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* IMPACTS...Any fires that develop could spread rapidly. * AFFECTED AREA...In California...Fire weather zone 280. In Oregon, fire weather zone 618, 619, and 620. This includes portions of the Western Klamath National Forest, Southern Oregon Coast, Western Siskiyou National Forest, and the Illinois Valley. Poor RH recovery and gusty northeast winds will affect ridges overnight, while all of the area will receive gusty northeast winds and low RH in the afternoons. * WIND...Through this morning, east winds 15 to 30 mph with gusts up to 40 mph. This afternoon 10 to 20 mph with gusts up to 30 mph, then increasing to 15 to 25 mph with gusts up to 35 mph tonight into Tuesday morning. * HUMIDITY...Single digits to upper teens in the afternoon. Recoveries only 25 to 50 percent this morning and 20 to 35 percent tonight. * 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 Fire Weather Watch, which is in effect from this evening through Tuesday morning. * IMPACTS...Any fires that develop will likely spread rapidly. * AFFECTED AREA...Fire weather zones 621, 622 and 623. This includes the Siskiyou Mountains, portions of the Rogue River National Forest in the Eastern Rogue Valley region and the Winema National Forest of westernmost Klamath County nearest the Southern Oregon Cascades. * WIND...Tonight into Tuesday morning, east winds 15 to 25 mph with gusts up to 35 mph. * HUMIDITY...Relative humidity recoveries tonight into Tuesday morning of only 20 to 35 percent. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Pullman, La Crosse, Uniontown, Oakesdale, Colfax, Tekoa, and Rosalia. * WHEN...From 1 AM to 8 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Othello, Moses Lake, Coulee City, Creston, Spokane Valley, Fairfield, Airway Heights, Badger Mountain Road, Ephrata, Harrington, Ritzville, Downtown Spokane, Quincy, Mansfield, Grand Coulee, Davenport, Rockford, Wilbur, Cheney, Odessa, and Waterville. * WHEN...From 1 AM to 8 AM PDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

* WHAT...Sub-freezing temperatures as low as 26 expected. * WHERE...Clark Fork, Mullan, Flowery Trail Road, Springdale-Hunters Road, Priest River, Athol, Inchelium, Metaline Falls, Newport, Northport, Chewelah, Orin-Rice Road, Ione, Schweitzer Mountain Road, Kellogg, Boulder Creek Road, Highway 20 Wauconda Summit, Fernwood, St. Maries, Fourth Of July Pass, Wauconda, Republic, Dobson Pass, Metaline, Kettle Falls, Pinehurst, Tiger, Deer Park, Fruitland, Chesaw Road, Wallace, Sandpoint, Bonners Ferry, Sherman Pass, Eastport, Lookout Pass, Colville, and Osburn. * WHEN...From 1 AM to 8 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Bridgeport, Craigmont, Worley, Oroville, Okanogan, Hayden, Nespelem, Omak, Nezperce, Coeur d'Alene, Disautel Pass, Kamiah, Post Falls, Tonasket, Winchester, Soldiers Meadow Road, and Brewster. * WHEN...From 1 AM to 8 AM PDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

* IMPACTS...Any fires that develop could spread rapidly. * AFFECTED AREA...In California...Fire weather zone 280. In Oregon, fire weather zone 618, 619, and 620. This includes portions of the Western Klamath National Forest, Southern Oregon Coast, Western Siskiyou National Forest, and the Illinois Valley. Poor RH recovery and gusty northeast winds will affect ridges overnight, while all of the area will receive gusty northeast winds and low RH in the afternoons. * WIND...Tonight into Monday morning, 15 to 30 mph with gusts up to 40 mph. Monday afternoon 10 to 20 mph with gusts up to 30 mph, then increasing to 15 to 25 mph with gusts up to 35 mph Monday night into Tuesday morning. * HUMIDITY...Single digits to upper teens in the afternoon. Recoveries only 25 to 50 percent tonight and 20 to 35 percent Monday night. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...Grande Ronde Valley. * WHEN...From 11 PM this evening to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Areas of sub-freezing temperatures are expected overnight into Monday morning in cold-prone locations of the Grande Ronde Valley.

* WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...Central Oregon. * WHEN...From 11 PM this evening to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Areas of sub-freezing temperatures are expected overnight into Monday morning in cold-prone locations of central Oregon.

* WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...Wallowa County. * WHEN...From 11 PM this evening to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Widespread sub-freezing temperatures are expected overnight into Monday morning in cold-prone locations of Wallowa Valley.

* WHAT...Northwest winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Kittitas Valley. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Patchy blowing dust can also be expected.

* WHAT...Visibility between one-quarter and one mile in blowing dust. * WHERE...Lower Columbia Basin of Washington and Foothills of the Blue Mountains of Washington. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hazardous driving conditions due to reduced visibility. * ADDITIONAL DETAILS...Blowing dust has developed in northern Franklin, Walla Walla, and Columbia counties between HWY395 and HWY12. Additional areas of blowing dust are expected to develop this afternoon.

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Grande Ronde Valley and Wallowa County. * WHEN...From 11 PM this evening to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

The National Weather Service in Spokane has issued a * Dust Storm Warning for... Northeastern Adams County in eastern Washington... North central Whitman County in eastern Washington... Southeastern Lincoln County in eastern Washington... * Until 330 PM PDT. * At 225 PM PDT, a dust channel was 7 miles east of Ritzville, or 37 miles southwest of Cheney, moving east at 35 mph. HAZARD...Less than a quarter mile visibility. SOURCE...Trained weather spotters reported zero to one-quarter visibility 7 miles northwest of Ritzville at 140 PM. IMPACT...Dangerous life-threatening travel. * This includes the following highways... Interstate 90 in Washington between mile markers 212 and 247. U.S. Highway 395 in Washington between mile markers 94 and 96. Locations impacted include... Ritzville, Sprague, Lamont, Marcellus, Tokio, Revere, and Packard.

* WHAT...Northwest winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Kittitas Valley. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Patchy blowing dust can also be expected.

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Grande Ronde Valley and Wallowa County. * WHEN...From 11 PM this evening to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

The National Weather Service in Spokane has issued a * Dust Storm Warning for... Northeastern Whitman County in eastern Washington... Southeastern Lincoln County in eastern Washington... Southern Spokane County in northeastern Washington... * Until 300 PM PDT. * At 127 PM PDT, a dust channel was 14 miles east of Ritzville, or 32 miles southwest of Cheney, moving east at 25 mph. HAZARD...Less than a quarter mile visibility with strong wind in excess of 40 mph. SOURCE...Doppler radar. IMPACT...Dangerous life-threatening travel. * This includes the following highways... Interstate 90 in Washington between mile markers 251 and 253. U.S. Highway 195 in Washington between mile markers 35 and 78. Locations impacted include... Colfax, Palouse, Tekoa, Fairfield, Garfield, Rosalia, St. John, Oakesdale, Endicott, Malden, Latah, Farmington, Waverly, Lamont, Amber, Steptoe, Belmont, Diamond, Thornton, and Pine City.

The National Weather Service in Medford has issued a Red Flag Warning, which is in effect from 8 PM this evening to 11 AM PDT Tuesday. * IMPACTS...Any fires that develop could spread rapidly. * AFFECTED AREA...In California...Fire weather zone 280. In Oregon, fire weather zone 618, 619, and 620. * WIND...Tonight, 15 to 25 mph. Tomorrow afternoon 10 to 20 mph, but increasing to 15 to 25 mph Monday night. Occasional gusts around 30 to 40 mph will be possible through this stretch. * HUMIDITY...Single digits to upper teens in the afternoon. Recoveries only around 20 to 50 percent the next couple nights. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

...BREEZY WINDS AND LOW HUMIDITY TODAY... .A dry cold front passage earlier this morning will result in breezy winds developing and persisting through this evening. Very dry air filtering into the region behind the cold front will result in relative humidity quickly falling in many locations of the Columbia Basin. As a result, this area will be susceptible to rapid fire spread. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Rapid fire spread may occur, particularly in dry grassy areas.

...BREEZY WINDS AND LOW HUMIDITY TODAY... .A dry cold front passage earlier this morning will result in breezy winds developing and persisting through this evening. Very dry air filtering into the region behind the cold front will result in relative humidity quickly falling in many locations of the Columbia Basin. As a result, this area will be susceptible to rapid fire spread. * AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of Oregon and 691 Lower Columbia Basin. * WINDS...West 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Rapid fire spread may occur, particularly in dry grassy areas.