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* WHAT...Dangerously hot conditions with high temperatures of 96-102F and overnight low temperatures of 60-70F expected. * WHERE...Greater Portland/Vancouver Metro, Western and Central Columbia River Gorge, the Corbett area and the Hood River Valley, Central and Southern Willamette Valley, Foothills of the Northern and Central Oregon Cascades, Lower Columbia River and Cowlitz River Valleys, and South Washington Cascade Foothills. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with high temperatures up to 93-98F and overnight low temperatures of 60-68F possible. * WHERE...North and Central Coast Range Mountains of Oregon, and Willapa Hills. * WHEN...Until 5 AM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with high temperatures up to 93-98F and overnight low temperatures of 60-68F possible. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon, North and Central Coast Range Valleys of Oregon, and Willapa and Wahkiakum Lowlands. * WHEN...Until 5 AM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with high temperatures of 96-102F and overnight low temperatures of 60-70F expected. * WHERE...Greater Portland/Vancouver Metro, Western and Central Columbia River Gorge, the Corbett area and the Hood River Valley, Central and Southern Willamette Valley, Foothills of the Northern and Central Oregon Cascades, Lower Columbia River and Cowlitz River Valleys, and South Washington Cascade Foothills. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with high temperatures up to 93-98F and overnight low temperatures of 60-68F possible. * WHERE...North and Central Coast Range Mountains of Oregon, and Willapa Hills. * WHEN...Until 5 AM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with temperatures up to 98 to 104 degrees expected. This will pose a major to locally extreme risk of heat-related illness. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...An alternative scenario is lingering cloud cover from possible thunderstorms from southern Oregon may result in lower than forecast afternoon temperatures or higher than forecast overnight low temperatures.

* WHAT...Hot conditions with temperatures 95 to 100 degrees expected. This will pose a moderate to locally major risk of heat-related illness. * WHERE...In Oregon, Central Oregon, John Day Basin, and Grande Ronde Valley. In Washington, Northwest Blue Mountains. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...An alternative scenario is lingering cloud cover from possible thunderstorms from southern Oregon may result in lower than forecast afternoon temperatures or higher than forecast overnight low temperatures.

* WHAT...Dangerously hot conditions with temperatures up to 98 to 104 degrees expected. This will pose a major to locally extreme risk of heat-related illness. * WHERE...Portions of north central and northeast Oregon and central, south central, and southeast Washington. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...An alternative scenario is lingering cloud cover from possible thunderstorms from southern Oregon may result in lower than forecast afternoon temperatures or higher than forecast overnight low temperatures.

* WHAT...Hot conditions with temperatures 95 to 100 degrees expected. This will pose a moderate to locally major risk of heat-related illness. * WHERE...In Oregon, Central Oregon, John Day Basin, and Grande Ronde Valley. In Washington, Northwest Blue Mountains. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...An alternative scenario is lingering cloud cover from possible thunderstorms from southern Oregon may result in lower than forecast afternoon temperatures or higher than forecast overnight low temperatures.

* WHAT...Hot conditions with temperatures up to 95 degrees expected. This will pose a moderate risk of heat-related illness. * WHERE...East Slopes of the Oregon Cascades and Wallowa County. * WHEN...Until 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...An alternative scenario is lingering cloud cover from possible thunderstorms from southern Oregon may result in lower than forecast afternoon temperatures or higher than forecast overnight low temperatures.

* WHAT...Hot conditions with high temperatures of 95 to 100 degrees expected. Overnight low temperatures of 50 to 65 degrees. * WHERE...In Oregon, all areas from the Cascades and Siskiyou Mountains eastward, including Union Creek, Lake of the Woods, Fish Lake, Howard Prairie, Klamath Falls, Chiloquin, Crescent, Fort Rock, Bly and Lakeview. In California, eastern Siskiyou County and all of Modoc County, including Dorris, Macdoel, Tulelake, Adin, Alturas and Likely. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat related illnesses.

* WHAT...Very hot conditions with high temperatures of 100 to 107 degrees expected. Overnight low temperatures of 60 to 70 degrees. * WHERE...The valleys of Josephine and Jackson Counties. This includes Agness, Grants Pass, Cave Junction, Williams, Ruch, Rogue River, Gold Hill, White City, Shady Cove, Medford, Jacksonville, Talent and Ashland. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Unusually hot temperatures will increase risk for heat related illnesses. Warm overnight temperatures will provide little relief from hot daytime temperatures.

* WHAT...Hot conditions with high temperatures of 95 to 104 degrees expected. Overnight low temperatures of 55 to 65 degrees. * WHERE...The valleys of central and eastern Douglas County. This includes Camas Valley, Elkton, Drain, Sutherlin, Roseburg, Glendale, Riddle, Canyonville, Tiller and Toketee Falls. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat related illnesses.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 1 PM to 9 PM PDT Sunday. * IMPACTS...Abundant lightning on dry fuels resulting in the potential for numerous new fire starts. * AFFECTED AREA...In California, all of Fire weather zones 280, 281, 284, and 285, and in Oregon, all of Fire weather zones 621, 623, 624, and 625. * THUNDERSTORMS...Scattered thunderstorms with abundant lightning are expected. Storms are likely to be wet, but lightning strikes outside of precipitation cores are possible, and may cause many new fire starts. * OUTFLOW WINDS...Gusts of 35 to 50 mph could travel outward up to 25 miles from thunderstorm cores. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* 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 90 to 100 degrees. * STABILITY...Unstable conditions can be expected. * 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.

* AFFECTED AREA...Fire Weather Zone 661 East Portion of the Olympic Mountains. * RELATIVE HUMIDITY...As low as 20 to 25 percent. * TEMPERATURES...Up to 90 to 95. * STABILITY...Unstable conditions can be expected. * 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.

* 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 90 to 100 degrees. * STABILITY...Unstable conditions can be expected. * 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...Hot conditions with high temperatures ranging from the upper 80s to upper 90s and low temperatures mostly in the 60s. This will pose a major risk of heat-related illness. * WHERE...Foothills and Valleys of the North Cascades, Foothills and Valleys of Central King County, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Snohomish and Northern King Counties, and Foothills and Valleys of Thurston and Lewis Counties. * WHEN...Until 5 AM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* WHAT...Hot conditions with high temperatures ranging from the mid 80s to 90s expected and low temperatures mostly in the 60s. This will pose a moderate risk of heat-related illness. * WHERE...Portions of northwest and west central Washington. * WHEN...Until 5 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.

* WHAT...Hot conditions with high temperatures ranging from the mid 80s to 90s expected and low temperatures mostly in the 60s. This will pose a moderate risk of heat-related illness. * WHERE...Lake Crescent Area Including US 101. * WHEN...Until 5 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.