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...Complex fire weather environment evolves this weekend... .Hot, dry and windy conditions will remain in place over most of Oregon today, although approaching monsoon moisture from the south will increase the threat of lightning across the forecast area this afternoon and evening. Storms will likely be on the drier side today given available moisture in the air. The threat for storms is higher on Sunday as the moisture content increases. ...FIRE WEATHER WATCH NOW IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND 625... * IMPACTS...Given the recent prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Any fires that develop will likely spread rapidly. * AFFECTED AREA...For the Red Flag Warning today, critical conditions due to gusty winds and low RH are expected north of a line from Chiloquin to Paisley while lightning on dry fuels is expected south. * WIND...Southwest 15 to 25 with gusts to 25 and 35 mph. * HUMIDITY...7 to 12 percent. * THUNDERSTORMS...Isolated to scattered high based storms that are likely to have very little to no precipitation, especially outside of storm cores. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 35 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * ADDITIONAL INFORMATION...The best chance for storms will be Sunday afternoon into Sunday evening. Isolated dry thunderstorms are more likely today as the atmosphere appears to be very dry. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...HOT, DRY, AND UNSTABLE WITH A CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY SUNDAY... Hot, dry, and unstable conditions coupled with a threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups and potential for extreme fire behavior. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 13 percent. * IMPACTS...The combination of sustained wind and low relative humidity will result in conditions conducive to rapid fire spread and extreme fire behavior.

...HOT, DRY, AND UNSTABLE WITH A CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY SUNDAY... Hot, dry, and unstable conditions coupled with a threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups and potential for extreme fire behavior. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * IMPACTS...New fire starts with cloud-to-ground lightning should be expected with any storms that develop. Gusty outflow winds will threaten fires with rapid growth. * THUNDERSTORMS...Any storms that develop will initially have little to no rainfall, but will be capable of producing strong, gusty outflow winds. * OUTFLOW WINDS...Gusts of 35 to 50 mph possible.

...HOT, DRY, AND UNSTABLE WITH A CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY SUNDAY... Hot, dry, and unstable conditions coupled with a threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups and potential for extreme fire behavior. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 13 percent. * IMPACTS...The combination of sustained wind and low relative humidity will result in conditions conducive to rapid fire spread and extreme fire behavior.

* WHAT...Hot conditions with temperatures 95-105 degrees expected. This will pose a moderate to locally 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 Sunday. * 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 95-105 degrees expected. This will pose a moderate to locally 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 Sunday. * 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.

...FIRE WEATHER WATCH NOW IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND 625... * IMPACTS...Given the recent prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Any fires that develop will likely spread rapidly. * AFFECTED AREA...For the Red Flag Warning for Saturday, critical conditions due to gusty winds and low RH are expected north of a line from Chiloquin to Paisley while abundant lightning on dry fuels is expected south. * WIND...Southwest 15 to 25 with gusting 25 and 35 mph. * HUMIDITY...7 to 12 percent. * THUNDERSTORMS...Isolated to scattered high based storms that are likely to have very little to no precipitation, especially outside of storm cores. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 35 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * ADDITIONAL INFORMATION...The best chance for storms will be Saturday afternoon into Saturday evening, then again Sunday afternoon into Sunday evening. Isolated thunderstorms are possible late Saturday night into Sunday morning. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...FIRE WEATHER WATCH NOW IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND 625... * IMPACTS...Given the recent prolonged stretch of very hot and very dry conditions, lightning efficiency will be high to very high for fire starts. Any fires that develop will likely spread rapidly. * AFFECTED AREA...For the Red Flag Warning for Saturday, critical conditions due to gusty winds and low RH are expected north of a line from Chiloquin to Paisley while abundant lightning on dry fuels is expected south. * WIND...Southwest 15 to 25 with gusting 25 and 35 mph. * HUMIDITY...7 to 12 percent. * THUNDERSTORMS...Isolated to scattered high based storms that are likely to have very little to no precipitation, especially outside of storm cores. Lightning strikes outside of precipitation cores are possible and cause for concern. * OUTFLOW WINDS...Gusts up to 35 mph. These outflow winds can travel up to 50 miles away from the thunderstorm that caused it. * ADDITIONAL INFORMATION...The best chance for storms will be Saturday afternoon into Saturday evening, then again Sunday afternoon into Sunday evening. Isolated thunderstorms are possible late Saturday night into Sunday morning. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...High concentration of smoke particulates from wild fires buring in Oregon and northern California * WHERE...Harney and Malheur Counties. * WHEN...AIR QUALITY ALERT IN EFFECT UNTIL 12 PM PDT MONDAY. * IMPACTS...Smoke can irritate the eyes, lungs and worsen some medical conditions. People most at risk to adverse health effects include infants, young children, people with heart or lung disease, older adults, and pregnant women. * ADDITIONAL DETAILS...Smoke levels can change rapidly depending on weather. Check current conditions on the Oregon Smoke Information Blog, DEQ's Air Quality Index, or by downloading the free OregonAIR app on your smartphone.

