The National Weather Service issued a winter weather advisory at 2:37 p.m. on Friday valid from 10 p.m. until Saturday noon for West Columbia River Gorge of Oregon above 500 ft, Clackamas County Cascade Foothills,

A winter weather advisory was issued by the National Weather Service on Monday at 1:43 p.m. EST valid from 7 p.m. EST until Tuesday 7 a.m. EST for Luce County.

During the winter months, the National Weather Service often issues warnings, watches and advisories ahead of weather-related events like snowstorms. Here's what they mean.