Minor Expected Likely Frost Advisory Frost Advisory issued April 7 at 12:48AM PDT until April 8 at 9:00AM PDT by NWS Seattle WA Apr 7, 11:00 PM → Apr 8, 9:00 AM WHAT: Temperatures as low as 32 to 36 will result in frostformation. WHERE: Middle Chehalis River Valley, Foothills and Valleys ofThurston and Lewis Counties, Lowlands of Lewis and SouthernThurston Counties, Olympia and Southern Puget Sound, and Willapaand Black Hills. WHEN: From 11 PM this evening to 9 AM PDT Wednesday. IMPACTS: Frost could harm sensitive outdoor vegetation. Sensitiveoutdoor plants may be killed if left uncovered. + Read More Take steps now to protect tender plants from the cold. Updated: Apr 7, 6:18 AM Source: NWS Alert