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The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late Saturday night through early Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 684 Northern and Central Willamette Valley. In Washington, Fire Weather Zone 633 Clark County Lowlands and Swift Reservoir Region. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late this afternoon through Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 683 Central Oregon Coast Range, Fire Weather Zone 685 Southern Willamette Valley, Fire Weather Zone 686 Northern Oregon Cascade Foothills, Fire Weather Zone 687 Central Oregon Cascade Foothills, Fire Weather Zone 688 Mt. Hood National Forest Region, Fire Weather Zone 689 Northern Willamette National Forest and Fire Weather Zone 690 Southern Willamette National Forest. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late Saturday night through early Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 684 Northern and Central Willamette Valley. In Washington, Fire Weather Zone 633 Clark County Lowlands and Swift Reservoir Region. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

* WHAT...High temperatures of up 100 to 108 degrees expected. * WHERE...Klamath, Modoc, Lake, and central and eastern Siskiyou counties, including Klamath Falls, Weed, Yreka, Mount Shasta City, Lakeview, Alturas, Chiloquin, Chemult, Fort Rock, and the Christmas Valley. * WHEN...From 11 AM this morning to 11 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses to occur.

* WHAT...Temperatures up to 102 with lower elevation valleys near the Snake River up to 106. * WHERE...Baker County. * WHEN...Until 8 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur.

* WHAT...Temperatures of 100 to 103 in the lowest elevations. * WHERE...Portions of south central and southwest Idaho and southeast Oregon. * WHEN...Until 9 PM MDT /8 PM PDT/ Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur.

* WHAT...Dangerously hot conditions with temperatures up to 104 to 108. * WHERE...Portions of southwest and west central Idaho and southeast Oregon. * WHEN...Until 9 PM MDT /8 PM PDT/ Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.

Oregon Department of Environmental Quality has issued an Air Quality Advisory...IN EFFECT UNTIL 5 PM PDT MONDAY. A Smoke Air Quality Advisory has been issued. Wildfires burning in the region combined with forecasted conditions will cause air quality to reach unhealthy levels. Pollutants in smoke can cause burning eyes...runny nose...aggravate heart and lung diseases...and aggravate other serious health problems. Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition. For additional information...please visit the Web site at http://www.oregon.gov/DEQ

Oregon Department of Environmental Quality has issued an Air Quality Advisory...IN EFFECT FROM 10 AM SATURDAY TO MIDNIGHT PDT SATURDAY NIGHT. An Air Quality Advisory for Ozone has been issued. High levels of ozone in the lower atmosphere in the region combined with forecasted conditions will cause air quality to reach unhealthy levels at times through Saturday evening. Smog and Ozone irritates the eyes, nose and lungs, and contributes to breathing problems. Consult your health care provider if these symptoms worsen. For additional information...please visit the Web site at http://www.oregon.gov/DEQ

...HOT DRY AND UNSTABLE CONDITIONS SUNDAY ACROSS THE CASCADES... * Affected Area: Fire Weather Zone 696 East Washington Central Cascades, Fire Weather Zone 697 East Portion of North Cascades National Park/Lake Chelan National Recreation Area, Fire Weather Zone 698 East Washington North Cascades, Fire Weather Zone 704 Methow Valley and Fire Weather Zone 705 Foothills of Central Washington Cascades. * Winds: Southeast 5 to 10 mph becoming northwest 5 to 10 mph towards sunset. * Timing: 3 PM to 10 PM * Relative Humidities: 7 to 16 percent in the valleys and 16 to 24 percent over the higher terrain. * Temperatures: Up to 108. * Impacts: Unstable conditions could lead to plume dominated fires. Rapid fire spread with any new or existing fires. These conditions may overwhelm initial attack capabilities.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late Saturday night through late Sunday night. * AFFECTED AREA...In Washington, Fire Weather Zone 634 Southern Gifford Pinchot National Forest, Fire Weather Zone 635 Mt. Adams Ranger District of the Gifford-Pinchot National Forest and Fire Weather Zone 636 Western Columbia River Gorge in Oregon and Washington. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late Saturday night through Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 684 Northern and Central Willamette Valley. In Washington, Fire Weather Zone 633 Clark County Lowlands and Swift Reservoir Region. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from late Saturday night through Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 684 Northern and Central Willamette Valley. In Washington, Fire Weather Zone 633 Clark County Lowlands and Swift Reservoir Region. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from Saturday afternoon through Sunday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 683 Central Oregon Coast Range, Fire Weather Zone 685 Southern Willamette Valley, Fire Weather Zone 686 Northern Oregon Cascade Foothills, Fire Weather Zone 687 Central Oregon Cascade Foothills, Fire Weather Zone 688 Mt. Hood National Forest Region, Fire Weather Zone 689 Northern Willamette National Forest and Fire Weather Zone 690 Southern Willamette National Forest. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

* WHAT...Dangerously hot conditions with afternoon temperatures of 100-110 degrees expected over the weekend. This will pose a Major risk of heat-related illness. * WHERE...Portions of central, north central, and northeast Oregon and central, south central, and southeast Washington. * WHEN...From 11 AM Saturday to 10 PM PDT Monday. * IMPACTS...Extreme 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 afternoon temperatures of 95-105 degrees expected over the weekend. This will pose a Moderate to Major risk of heat-related illness. * WHERE...In Oregon, Central Oregon, Ochoco-John Day Highlands, and North Central Oregon. In Washington, Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...From 11 AM Saturday to 8 PM PDT Monday. * 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...Dangerously hot conditions with afternoon temperatures of 100-110 degrees expected over the weekend. This will pose a Major risk of heat-related illness. * WHERE...Portions of central, north central, and northeast Oregon and central, south central, and southeast Washington. * WHEN...From 11 AM Saturday to 10 PM PDT Monday. * IMPACTS...Extreme 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 afternoon temperatures of 95-105 degrees expected over the weekend. This will pose a Moderate to Major risk of heat-related illness. * WHERE...In Oregon, Central Oregon, Ochoco-John Day Highlands, and North Central Oregon. In Washington, Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...From 11 AM Saturday to 8 PM PDT Monday. * 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.

Oregon Department of Environmental Quality has issued an Air Quality Advisory...IN EFFECT UNTIL 5 PM PDT MONDAY. A Smoke Air Quality Advisory has been issued. Wildfires burning in the region combined with forecasted conditions will cause air quality to reach unhealthy levels. Pollutants in smoke can cause burning eyes...runny nose...aggravate heart and lung diseases...and aggravate other serious health problems. Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition. For additional information...please visit the Web site at http://www.oregon.gov/DEQ

...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED SATURDAY THROUGH SUNDAY... A strong ridge of high pressure will amplify over the Pacific Northwest this weekend leading to hot, dry, and unstable conditions. The combination will result in conditions conducive to extreme fire behavior, particularly for any ongoing fires in the region. The National Weather Service in Pendleton has issued a Red Flag Warning for dry and unstable conditions, which is in effect from 11 AM Saturday to 11 PM PDT Sunday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * TIMING...Saturday 11 AM to Sunday 11 PM. * WINDS...Northeast 5 to 12 mph. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 95 to 105 degrees. * IMPACTS...Current fires could exhibit extreme fire behavior. * HAINES...As high as 6.