Aggregator

* WHAT...Hot temperatures. High temperatures 95 to 102 degrees. Limited overnight relief with low temperatures 61 to 72. * WHERE...Chelan, Coulee City, Leavenworth, Lewiston, Pomeroy, Brewster, Nespelem, Okanogan, Grand Coulee, Gifford, Othello, Cashmere, Pangborn Airport, Odessa, Wilbur, Peck, Ritzville, Omak, Quincy, Bridgeport, Plain, Culdesac, Moses Lake, Ephrata, Number 1 Canyon, Entiat, Tonasket, Alpowa Summit, Harrington, Mansfield, Clarkston, Creston, Badger Mountain Road, Number 2 Canyon, Oroville, Wenatchee, Lewiston Grade, Disautel Pass, Lapwai, and Waterville. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Hot temperatures will increase the risk of heat-related illnesses. Heat of this magnitude affects anyone without cooling and hydration as well as health systems and industries.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 1 PM to 9 PM PDT Tuesday. * IMPACTS...Abundant lightning on dry fuels resulting in the potential for numerous new fire starts. * AFFECTED AREA...In California, all of Fire weather zones 280, 281, 282, 284, and 285, and in Oregon, all of Fire weather zones 617, 620, 621, 622, 623, 624, and 625. * THUNDERSTORMS...Scattered thunderstorms with abundant lightning expected. Storms are likely to be wet, but lightning strikes outside of precipitation cores are possible, and may cause many new fire starts. Isolated overnight and early morning storms are possible east of the Cascades, but confidence is low. * OUTFLOW WINDS...Gusts of 35 to 50 mph could travel outward up to 25 miles from thunderstorm cores. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 1 PM to 9 PM PDT Tuesday. * IMPACTS...Abundant lightning on dry fuels resulting in the potential for numerous new fire starts. * AFFECTED AREA...In California, all of Fire weather zones 280, 281, 282, 284, and 285, and in Oregon, all of Fire weather zones 617, 620, 621, 622, 623, 624, and 625. * THUNDERSTORMS...Scattered thunderstorms with abundant lightning expected. Storms are likely to be wet, but lightning strikes outside of precipitation cores are possible, and may cause many new fire starts. Isolated overnight and early morning storms are possible east of the Cascades, but confidence is low. * OUTFLOW WINDS...Gusts of 35 to 50 mph could travel outward up to 25 miles from thunderstorm cores. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED IN CENTRAL OREGON THROUGH THIS EVENING... .Hot conditions, combined with low relative humidities and an unstable air mass, have the potential to create significant, plume-dominated fire growth in the area surrounding the Flat Fire. * AFFECTED AREA...Fire Weather Zones 700 Central Mountains of Oregon and 704 Northern Deschutes National Forest. * TIMING...Until 9 PM PDT this evening. * MIXING HEIGHT...As high as 8,000 ft AGL Today and 11,500 ft AGL Monday. * RELATIVE HUMIDITY...As low as 23 percent. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.

* 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...Scattered thunderstorms with critically dry fuels. * OUTFLOW WINDS...Gusts up to 40 mph may travel outward up to 25 miles from thunderstorm cores. * IMPACTS...Thunderstorm outflow winds may result in unanticipated erratic fire spread. High instability may result in fire growth. Frequent lightning and critically dry fuels may result in fire starts.

* WHAT...Dangerously hot conditions with high temperatures of 90-97F and overnight low temperatures of 60-70F expected. * WHERE...Greater Portland/Vancouver Metro, Western and Central Columbia River Gorge, the Corbett area and the Hood River Valley, Central and Southern Willamette Valley, Foothills of the Northern and Central Oregon Cascades, Lower Columbia River and Cowlitz River Valleys, and South Washington Cascade Foothills. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling. * ADDITIONAL DETAILS...The warmest overnight lows are expected to occur in the Columbia River Gorge and in urban areas from Salem northward.

* WHAT...Hot conditions with high temperatures of 85 to 92 degrees and overnight low temperatures of 60-68F possible. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon, North and Central Coast Range Valleys of Oregon, and Willapa and Wahkiakum Lowlands. * WHEN...Until 5 AM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

* WHAT...Dangerously hot conditions with high temperatures of 90-97F and overnight low temperatures of 60-70F expected. * WHERE...Greater Portland/Vancouver Metro, Western and Central Columbia River Gorge, the Corbett area and the Hood River Valley, Central and Southern Willamette Valley, Foothills of the Northern and Central Oregon Cascades, Lower Columbia River and Cowlitz River Valleys, and South Washington Cascade Foothills. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling. * ADDITIONAL DETAILS...The warmest overnight lows are expected to occur in the Columbia River Gorge and in urban areas from Salem northward.

* WHAT...Hot conditions with high temperatures of 85 to 92 degrees and overnight low temperatures of 60-68F possible. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon, North and Central Coast Range Valleys of Oregon, and Willapa and Wahkiakum Lowlands. * WHEN...Until 5 AM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.

