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The National Weather Service in Seattle has issued a Red Flag Warning for hot, dry and unstable conditions, which is in effect from 11 AM Saturday to 11 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * 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 25 percent. * TEMPERATURES...Up to 85 to 95 degrees Fahrenheit. * 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.

* 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 Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat 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...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.

* 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 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 Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Area rivers will be cold and can cause shock to swimmers.

* 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...Until 10 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity 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 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...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures and high humidity 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 and high humidity 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...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...Until 10 PM PDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Major 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...Until 10 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Major to locally Extreme HeatRisk (risk of heat-related impacts) is anticipated through the duration of the event.

...DRY AND LOCALLY BREEZY FRIDAY AND SATURDAY... .Breezy winds will develop Friday afternoon and evening through the Kittitas Valley and will 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 10 to 20 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 13 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 will 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 Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM to 9 PM PDT Saturday. * AFFECTED AREA...Fire Weather Zone 642 Southern Blue and Strawberry Mountains. * WINDS...Northwest 10 to 15 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 7 percent. * IMPACTS...

...DRY AND LOCALLY BREEZY FRIDAY AND SATURDAY... .Breezy winds will develop Friday afternoon and evening through the Kittitas Valley and will 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 Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM to 9 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * 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 to 15 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 7 percent. * IMPACTS...Locally breezy conditions combined with very low relative humidity will promote conditions conducive to rapid fire spread and extreme fire behavior.

* WHAT...Dangerously hot conditions with temperatures 100 to 105 expected. Overnight temperatures will also be very warm, only falling below 70 degrees for a short period late each night, if at all. The warm nighttime temperatures will limit chances to recover from the heat, exacerbating the risk of heat-related illness in this prolonged heat wave. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...Until 10 PM PDT Tuesday. * 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 degrees, 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 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Dangerously hot conditions with temperatures 100 to 105 expected. Overnight temperatures will also be very warm, only falling below 70 degrees for a short period late each night, if at all. The warm nighttime temperatures will limit chances to recover from the heat, exacerbating the risk of heat-related illness in this prolonged heat wave. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...Until 10 PM PDT Tuesday. * 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 degrees, 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 10 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...For the Heat Advisory, temperatures up to 99 expected. For the Excessive Heat Watch, dangerously hot conditions with temperatures up to 102 possible. * WHERE...Harney County, Malheur County and Oregon Lower Treasure Valley. * WHEN...For the Heat Advisory, from noon MDT /11 AM PDT/ Saturday to noon MDT /11 AM PDT/ Monday. For the Excessive Heat Watch, from Monday afternoon through Friday evening. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Temperatures will increase even more starting Monday. Multiple daily max temperature records are being threatened by this heatwave. The longevity of the event makes this a particularly dangerous heat wave.

* WHAT...Dangerously hot conditions with temperatures up to 111 possible. * WHERE...In Idaho, Lower Treasure Valley ID and Owyhee Mountains. In Oregon, Baker County. * WHEN...From Monday afternoon through Friday evening. * 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...For the Heat Advisory, temperatures up to 99 expected. For the Excessive Heat Watch, dangerously hot conditions with temperatures up to 102 possible. * WHERE...Harney County, Malheur County and Oregon Lower Treasure Valley. * WHEN...For the Heat Advisory, from noon MDT /11 AM PDT/ Saturday to noon MDT /11 AM PDT/ Monday. For the Excessive Heat Watch, from Monday afternoon through Friday evening. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Temperatures will increase even more starting Monday. Multiple daily max temperature records are being threatened by this heatwave. The longevity of the event makes this a particularly dangerous heat wave.

...RED FLAG WARNING IN EFFECT FOR WESTERN TWIN FALLS BLM SATURDAY AFTERNOON AND EVENING. FIRE WEATHER WATCH IN EFFECT FOR BURNS AND VALE BLM SATURDAY AFTERNOON AND EVENING... .Red Flag Warning replaces Fire Weather Watch for the Western Twin Falls BLM for wind and low humidity, from 3 PM MDT Saturday afternoon through 9 PM MDT Saturday evening. Fire Weather Watch for Vale BLM and Burns BLM for wind and low humidity, from 3 PM MDT (2PM PDT) Saturday afternoon through 9 PM MDT (8 PM PDT) Saturday evening. The National Weather Service in Boise has issued a Fire Weather Watch for gusty winds and low relative humidities, which is in effect from Saturday afternoon through Saturday evening. * Affected Area...In Oregon, Fire Weather Zones 636 Burns BLM and 637 Vale BLM. * Timing...From Saturday afternoon through Saturday evening. * Winds...Northwest 15 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 5 percent. * Temperatures...Up to 99.