and Vicinity, East Puget Sound Lowlands, Everett and Vicinity, Seattle and Vicinity, Tacoma Area, West Slopes North Cascades and Passes, West Slopes North Central Cascades and Passes, and West Slopes South Central Cascades and Passes. * WHEN...Until 5 PM PDT Wednesday. * IMPACTS...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.

* WHAT...Hot conditions with high temperatures mostly in the 90s and low temperatures in the 60s. This will pose a moderate to major risk of heat-related illness. * WHERE...Admiralty Inlet Area, Eastern Strait of Juan de Fuca, Olympics, San Juan County, Western Skagit County, Western Whatcom County, Lower Chehalis Valley Area, and Southwest Interior. * WHEN...Until 10 PM PDT this evening. * IMPACTS...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.

* WHAT...Hot conditions with high temperatures away from the immediate coastline in the 80s. 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 this morning. * 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.

* 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 Wednesday. * 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 112 degrees, and low temperatures in the mid 60s to lower 70s through Tuesday, then continuing hot with high temperatures 100 to 110 on Wednesday. * 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 Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Area rivers will be cold and can cause shock to swimmers.

* WHAT...High temperatures of 100 to 108 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 this evening. * 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.