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* WHAT...Hot conditions with temperatures up to 98 degrees. This will pose a moderate risk of heat-related illness. * WHERE...Ochoco-John Day Highlands. * 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.

At 620 PM MDT/520 PM PDT/, Doppler radar was tracking thunderstorm outflow winds along a line extending from near Sheep Rock to near Vines Hill. Movement was north at 35 mph. HAZARD...Wind gusts up to 45 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Strong outflow winds will be near... Vale, Ironside Mountain, Brushy Hollow, and Buckbrush Poison Butte around 630 PM MDT. Ironside, Cow Valley, Jamieson, and Eldorado Pass around 640 PM MDT. Brogan and Brogan Hill Summit around 650 PM MDT.

At 519 PM PDT, trained weather spotters reported a strong thunderstorm near Bend, moving northeast at 20 mph. HAZARD...Wind gusts up to 40 mph and half inch hail. SOURCE...Trained weather spotters. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Bend, Redmond, Tumalo, and Powell Butte.

* 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. * THUNDERSTORMS...Scattered chance of thunderstorms over the Cascade mountains with LAL 3 during the afternoon and evening hours. * OUTFLOW WINDS...Gusty and erratic winds are possible in the vicinity of any thunderstorms that develop. * IMPACTS...Scattered lightning in dry fuels can cause multiple fire starts. Thunderstorms can also bring sudden sharp wind shifts on existing fires, causing rapid changes in a fire's rate of spread and direction of spread. Thunderstorm outflow winds can be a threat for several hours following the start of a new lightning-caused fire. If a fire were to begin, air quality may diminish in the surrounding area.

...VERY HOT, DRY, AND UNSTABLE CONDITIONS CONTINUE TODAY... A strong ridge of high pressure will remain over the area producing hot dry and unstable conditions especially to eastern portions of central Oregon. A weak weather disturbance will move up the coast helping to trigger isolated to scattered thunderstorms in central Oregon through the evening. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * TIMING...Until 11 PM this evening. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 100. * IMPACTS...Current fires could exhibit extreme fire behavior. * HAINES...As high as 5.

...VERY HOT, DRY, AND UNSTABLE CONDITIONS CONTINUE TODAY... A strong ridge of high pressure will remain over the area producing hot dry and unstable conditions especially to eastern portions of central Oregon. A weak weather disturbance will move up the coast helping to trigger isolated to scattered thunderstorms in central Oregon through the evening. * AFFECTED AREA...Fire Weather Zones 611 Deschutes National Forest -minus Sisters Ranger District and 640 Central Mountains of Oregon. * TIMING...Unitl 10 PM this evening. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 100. * 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 95 to 100 degrees this afternoon. * WHERE...Lake County and eastern Klamath County, Central Siskiyou County, South Central Siskiyou County, North Central and Southeast Siskiyou County, Northeast Siskiyou and Northwest Modoc Counties, Modoc County, and Klamath Basin. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Persistent heat will limit ability to cool down. Additionally, smoke combined with hot temperatures may heighten the potential for heat related illnesses due to limiting the ability to open windows for cooler air.

* 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...Holden Village, Stevens Pass, 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.

* AFFECTED AREA... In Washington, * Fire Weather Zone 634 - Southern Gifford Pinchot NF. * Fire Weather Zone 635 - Mount Adams District. * 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.

...ABUNDANT LIGHTNING THIS AFTERNOON AND EVENING... ...ABUNDANT LIGHTNING POSSIBLE AGAIN MONDAY... A Red Flag Warning remains in effect for lightning this afternoon and evening. A Fire Weather Watch for lightning is in effect from Monday afternoon through Monday evening. * Thunderstorms...Scattered thunderstorms and abundant lightning this 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. Isolated to scattered thunderstorms are expected again Monday afternoon and evening. * Outflow Winds...Up to 55 mph. * Timing...For the Red Flag Warning, until midnight MDT /11 PM PDT/ tonight. For the Fire Weather Watch, from Monday afternoon through Monday evening.

...ABUNDANT LIGHTNING THIS AFTERNOON AND EVENING... ...ABUNDANT LIGHTNING POSSIBLE AGAIN MONDAY... A Red Flag Warning remains in effect for lightning this afternoon and evening. A Fire Weather Watch for lightning is in effect from Monday afternoon through Monday evening. * Thunderstorms...Scattered thunderstorms and abundant lightning this 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. Isolated to scattered thunderstorms are expected again Monday afternoon and evening. * Outflow Winds...Up to 55 mph. * Timing...For the Red Flag Warning, until midnight MDT /11 PM PDT/ tonight. For the Fire Weather Watch, from Monday afternoon through Monday evening.

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

* 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: East to southeast 5 to 10 mph through Sunday afternoon. Wind shift to the west or northwest 10 to 15 mph Sunday afternoon into the evening. Localized wind gusts of 30 mph or more with showers and thunderstorms into Sunday evening. Winds significantly increase late Monday afternoon with the dry cold front passage to northwest 15 to 25 mph with gusts around 35 mph. * Relative Humidities: 7 to 16 percent in the valleys and 16 to 25 percent over the higher terrain. * Temperatures: 95 to 108 in the valleys. 80s and 90s in the mountains. * Impacts: Unstable conditions could lead to plume dominated fires Sunday. Isolated thunderstorms will bring the risk for new fire starts and gusty and erratic outflow winds. Rapid fire spread with any new or existing fires due to gusty winds Monday afternoon and evening.

* Affected Area: Fire Weather Zone 703 Okanogan Valley (Zone 703). * Winds: South 15 to 20 mph with gusts up to 30 mph. * Relative Humidities: 8 to 19 percent. * Temperatures: Up to 104. * Lightning: There is 10% chance for thunderstorms Monday afternoon and evening. Gusty outflow winds up to 35 mph possible. * Impacts: Rapid fire spread with any new or existing fires due to gusty winds. Isolated thunderstorms will bring the risk for new fire starts and gusty and erratic outflow winds.

* 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 with very little to no precipitation are expected this 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

* 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...Eastern portions of Fire Weather Zone 624, mainly over the eastern portions of the Fremont-Winema National Forest along the Klamath/Lake County border and areas eastward. * THUNDERSTORMS...Isolated to scattered thunderstorms with very little to no precipitation are expected this 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

Corrected to add Zone 636 to list of Oregon zones. * AFFECTED AREA... In Oregon, * Fire Weather Zone 686 - Northern Oregon Cascade Foothills. * Fire Weather Zone 688 - Mt. Hood National Forest Region. * Fire Weather Zone 636 - Western Columbia River Gorge. In Washington, * Fire Weather Zone 634 - Southern Gifford Pinchot NF. * Fire Weather Zone 635 - Mt. Adams Ranger District. * Fire Weather Zone 636 - Western Columbia River Gorge. * 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.

Corrected to add Zone 636 to list of Oregon zones. * AFFECTED AREA... In Oregon, * Fire Weather Zone 686 - Northern Oregon Cascade Foothills. * Fire Weather Zone 688 - Mt. Hood National Forest Region. * Fire Weather Zone 636 - Western Columbia River Gorge. In Washington, * Fire Weather Zone 634 - Southern Gifford Pinchot NF. * Fire Weather Zone 635 - Mt. Adams Ranger District. * Fire Weather Zone 636 - Western Columbia River Gorge. * 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.