Frost Advisory issued days before possible 90-degree heat around Portland

PORTLAND, Ore. (KOIN) -- Winter isn't done with Oregon yet.

A Frost Advisory is issued for much of the Willamette Valley Wednesday morning. This comes just days before highs are expected to climb close to 90 degrees.

Summer heat is in store for much of the Pacific Northwest this week, but not with one final blast of winter-like conditions. Clearing skies late Tuesday night into Wednesday morning will help keep morning lows. Temperatures will likely fall into the 30s for much of the Willamette Valley by Thursday morning.