In the Lower Columbia River, Tualatin Valley, West Hills and Chehalem Mountains, Inner Portland Metro, East Portland Metro, Outer Southeast Portland Metro, West Central Willamette Valley, East Central Willamette Valley, Benton County Lowlands, Linn County Lowlands, and Lane County Lowlands, the National Weather Service issued an updated cold weather advisory at 12:44 p.m. on Monday that will be in effect from 10 p.m. to Tuesday at 10 a.m.
According to the weather service, apparent (feels like) temperatures as low as 25 degrees are anticipated. In the far eastern Portland/Vancouver Metro region, Easterly winds with gusts of 25–30 mph over the Columbia River Gorge will cause temperatures to rise, but the wind chill will be near 25 degrees.
According to the weather service, prolonged exposure to these temperatures can result in hypothermia. To avoid hypothermia, people who intend to go outside should exercise common sense and wear warm clothing. Avoid staying outside in damp weather as this can make it more likely that the body will cool down and become hypothermic.
MORE: Lizzy Acker, a weather reporter, discusses the chilly weather alert
MORE: This map indicates which cities in the Willamette Valley could anticipate below-freezing temperatures on Monday night.
Understanding cold weather alerts
Warning of cold weather: Exercise caution. When seasonably cold air temperatures or wind chill values—but not exceptionally severe ones—are anticipated or happening, a cold weather advisory is issued. When you and your loved ones go outside, make sure you cover any exposed skin and wear suitable clothing.
Warning: Extreme cold: Act now! When dangerously low air temperatures or wind chill values are predicted or already occurring, an extreme cold warning is issued. Avoid venturing outside if there is an extreme cold warning in effect. Make sure at least one other person is aware of your whereabouts, wear layers if you must go outside, and cover any exposed skin. When you reach your destination safely, update them.
Be ready for extreme cold watch. When extremely low air temperatures or wind chill values are possible, an extreme cold watch is issued. As with a warning, change your plans so that you don’t spend the coldest hours of the day outside. Update your winter survival gear and make sure your car has at least half a tank of gas left.
United Robots offers a service called Advance Local Weather Alerts that gathers the most recent information from the National Weather Service using machine learning.