The Oregon Department of Environmental Quality and the Lane Regional Air Protection Agency have continued an Air Quality Advisory, which is IN EFFECT UNTIL 10 PM PDT THIS EVENING. An Air Quality Advisory for Ozone remains in effect. High levels of ozone in the lower atmosphere in the region combined with forecasted conditions will cause air quality to reach unhealthy levels at times through this evening. Pollutants in smoke can cause burning eyes, runny nose, aggravate heart and lung diseases, and aggravate other serious health problems. Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition. More information about air quality can be found at: www.orcaa.org www.swcleanair.gov www.oregon.gov/DEQ www.lrapa.org

The Oregon Department of Environmental Quality and the Lane Regional Air Protection Agency have continued an Air Quality Advisory, which is IN EFFECT UNTIL 10 PM PDT THIS EVENING. An Air Quality Advisory for Ozone remains in effect. High levels of ozone in the lower atmosphere in the region combined with forecasted conditions will cause air quality to reach unhealthy levels at times through this evening. Pollutants in smoke can cause burning eyes, runny nose, aggravate heart and lung diseases, and aggravate other serious health problems. Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition. More information about air quality can be found at: www.orcaa.org www.swcleanair.gov www.oregon.gov/DEQ www.lrapa.org

A surge of deep monsoonal moisture combined with a slow-moving upper trough will bring periods of heavy showers and thunderstorms across the region. This airmass contains anomalously high moisture content, supporting the potential for excessive rainfall. Flash flooding will be possible, especially in steep terrain, narrow canyons, and near recent burn scars where soils are less able to absorb rainfall. The greatest risk will be Tuesday afternoon through Wednesday evening as repeated rounds of storms move through. * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of Idaho, including the following areas, Boise Mountains, Camas Prairie, Lower Treasure Valley, Owyhee Mountains, Southern Twin Falls County, Southwest Highlands, Upper Treasure Valley, Upper Weiser River, West Central Mountains and Western Magic Valley. Portions of Oregon, including the following areas, Baker County, Harney County, Malheur County and Oregon Lower Treasure Valley. * WHEN...From Tuesday afternoon through Wednesday evening. * IMPACTS...Heavy rainfall could trigger flash flooding or debris flows in and near recent wildfire burn scars. In addition urban street flooding is possible with the stronger storms. * ADDITIONAL DETAILS... - https://www.weather.gov/safety/flood

* WHAT...Hot conditions with high temperatures ranging from the upper 80s to low 90s and low temperatures in the mid 60s. This will pose a major risk of heat-related illness. * WHERE...City of Seattle, Eastside, and Lowlands of Pierce and Southern King Counties. * WHEN...Until 5 AM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* WHAT...Hot conditions with high temperatures ranging from the upper 80s to upper 90s and low temperatures mostly in the 60s. This will pose a major risk of heat-related illness. * WHERE...Foothills and Valleys of the North Cascades, Foothills and Valleys of Central King County, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Snohomish and Northern King Counties, and Foothills and Valleys of Thurston and Lewis Counties. * WHEN...Until 5 AM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* WHAT...Hot conditions with high temperatures ranging from the 80s to near 90 degrees expected and low temperatures in the 60s. This will pose a moderate risk of heat-related illness. * WHERE...Lake Crescent Area Including US 101. * WHEN...Until 5 AM 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 with high temperatures in the mid to upper 80s and low temperatures in the 60s to 70s. This will pose a moderate risk of heat-related illness. * WHERE...Eastern Strait of Juan de Fuca and Western Strait of Juan de Fuca. * WHEN...Until 5 AM PDT Tuesday. * 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 high temperatures ranging from the mid 80s to low 90s expected and low temperatures mostly in the 60s. This will pose a moderate risk of heat-related illness. * WHERE...Portions of northwest and west central Washington. * WHEN...Until 5 AM 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.

* 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. * RELATIVE HUMIDITY...As low as 20 to 30 percent. * TEMPERATURES...85 to near 95. * STABILITY...Unstable conditions can be expected. * IMPACTS...A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area.

The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms and high instability, which is in effect until 8 PM PDT this evening. * 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...Scattered thunderstorms with critically dry fuels. * OUTFLOW WINDS...Gusts up to 40 mph may travel outward up to 25 miles from thunderstorm cores. * IMPACTS...Thunderstorm outflow winds may result in unanticipated erratic fire spread. High instability may result in fire growth. Frequent lightning and critically dry fuels may result in numerous fire starts.

...HOT, DRY, AND UNSTABLE CONDITIONS FOR MONDAY AND TUESDAY ALONG WITH THE POTENTIAL FOR ISOLATED THUNDERSTORMS WITH GUSTY OUTFLOW WINDS... .Hot, dry, and unstable conditions are forecast along the East Slopes of the Central and Northern Cascades as well as the Methow Valley Monday and Tuesday. In addition, we are monitoring the potential for isolated thunderstorms on Monday and Tuesday afternoons that could result in new fire starts along with gusty outflow winds. * Affected Area: East Washington Central Cascades (Zone 696), East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697), East Washington North Cascades (Zone 698) and Methow Valley (Zone 704). * Winds: Southeast around 5 mph in the afternoon shifting to northwest in the evening, except gusty outflow winds near thunderstorms. * Timing: Afternoon and evening for both Monday and Tuesday. * Relative Humidities: Below 4000 feet: 13 to 20 percent. Above 4000 feet: 20 to 30 percent. * Temperatures: Below 4000 feet: 90 to 102 degrees. Above 4000 feet: 75 to 90 degrees. * Lightning: A 5-10 percent chance of dry thunderstorms late Monday afternoon into the evening. A 20-25 percent chance of thunderstorms Tuesday afternoon and evening mainly over the higher terrain. * Impacts: Hot, dry, unstable conditions may lead to rapid fire growth on any new or existing fires. Isolated thunderstorms will bring the potential for new fire starts, as well as gusty outflow winds.