* WHAT...High temperatures of 95 to 105 degrees and lows of 55 to 65 are expected. * WHERE...Josephine and Jackson counties and eastern Curry County. This includes the entire Rogue Valley and the cities of Medford, Grants Pass, Cave Junction, and Butte Falls. * WHEN...Until 9 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Area rivers will be cold and can cause shock to swimmers.

* WHAT...High temperatures of 95 to 102 degrees with lows in the mid to upper 50s expected. * WHERE...In California, Modoc County and eastern Siskiyou County. This includes the cities and communities of Macdoel, Tulelake, Pondosa, Bray, Tennant, Dorris, Tionesta, Alturas, and Adin. In Oregon, Klamath and Lake counties. This includes the cities of Klamath Falls, Chemult, Summer Lake, Chiloquin, Malin, Keno, Sprague River, and Lakeview. * WHEN...Until 9 PM PDT Saturday. * IMPACTS...Hot temperatures may cause heat illnesses. Area rivers will be cold and can cause shock to swimmers.

* WHAT...High concentration of smoke particulates from wild fires buring in southern Oregon * WHERE...Harney and Malheur Counties. * WHEN...AIR QUALITY ALERT IN EFFECT UNTIL 12 PM PDT MONDAY. * IMPACTS...Smoke can irritate the eyes, lungs and worsen some medical conditions. People most at risk to adverse health effects include infants, young children, people with heart or lung disease, older adults, and pregnant women. * ADDITIONAL DETAILS...Smoke levels can change rapidly depending on weather. Check current conditions on the Oregon Smoke Information Blog, DEQ's Air Quality Index, or by downloading the free OregonAIR app on your smartphone.

...DRY AND BREEZY CONDITIONS EXPECTED IN THE LEE OF THE CASCADES ON SUNDAY AFTERNOON AND EVENING... Breezy winds, hot temperatures, and low relative humidity values will occur over the area on Sunday afternoon and evening. This will result in an elevated fire risk on existing or new fires. The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday afternoon through Sunday evening. * Affected Area: Fire Weather Zone 705 Foothills of Central Washington Cascades (Zone 705) and Fire Weather Zone 706 Waterville Plateau (Zone 706). * Winds: West 10 to 20 mph with gusts up to 35 mph. * Relative Humidities: 10 to 18 percent. * Impacts: The combination of gusty winds, low relative humidity values, hot temperatures, and dried fuels could lead to rapid fire spread on existing or new fires.

* WHAT...Hot conditions with temperatures 95-105 degrees expected. This will pose a moderate to locally 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 Sunday. * 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 95-105 degrees expected. This will pose a moderate to locally 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 Sunday. * 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.

...CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY... A threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday afternoon through Sunday evening. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 13 percent. * IMPACTS...New fire starts with cloud-to-ground lightning should be expected with any storms that develop. Gusty outflow winds will threaten fires with rapid growth.

...CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY... A threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * IMPACTS...New fire starts with cloud-to-ground lightning should be expected with any storms that develop. Gusty outflow winds will threaten fires with rapid growth. * THUNDERSTORMS...Any storms that develop will initially have little to no rainfall. * OUTFLOW WINDS...Gusts of 25 to 35 mph possible.

...CHANCE OF THUNDERSTORMS OVER SOUTHEAST OREGON THIS WEEKEND... ...DRY AND BREEZY CONDITIONS IN THE COLUMBIA BASIN AND KITTITAS VALLEY... A threat of isolated thunderstorms over southeast Oregon this weekend brings a risk of dry lightning startups. Breezy winds will also develop through the Cascade gaps Sunday, and will coincide with critically low RHs in the afternoon. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday afternoon through Sunday evening. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 13 percent. * IMPACTS...New fire starts with cloud-to-ground lightning should be expected with any storms that develop. Gusty outflow winds will threaten fires with rapid growth.

* WHAT...Hot conditions during the day for the valleys. Highs 95 to 105. Overnight lows will be in the upper 50s and 60s. * WHERE...Central and eastern Washington and parts of the Idaho Panhandle including the Okanogan Valley, Wenatchee and Waterville Plateau, Columbia Basin, Washington Palouse, Spokane and Coeur d'Alene area, the Lewiston Clarkston Valley and Camas Prairie. * WHEN...Until 10 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

* WHAT...Hot conditions during the day for the valleys. Highs 93 to 100. Overnight lows will be in the upper 50s and 60s. * WHERE...The Cascade valleys, the valleys of the Okanogan Highlands and northeast Washington, the north Idaho Panhandle and the Idaho Palouse. * WHEN...Until 10 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.