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The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from 11 PM this evening to 11 AM PDT Sunday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 683 Central Oregon Coast Range and Fire Weather Zone 685 Southern Willamette Valley. * 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. * OUTFLOW WINDS...Gusts up to 40 mph possible.

* WHAT...High temperatures 100 to 110 through Monday. Lows in the mid 60s to mid 70s. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat will increase the risk of heat-related illnesses, especially those without effective cooling or adequate hydration.

* WHAT...Hot temperatures. Valley high temperatures 98 to 105. Highs in the mountains in the 80s and 90s. * WHERE...Stevens Pass, Holden Village, and Stehekin. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat will increase the risk of heat-related illnesses, especially those without effective cooling or adequate hydration.

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. The National Weather Service in Medford has replaced the Fire Weather Watch with a Red Flag Warning, which is in effect from 5 PM this afternoon to 11 PM PDT Sunday. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire Weather Zone 624. For this afternoon, scattered thunderstorms are possible roughly south of a line from Crater Lake to Summer Lake. Tonight, isolated to scattered thunderstorms could affect most of the zone. Sunday afternoon and evening, scattered thunderstorms are possible across the eastern portions of the Fremont-Winema National Forest, along the Klamath/Lake County border and eastward. * THUNDERSTORMS...Isolated to scattered thunderstorms are expected late this afternoon and tonight and again Sunday afternoon and evening. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * ADDITIONAL DETAILS...Thunderstorm activity is mainly expected during the afternoons and evenings. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. The National Weather Service in Medford has replaced the Fire Weather Watch with a Red Flag Warning, which is in effect from 2 PM to 11 PM PDT Sunday. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire weather zone 625. * THUNDERSTORMS...Isolated to scattered thunderstorms are expected Sunday afternoon and evening. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. The National Weather Service in Medford has replaced the Fire Weather Watch with a Red Flag Warning, which is in effect from 5 PM this afternoon to 8 AM PDT Sunday. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire Zones 615, 616, 617, 618, 619, 620, 622, and 623. * THUNDERSTORMS...Isolated to scattered thunderstorms are expected late tonight into early Sunday morning. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...POTENTIAL FOR ABUNDANT LIGHTNING ON SUNDAY INTO EARLY MONDAY... The National Weather Service in Boise has issued a Red Flag Warning for lightning, which is in effect from noon MDT /11 AM PDT/ Sunday to midnight MDT /11 PM PDT/ Sunday night. The Fire Weather Watch is no longer in effect. * Thunderstorms...Scattered thunderstorms and abundant lightning Sunday afternoon and evening. Best chance is in all of Burns and southern and western Vale BLM. Storms will not be as dry as in recent days, with cores most likely having wetting rains. However, lightning outside of cores will pose significant fire concerns. * Outflow Winds...Up to 60 mph. * Timing...From noon MDT /11 AM PDT/ Sunday to midnight MDT /11 PM PDT/ Sunday night.

...HOT DRY AND UNSTABLE CONDITIONS SUNDAY ACROSS THE CASCADES... The National Weather Service in Spokane has issued a Red Flag Warning for hot, dry, and unstable conditions, which is in effect from 12 PM to 10 PM PDT Sunday. The Fire Weather Watch is no longer in effect. * Affected Area: Fire Weather Zone 696 East Washington Central Cascades (Zone 696), Fire Weather Zone 697 East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697), Fire Weather Zone 698 East Washington North Cascades (Zone 698), Fire Weather Zone 704 Methow Valley (Zone 704) and Fire Weather Zone 705 Foothills of Central Washington Cascades (Zone 705). * Winds: Southeast 6 to 11 mph shifting to the northwest 8 to 14 mph in the early evening. * Timing: 12 PM to 10 PM * Relative Humidities: 7 to 16 percent in the valleys and 16 to 24 percent over the higher terrain. * Thunderstorms: There is 10 to 15% chance for isolated thunderstorms Sunday evening and night. Gusty and erratic winds are possible with any thunderstorms that develop. * 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.

