METEOROLOGIST MARISA WOLOSZYN’S FORECAST DISCUSSION:
High pressure is still in control of our weather, keeping things dry for yet another Sunday. Everywhere except the Willamette Valley saw another day of sun with highs in the mid 40s. A large temperature inversion is the culprit to keeping the fog in the valley. Cold air exists from the surface to around 1000 ft, above this level is warm air. The warm air acts as a lid (because it is less dense than cold air) and keeps the cold air and fog trapped below.
High pressure remains in control for Monday and Tuesday, keeping the forecast consistent. Everywhere but the valley will continue to see sunshine with highs in the low to mid 40s. The communities in the Willamette Valley will keep the fog all day with highs in the low to mid 30s.
The next system moves in Tuesday night into Wednesday. Precipitation will start off as freezing rain in the valley Tuesday night, which may cause some slicks spots for Wednesday’s commute. Communities below 3000′ can expect rain; but above the snow line, areas can expect about 1 inch of new snow.
Dry weather return Thursday and Friday as a small ridge builds, but rain and snow returns next weekend.
Have a magnificent Monday!
Meteorologist Marisa Woloszyn