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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 Wednesday. * AFFECTED AREA...In Washington, Fire Weather Zone 632 Cowlitz County Foothills. * 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 Red Flag Warning for thunderstorms, which is in effect from 5 PM this afternoon to 8 AM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 684 Northern and Central Willamette Valley, Fire Weather Zone 686 Northern Oregon Cascade Foothills and Fire Weather Zone 688 Mt. Hood National Forest Region. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Lightning and critically dry fuels may result in numerous fire starts. * OUTFLOW WINDS...There is a 10% chance for wind gusts in excess of 50 mph from the strongest storms through this evening. * 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 Red Flag Warning for thunderstorms, which is in effect until 5 AM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 685 Southern Willamette Valley, 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...Lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread. * OUTFLOW WINDS...There is a 10% chance for wind gusts in excess of 50 mph from the strongest storms through this evening. * 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 high temperatures up to 110 possible at low elevations. Hottest days Sunday and Monday. * WHERE...Portions of south central, southwest and west central Idaho and southeast Oregon. * WHEN...From Thursday afternoon through Tuesday evening. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.

An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology An Air Quality Alert, issued for all of Chelan County plus the Methow Valley down to Brewster in Okanogan County will remain in effect until further notice, due to expected smoke from the Pioneer Fire and other regional wildfires. Particulate matter (PM2.5) may reach Unhealthy and Unhealthy for Sensitive Groups levels. Health Impacts and Recommended Actions: When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air. When air quality is Unhealthy for Sensitive Groups, sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure. Agricultural and outdoor burning restrictions are in effect.

* WHAT...High concentration of smoke particulates from wildfires in Oregon and northern California. * WHERE...Baker, Harney, and Malheur Counties. * WHEN...AIR QUALITY ALERT IN EFFECT UNTIL NOON PDT WEDNESDAY. * 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.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 2 PM this afternoon to 11 PM PDT this evening. * AFFECTED AREA...Douglas county east of I-5. Also, northern and eastern portions of Modoc County. * THUNDERSTORMS...Isolated to scattered thunderstorms (10 to 30 percent chance) . * OUTFLOW WINDS...Gusts 40 to 50 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

* AFFECTED AREA...Significant portions of fire weather zones 617,623, 624, and 625, roughly along and north of a line from Lakeview to Crater Lake. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible Tuesday. 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...Strong, gusty winds and critically dry humidities will allow for new and existing fires to grow rapidly out of control. Outdoor burning is banned during fire season. * AFFECTED AREA...The southeastern portion of Zone 622 which includes the Rogue Valley and the Salt Creek Fire. * WIND...South 15 to 20 mph with gusts 25 to 30 mph. Winds shift to the west to northwest around 1700 local time. * HUMIDITY...10 to 15 percent. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr * ADDITIONAL DETAILS...Isolated lightning (10 to 20 percent chance) is also expected mainly over the northern portion of the zone which will contribute to the fire weather threat.

...ISOLATED THUNDERSTORMS AND DRY, UNSTABLE CONDITIONS THIS AFTERNOON, OVERNIGHT, AND WEDNESDAY... A low pressure system will move north-northeastward into the Pacific Northwest late today through Wednesday night. This system will provide enough moisture and elevated instability for high- based showers and isolated thunderstorms to develop late this afternoon, overnight, and Wednesday. * AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 694 Yakama Alpine District and 695 East Washington South Central Cascade Mountains. * IMPACTS...Any lightning strikes combined with hot and dry conditions can create new fire starts. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible.

...ISOLATED THUNDERSTORMS AND DRY, UNSTABLE CONDITIONS THIS AFTERNOON, OVERNIGHT, AND WEDNESDAY... A low pressure system will move north-northeastward into the Pacific Northwest late today through Wednesday night. This system will provide enough moisture and elevated instability for high- based showers and isolated thunderstorms to develop late this afternoon, overnight, and Wednesday. * AFFECTED AREA...Fire Weather Zones 610 East Slopes of Central Oregon Cascades, 611 Deschutes National Forest -minus Sisters Ranger District, 639 East Slopes of the Northern Oregon Cascades and 640 Central Mountains of Oregon. * IMPACTS...Any lightning strikes combined with hot and dry conditions could cause new fire starts. * THUNDERSTORMS...Isolated to scattered dry thunderstorms are possible.