* WHAT...Dangerously hot conditions with temperatures of 100 to 110 degrees expected. 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 this morning 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 temperatures of 95 to 105 degrees expected. 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 this morning 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 temperatures of 100 to 110 degrees expected. 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 this morning 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 temperatures of 95 to 105 degrees expected. 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 this morning 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.

...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED THROUGH SUNDAY... A strong ridge of high pressure will amplify over the Pacific Northwest leading to very hot, dry, and unstable conditions. The combination will result in conditions conducive to extreme fire behavior, particularly for any ongoing fires in the region. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * TIMING...11 AM Today to Sunday 11 PM. * 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.

The Oregon Department of Environmental Quality issued an air quality advisory for Klamath and northern Lake counties due to numerous wildfires burning in the region. DEQ also expects other areas of the state may see intermittent smoke from ongoing large wildfires, including eastern Douglas and northeast Jackson counties. The wildfire smoke combined with forecast conditions will cause air quality levels to fluctuate and could be at unhealthy levels. Smoke levels can change rapidly depending on the weather. Smoke can irritate the eyes and lungs and worsen some medical conditions. People most at risk include infants and young children, people with heart or lung disease, older adults and pregnant people. People can take the following precautions to protect their health: - Follow local burn restrictions to prevent deteriorating air quality. - Avoid strenuous outdoor activity during periods of poor air quality. - People with heart or lung problems and young children are especially vulnerable. These people should stay indoors while smoke levels are high. - Use certified High Efficiency Particulate Air (HEPA) filters in indoor heating, ventilation, cooling and air purification systems. - Avoid using wood-burning stoves and other sources of indoor smoke if possible. DEQs color-coded Air Quality Index provides current air quality conditions and ranks air quality as follows: Green is good. Yellow is moderate. Orange is unhealthy for sensitive groups such as children, the elderly, pregnant women and those with respiratory conditions. Red is unhealthy for everyone. Purple is very unhealthy for all groups. Maroon is hazardous. For additional information...please visit the web site at https://oregonsmoke.org

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms late this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. The National Weather Service in Medford has issued a Fire Weather Watch, which is in effect from Sunday afternoon through Sunday evening. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire weather zone 625. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible Sunday afternoon and evening. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms late this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. The National Weather Service in Medford has issued a Fire Weather Watch, which is in effect from this afternoon through Sunday evening. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire Weather Zone 624. For this afternoon and evening, scattered thunderstorms are possible roughly south of a line from Crater Lake to Summer Lake. For Sunday afternoon and evening, scattered thunderstorms are possible across the eastern portions of the Fremont-Winema National Forest, along the Klamath/Lake County border and eastward. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible late this afternoon and evening and again Sunday afternoon and evening. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * ADDITIONAL DETAILS...Thunderstorm activity is mainly expected during the afternoons and evenings. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

An upper level low will move up from the south along the California coast late this afternoon, and will tap into increasing mid-level moisture. Meanwhile, elevated instability will increase and this combined with a moderate to strong trigger could result in isolated to scattered thunderstorms late this evening into Sunday morning, and again Sunday afternoon and evening. Given how dry fuels are, along with continued hot temperatures, lightning efficiency will be high to very high for fire starts. * IMPACTS...Given the prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Additionally, gusty outflow winds will allow for new and existing fires to grow rapidly out of control. * AFFECTED AREA...All of Fire Zones 615, 616, 617, 618, 619, 620, 622, and 623. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible late tonight into early Sunday morning. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Afternoon high temperatures in the middle to upper 90s. * WHERE...Clark County, Columbia River Gorge, Upper Hood River Valley, and the Willamette Valley. * WHEN...From 11 AM to 11 PM PDT today. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Afternoon high temperatures in the middle to upper 90s. * WHERE...Clark County, Columbia River Gorge, Upper Hood River Valley, and the Willamette Valley. * WHEN...From 11 AM to 11 PM PDT today. * IMPACTS...Hot temperatures may cause heat illnesses.

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 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.