A shortwave ridge will bring dry and warming conditions through Wednesday, pushing temperatures to around 10 degrees above normal, before a series of weather systems brings a dramatic temperature swing from near 90 degrees on Friday to around 5 degrees below normal by Sunday.
Sunshine much of the week with up and down temps in Scott Dorval’s video forecast.
The upper-level pattern will transition to a shortwave ridge over the area, bringing dry and warmer weather through Wednesday. Flow aloft will shift to the southwest on Wednesday as a shortwave trough approaches the Pacific Northwest coast. Current modeling tracks the trough along the Washington-Oregon border Wednesday afternoon, supporting a 20 to 30 percent chance of showers and thunderstorms across southeast Oregon and the west-central Idaho mountains. A lower probability of 5 to 10 percent exists for the Snake River Plain by Wednesday evening. Gusty southwest winds will shift to the northwest behind a cold frontal passage Wednesday afternoon and evening. The shower and storm threat will taper off across southeast Oregon Wednesday night, while a low chance remains in the west-central Idaho mountains…