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* WHAT...Dangerously hot conditions with temperatures around 100 expected. Overnight lows in the upper 50s to near 70, warmest in urban areas, Columbia River Gorge, and Cascade foothills and valleys. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 90 to 95.

* WHAT...Dangerously hot temperatures in the mid to upper 90s expected. Overnight lows in the mid 50s to near 70. * WHERE...In Oregon, North Oregon Coast Range, North Oregon Coast Range Lowlands, Upper Hood River Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, South Washington Cascade Foothills. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 85 to 90.

* WHAT...Dangerously hot conditions with temperatures around 100 expected. Overnight lows in the upper 50s to near 70, warmest in urban areas, Columbia River Gorge, and Cascade foothills and valleys. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 90 to 95.

* WHAT...Temperatures 94 to 97 expected. Overnight lows in the mid 50s to mid 60s. * WHERE...In Oregon, North Oregon Coast Range, North Oregon Coast Range Lowlands, Upper Hood River Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, South Washington Cascade Foothills. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 85 to 90.

* WHAT...Dangerously hot conditions with temperatures around 100 expected. Overnight lows in the upper 50s to near 70, warmest in urban areas, Columbia River Gorge, and Cascade foothills and valleys. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 90 to 95.

* WHAT...Dangerously hot temperatures in the mid to upper 90s expected. Overnight lows in the mid 50s to near 70. * WHERE...In Oregon, North Oregon Coast Range, North Oregon Coast Range Lowlands, Upper Hood River Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, South Washington Cascade Foothills. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 85 to 90.

* WHAT...Dangerously hot conditions with temperatures around 100 expected. Overnight lows in the upper 50s to near 70, warmest in urban areas, Columbia River Gorge, and Cascade foothills and valleys. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 90 to 95.

* WHAT...Hot conditions with temperatures up into the mid 90s to low 100s expected. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...From 1 PM Thursday to 9 PM PDT Saturday. * 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 temperatures of 90-98 in the lower elevations and 80-90 in the mountains. This will pose a moderate to major risk of heat-related illness. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...From 1 PM Thursday to 9 PM PDT Saturday. * 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 temperatures of 95-105 in the lower elevations and 85-95 in the mountains. This will pose a moderate to major risk of heat-related illness. * WHERE...Portions of central, north central, and northeast Oregon and central, south central, and southeast Washington. * WHEN...From 1 PM Thursday to 9 PM PDT Saturday. * 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 temperatures of 95-105 in the lower elevations and 85-95 in the mountains. This will pose a moderate to major risk of heat-related illness. * WHERE...Portions of central, north central, and northeast Oregon and central, south central, and southeast Washington. * WHEN...From 1 PM Thursday to 9 PM PDT Saturday. * 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 temperatures 85-95 degrees expected. This will pose a moderate to major risk of heat-related illness. * WHERE...Ochoco-John Day Highlands and Southern Blue Mountains of Oregon. * WHEN...From 1 PM to 8 PM PDT Friday. * 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.

The National Weather Service in Seattle has issued a Fire Weather Watch for hot, dry and unstable conditions, and periods of breezy winds early Thursday morning, which is in effect from Wednesday evening through Friday evening. * 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. * TEMPERATURES...Up to 85. * HAINES...Mid-level Haines 6. * WINDS...East to southeast winds 5 to 10 mph early Thursday morning. * IMPACTS...A combination of a moderate breeze overnight into the early morning hours on Thursday, as well as low relative humidity, and warm temperatures can contribute to rapid rates of spread and down-wind spotting on existing fires. If a fire were to begin, air quality may diminish in the surrounding area. 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.

The National Weather Service in Seattle has issued a Fire Weather Watch for hot, dry and unstable conditions, which is in effect from Wednesday evening through Thursday evening. * AFFECTED AREA...Fire Weather Zone 652 West Portion of the Olympic Mountains and Fire Weather Zone 661 East Portion of the Olympic Mountains. * RELATIVE HUMIDITY...As low as 25 percent. * TEMPERATURES...Up to 84. * HAINES...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...Hot conditions with temperatures in the mid 80s to mid 90s expected. This will pose a moderate risk of heat-related illness. * WHERE...Portions of northwest and west central Washington. * WHEN...From 8 AM Thursday to 11 PM PDT Friday. * 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 temperatures in the 80s to low 90s expected. This will pose a moderate risk of heat-related illness. * WHERE...Central Coast, Eastern Strait of Juan de Fuca, North Coast, Western Skagit County, Western Strait of Juan De Fuca, and Western Whatcom County. * WHEN...From 8 AM to 11 PM PDT Thursday. * 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.

The National Weather Service in Portland has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday evening through Thursday evening. * AFFECTED AREA...In Washington, Fire Weather Zone 636 Western Columbia River Gorge in Oregon and Washington. * WINDS...East 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...20 to 30 percent. * IMPACTS...Conditions may be favorable for rapid fire spread which may threaten life and property. Use extra caution with potential ignition sources, especially in grassy areas. Outdoor burning is not recommended.

* WHAT...Heat index values up to 100 expected. * WHERE...In California, Western Siskiyou County. In Oregon, Central Douglas County, Eastern Curry County and Josephine County, Jackson County, and South Central Oregon Coast. * WHEN...From noon to 8 PM PDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* WHAT...Dangerously hot conditions with temperatures around 100 expected. Overnight lows in the upper 50s to near 70, warmest in urban areas, Columbia River Gorge, and Cascade foothills and valleys. * WHERE...Portions of northwest and west central Oregon and southwest Washington. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 90 to 95.

* WHAT...Temperatures 94 to 97 expected. Overnight lows in the mid 50s to mid 60s. * WHERE...In Oregon, North Oregon Coast Range, North Oregon Coast Range Lowlands, Upper Hood River Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, South Washington Cascade Foothills. * WHEN...From noon Thursday to 10 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Conditions begin to warm on Wednesday with highs of 85 to 90.