...ISOLATED THUNDERSTORMS AND DRY, UNSTABLE CONDITIONS THIS AFTERNOON, OVERNIGHT, AND WEDNESDAY... A low pressure system will move north-northeastward into the Pacific Northwest late today through Wednesday night. This system will provide enough moisture and elevated instability for high- based showers and isolated thunderstorms to develop late this afternoon, overnight, and Wednesday. The National Weather Service in Pendleton has issued a Red Flag Warning for dry and unstable conditions, which is in effect from 2 PM this afternoon to 11 PM PDT this evening. * AFFECTED AREA...Fire Weather Zone 642 Southern Blue and Strawberry Mountains. * TIMING...2 PM through 11 PM. * WINDS...South 5 mph or less. * RELATIVE HUMIDITY...As low as 11 percent. * TEMPERATURES...Up to 93. * IMPACTS...Any new fire starts will exhibit extreme fire behavior. Current fire on landscape will also exhibit extreme fire behavior. * HAINES...As high as 6.

...Abundant lightning for Burns BLM this afternoon and evening... The National Weather Service in Boise has issued a Red Flag Warning for lightning, which is in effect from 2 PM this afternoon to 11 PM PDT this evening. * Thunderstorms...Scattered coverage with little to no rainfall expected. * Outflow Winds...Up to 60 mph possible. * Timing...From 2 PM this afternoon to 11 PM PDT this evening.

...ISOLATED THUNDERSTORM CHANCES THIS AFTERNOON, OVERNIGHT, AND WEDNESDAY... A low pressure system will move north-northeastward into the Pacific Northwest late today through Wednesday night. This system will provide enough moisture and elevated instability for high- based showers and isolated thunderstorms to develop late this afternoon, overnight, and Wednesday. * AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 694 Yakama Alpine District and 695 East Washington South Central Cascade Mountains. * IMPACTS...Any lightning strikes combined with hot and dry conditions can create new fire starts. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible.

...ISOLATED THUNDERSTORM CHANCES THIS AFTERNOON, OVERNIGHT, AND WEDNESDAY... A low pressure system will move north-northeastward into the Pacific Northwest late today through Wednesday night. This system will provide enough moisture and elevated instability for high- based showers and isolated thunderstorms to develop late this afternoon, overnight, and Wednesday. * AFFECTED AREA...Fire Weather Zones 610 East Slopes of Central Oregon Cascades, 611 Deschutes National Forest -minus Sisters Ranger District, 639 East Slopes of the Northern Oregon Cascades and 640 Central Mountains of Oregon. * IMPACTS...Any lightning strikes combined with hot and dry conditions could cause new fire starts. * THUNDERSTORMS...Isolated to scattered dry thunderstorms are possible.

* 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 thunderstorms with LAL 3. * 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.

* WHAT...Hot conditions during the day for the valleys. Highs 93 to 105. Overnight lows mainly in the upper 50s and 60s. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...From noon today to 10 PM PDT Thursday. * IMPACTS...Heat will increase the risk of heat-related illnesses, especially those without effective cooling or adequate hydration.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 2 PM this afternoon to 11 PM PDT this evening. * AFFECTED AREA...Significant portions of fire weather zones 617, 623, 624, and 625, roughly along and north of a line from Lakeview to Crater Lake. * THUNDERSTORMS...Isolated to scattered thunderstorms are possible Tuesday. 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...Strong, gusty winds and critically dry humidities will allow for new and existing fires to grow rapidly out of control. Outdoor burning is banned during fire season. * AFFECTED AREA...The southeastern portion of Zone 622 which includes the Rogue Valley and the Salt Creek Fire. * WIND...South 15 to 20 mph with gusts 25 to 30 mph. Winds shift to the west to northwest around 1700 local time. * HUMIDITY...10 to 15 percent. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Daytime temperatures between 95 to 100 expected. Overnight lows between 65 to 70 will limit chances to recover from the heat Tuesday night. * WHERE...In Oregon, Central Columbia River Gorge I-84 Corridor, East Portland Metro, Inner Portland Metro, and West Columbia River Gorge I-84 Corridor. In Washington, Central Columbia River Gorge SR 14 Corridor, East Clark County Lowlands, Inner Vancouver Metro, and West Columbia River Gorge SR 14 Corridor. * WHEN...From 11 AM this morning to 8 AM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses.