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...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.

* 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.

* WHAT...Dangerously hot conditions. Afternoon high temperatures of 95 to 103 degrees accompanied by overnight low temperatures in the mid-60s to lower 70s. This will pose a major risk of heat-related illness. * WHERE...Kittitas Valley and Yakima Valley. * WHEN...From noon today to 10 PM PDT Thursday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to lower 70s. This will pose a major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington. * WHEN...From noon today to 10 PM PDT Thursday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to mid-70s. This will pose a moderate to locally major risk of heat-related illness. * WHERE...Eastern Columbia River Gorge of Oregon and Washington, Foothills of the Northern Blue Mountains of Oregon, and Foothills of the Blue Mountains of Washington. * WHEN...From noon today to 10 PM PDT Wednesday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to lower 70s. This will pose a moderate to locally major risk of heat-related illness. * WHERE...In Oregon, Foothills of the Southern Blue Mountains of Oregon and North Central Oregon. In Washington, Simcoe Highlands. * WHEN...From noon today to 10 PM PDT Wednesday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to lower 70s. This will pose a major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington. * WHEN...From noon today to 10 PM PDT Thursday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to lower 70s. This will pose a moderate to major risk of heat-related illness. * WHERE...John Day Basin. * WHEN...From noon today to 10 PM PDT Wednesday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to mid-70s. This will pose a moderate to locally major risk of heat-related illness. * WHERE...Eastern Columbia River Gorge of Oregon and Washington, Foothills of the Northern Blue Mountains of Oregon, and Foothills of the Blue Mountains of Washington. * WHEN...From noon today to 10 PM PDT Wednesday. * 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. Afternoon high temperatures of 95 to 105 degrees accompanied by overnight low temperatures in the lower 60s to lower 70s. This will pose a moderate to locally major risk of heat-related illness. * WHERE...In Oregon, Foothills of the Southern Blue Mountains of Oregon and North Central Oregon. In Washington, Simcoe Highlands. * WHEN...From noon today to 10 PM PDT Wednesday. * 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...High temperatures around 101 to 105 with low temperatures between 67 and 70 degrees. * WHERE...The valleys within Jackson and Josephine Counties. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Hot temperatures and warm overnight lows may affect anyone without adequate hydration or access to cooling facilities. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...THUNDERSTORMS TO INCREASE CHANCES OF RED FLAG CONDITIONS LATER TUESDAY INTO WEDNESDAY... An upper low pressure system will clip the region as it moves north offshore the PacNW. This system will provide enough elevated instability for isolated thunderstorms to develop late Tuesday through 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.

...THUNDERSTORMS TO INCREASE CHANCES OF RED FLAG CONDITIONS LATER TUESDAY INTO WEDNESDAY... An upper low pressure system will clip the region as it moves north offshore the PacNW. This system will provide enough elevated instability for isolated thunderstorms to develop late Tuesday through 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.

Re-transmitting the message. No changes to forecast. ...DRY AND A SLIGHT CHANCE FOR THUNDERSTORMS TUESDAY AFTERNOON INTO WEDNESDAY... .A slight chance for thunderstorms develop Tuesday afternoon as an upper level disturbance shifts south to north across the forecast area into Wednesday. * AFFECTED AREA...In Washington, Fire Weather Zone 633 Clark County Lowlands and Swift Reservoir Region, 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...2 (A slight chance of thunderstorms). * IMPACTS...Lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

Re-transmitting the message. No changes to forecast. ...DRY AND A SLIGHT CHANCE FOR THUNDERSTORMS TUESDAY AFTERNOON INTO WEDNESDAY... .A slight chance for thunderstorms develop Tuesday afternoon as an upper level disturbance shifts south to north across the forecast area into Wednesday. * 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...2 (A slight chance of thunderstorms). * IMPACTS...Lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.