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* WHAT...Temperatures up to 103 Lower Snake Plain, Treasure Valley, and Weiser Basin. * WHERE...Portions of southwest Idaho and southeast Oregon. * WHEN...Until 8 PM MDT /7 PM PDT/ this evening. * IMPACTS...Hot temperatures may cause heat illnesses, especially for the young, elderly, and animals.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 2 PM to 8 PM PDT Wednesday. * IMPACTS...Any fires that develop will likely spread rapidly. * AFFECTED AREA...In CAZ285...Fire weather zone 285.In ORZ624... Fire weather zone 624.In ORZ625...Fire weather zone 625. * THUNDERSTORMS...Scattered afternoon and evening thunderstorms, mainly along and eats of the highway 97 corridor. * OUTFLOW WINDS...Gusts up to 45 mph. These outflow winds can travel up to 25 miles away from the thunderstorm that caused it. * DETAILEDURL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Temperatures up to 104 expected in the Lower Snake Plain, Treasure Valley, and Weiser Basin. * WHERE...Portions of southwest Idaho and southeast Oregon. * WHEN...From 11 AM MDT /10 AM PDT/ this morning to 8 PM MDT /7 PM PDT/ this evening. * IMPACTS...Hot temperatures may cause heat illnesses, especially for the young, elderly, and animals.

* WHAT...High temperatures between 93 and 104 degrees. Overnight lows in the upper 50s to mid 60s. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...Until 9 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses.

* Affected Area: Okanogan Valley (Zone 703), Foothills of Central Washington Cascades (Zone 705), Waterville Plateau (Zone 706) and Western Columbia Basin (Zone 707). * Winds: For the Wenatchee area and Waterville Plateau: West 15 to 25 mph with gusts up to 40 mph. For the Okanogan Valley and Western Columbia Basin West to Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidities: 11 to 19 percent. * Impacts: Rapid fire spread is possible with any new fire starts.

SVRMFR The National Weather Service in Medford has issued a * Severe Thunderstorm Warning for... West central Klamath County in south central Oregon... * Until 700 PM PDT. * At 636 PM PDT, a severe thunderstorm was located near Fort Klamath, or 17 miles south of Crater Lake, and is nearly stationary. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * Locations impacted include... Annie Creek Snow Park and Fort Klamath.

At 630 PM PDT, Doppler radar was tracking a strong thunderstorm over Worden, or 11 miles southwest of Klamath Falls, moving northwest at 15 mph. HAZARD...Wind gusts up to 50 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Miller Island Klamath Wildlife Area, Spring Island Boat Launch, Midland, Worden, Keno, Klamath River Campground, and Topsy Campground.

The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * Affected Area: Okanogan Valley (Zone 703), Foothills of Central Washington Cascades (Zone 705), Waterville Plateau (Zone 706) and Western Columbia Basin (Zone 707). * Winds: For the Wenatchee area and Waterville Plateau: West 15 to 25 mph with gusts up to 40 mph. For the Okanogan Valley and Western Columbia Basin West to Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidities: 11 to 19 percent. * Impacts: Rapid fire spread is possible with any new fire starts.

* WHAT...Hot conditions with temperatures up to 103 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington. * WHEN...Until 9 PM PDT Tuesday. * 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 with temperatures up to 97 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Simcoe Highlands. * WHEN...Until 9 PM 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 temperatures up to 100 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Kittitas Valley and Yakima Valley. * WHEN...Until 9 PM PDT Tuesday. * 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 with temperatures up to 100 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...In Oregon, Foothills of the Northern Blue Mountains of Oregon. In Washington, Foothills of the Blue Mountains of Washington. * WHEN...Until 9 PM PDT Tuesday. * 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 with temperatures up to 100 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Eastern Columbia River Gorge of Oregon and Washington. * WHEN...Until 9 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses. 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 up to 103 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington. * WHEN...Until 9 PM PDT Tuesday. * 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 with temperatures up to 97 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Foothills of the Southern Blue Mountains of Oregon and North Central Oregon. * WHEN...Until 9 PM 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 temperatures up to 100 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...In Oregon, Foothills of the Northern Blue Mountains of Oregon. In Washington, Foothills of the Blue Mountains of Washington. * WHEN...Until 9 PM PDT Tuesday. * 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 with temperatures up to 100 degrees. This will pose a moderate to major risk of heat-related illness. * WHERE...Eastern Columbia River Gorge of Oregon and Washington. * WHEN...Until 9 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses. 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...Temperatures up to 104 expected in the Lower Snake Plain, Treasure Valley, and Weiser Basin. * WHERE...Portions of southwest Idaho and southeast Oregon. * WHEN...From 11 AM MDT /10 AM PDT/ to 8 PM MDT /7 PM PDT/ Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses, especially for the young, elderly, and animals.

...DRY THUNDERSTORMS EXPECTED FOR CENTRAL OREGON TUESDAY, FOLLOWED BY DRY AND WINDY CONDITIONS ACROSS THE KITTITAS VALLEY AND WASHINGTON BASIN WEDNESDAY... .The high pressure currently leading to hot and dry conditions will start to break down Tuesday into Wednesday, allowing for dry thunderstorms to develop across central Oregon. Once high pressure has completely broken down on Wednesday, winds will pick up. With RHs having little time to recover from Monday and Tuesday's heat, this will lead to potentially critical fire weather conditions across the Kittitas Valley and into the Washington Columbia Basin. The National Weather Service in Pendleton has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Wednesday evening. * AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley and 691 Lower Columbia Basin of Washington. * TIMING...From Wednesday afternoon through Wednesday evening. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * WINDS...For the Kittitas Valley, northwest winds 20 to 30 mph with gusts up to 40 mph. For the Lower Columbia Basin of Washington, west-northwest winds 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 15 percent.

...DRY THUNDERSTORMS EXPECTED FOR CENTRAL OREGON TUESDAY, FOLLOWED BY DRY AND WINDY CONDITIONS ACROSS THE KITTITAS VALLEY AND WASHINGTON BASIN WEDNESDAY... .The high pressure currently leading to hot and dry conditions will start to break down Tuesday into Wednesday, allowing for dry thunderstorms to develop across central Oregon. Once high pressure has completely broken down on Wednesday, winds will pick up. With RHs having little time to recover from Monday and Tuesday's heat, this will lead to potentially critical fire weather conditions across the Kittitas Valley and into the Washington Columbia Basin. The National Weather Service in Pendleton has issued a Red Flag Warning for abundant lightning, which is in effect from 2 PM to 9 PM PDT Tuesday. * AFFECTED AREA...Fire Weather Zone 700 Central Mountains of Oregon. * TIMING...From 2 PM to 9 PM PDT Tuesday. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * RAINFALL AMOUNTS...Storms are mostly expected to be dry, with rainfall amounts less than a tenth of an inch. A few isolated storm cells could produce rainfall amounts of 0.1 to 0.2 inches. * OUTFLOW WINDS...As high as 45 mph.