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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...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.

* 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...High temperatures of 100 to 105 will be around 20 degrees above normal. * WHERE...In California, Western Siskiyou County. In Oregon, Central Douglas County, Eastern Curry County and Josephine County, Jackson County, and South Central Oregon Coast. This includes the lower Klamath, Rogue, Illinois, Umpqua, upper Coquille, and Camas valleys. This includes the cities of Somes Bar, Happy Camp, Ashland, Medford, Grants Pass, Cave Junction, Roseburg, Agness, and Powers. * WHEN...From noon to 8 PM PDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

At 613 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from near Succor Creek Campground to near Kuna to near Cinder Cone Butte. Movement was northeast at 35 mph. HAZARD...Wind gusts of 50 to 55 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Areas of blowing dust reducing visibilities. Minor damage to outdoor objects is possible. Strong thunderstorms will be near... Boise, Nampa, Caldwell, and Meridian around 620 PM MDT. Eagle, Garden City, Star, and Wilder around 630 PM MDT. Middleton, Notus, Sand Hollow, and Danskin Peak around 640 PM MDT. Firebird Speedway and Bogus Basin Ski Area around 650 PM MDT.