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* 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...Until 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...Until 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... ...ISOLATED TO SCATTERED THUNDERSTORMS SUNDAY AFTERNOON AND EVENING... A strong ridge of high pressure will amplify over the Pacific Northwest leading to very hot, dry, and unstable conditions. An upper weather system will also clip the region Sunday, producing isolated to widely scattered thunderstorms across central Oregon in the afternoon. 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.

...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED THROUGH SUNDAY... ...ISOLATED TO SCATTERED THUNDERSTORMS SUNDAY AFTERNOON AND EVENING... A strong ridge of high pressure will amplify over the Pacific Northwest leading to very hot, dry, and unstable conditions. An upper weather system will also clip the region Sunday, producing isolated to widely scattered thunderstorms across central Oregon in the afternoon. 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 abundant lightning, which is in effect from noon to 10 PM PDT Sunday. * AFFECTED AREA...Fire Weather Zones 611 Deschutes National Forest -minus Sisters Ranger District and 640 Central Mountains of Oregon. * TIMING...Noon to 10 PM Sunday. * RELATIVE HUMIDITY...As low as 12 percent. * TEMPERATURES...Up to 97. * THUNDERSTORMS...Isolated to widely scattered. Lightning activity level of 2 to 3. * OUTFLOW WINDS...35 to 45 mph. Thunderstorm outflow winds may result in erratic fire spread. * IMPACTS...Any lightning strikes combined with hot and dry conditions could cause new fire starts.

* WHAT...High temperatures of up 100 to 108 degrees expected Saturday afternoon, and highs of 95 to 100 expected on Sunday. Despite somewhat cooler overnight lows, smoke from area wildfires will prevent relief from the heat overnight. * 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...Until 11 PM PDT Sunday. * IMPACTS...Hot temperatures combined with smoke may cause heat illnesses to occur.

* WHAT...Dangerously hot conditions with temperatures 104 to 108 at low elevations. * 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.

* 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.

...POTENTIAL FOR ABUNDANT LIGHTNING SUNDAY... * 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 concerns. * Outflow Winds...Up to 60 mph. * Timing...From noon MDT /11 AM PDT/ Sunday to midnight MDT /11 PM PDT/ Sunday night.

The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from 5 AM to 8 PM PDT Sunday. The Fire Weather Watch is no longer in effect. * 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. * OUTFLOW WINDS...Gusts up to 40 mph possible.

The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from 5 AM to 8 PM PDT Sunday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 686 Northern Oregon Cascade Foothills and Fire Weather Zone 688 Mt. Hood National Forest 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. * OUTFLOW WINDS...Gusts up to 40 mph possible.

The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from 11 PM this evening to 8 PM PDT Sunday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 687 Central Oregon Cascade Foothills, 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. * OUTFLOW WINDS...Gusts up to 40 mph possible.

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.