An Upper level High Pressure ridge, as you can see by the shaded area off the coast and the little arrows inside,  will keep our weather dry through Christmas day. The next cold front will change the weather back to wet over the weekend. If you’re looking for a white Christmas you’ll have to look somewhere else. It’s going to be very snowy in the Midwest and the worst we’ll see is a little ice formed when fog freezes to surfaces.

__________________

Advisories:  AN AIR STAGNATION ADVISORY IS IN EFFECT FOR THE UMPQUA BASIN INCLUDING ROSEBURG UNTIL 4 PM SATURDAY AND FOR THE ROGUE VALLEY TO MEDFORD AND EAST TO JOSEPHINE COUNTY. AN AIR STAGNATION ADVISORY IS IN EFFECT FOR THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY UNTIL 6 PM SATURDAY.

__________________

For the Central & Southern Willamette Valley: A reminder that when there is fog and the temperature is below freezing freezing fog will occur producing some slippery spots on the roads. The lingering fog is why Eugene’s high temperature only reached 34 Wednesday. Mostly cloudy with lingering fog hopefully breaking out to a mix of clouds and sun Today and Christmas day high in the upper 30s Today and about 40 Christmas day low near 26. Mostly cloudy areas of fog  Friday night  low near 30. AM clouds then a mix of clouds and sun Saturday high 42.  Mostly cloudy Saturday night  with a slight (20%) chance of rain lows near 35. Mostly cloudy Saturday night through Wednesday with a (40%) chance of rain lows 34-36 and highs staying in the mid 40s.

__________________

For the Umpqua Basin including Roseburg: Today through Christmas night  partly cloudy with areas of freezing fog and some lingering afternoon fog highs in the low to mid 40s low near 30. Mostly cloudy areas of fog Saturday high 46. Mostly cloudy Saturday night with patchy fog and a slight (20%) chance of rain low in the mid 30s. Mostly cloudy Sunday with patchy AM fog  and a  (30%) chance of showers high 46. Sunday night and Monday late night and early morning fog with freezing fog and a (30%) chance of showers low 32-34 high 46.  Look for a slight (20%) chance of showers Monday evening then a slight (20%) chance of  rain and snow showers late with fog low 34. Mostly cloudy Tuesday through Wednesday with late night and early morning fog with a chance of rain and snow showers then a chance of rain showers in the afternoon (a 30% chance of showers Wednesday highs in the mid 40s low in the low 30s .

__________________

Forecast for the South Coast: Mostly sunny Today with patchy fog inland high near 50. Partly cloudy tonight for Christmas Eve, areas of evening fog inland, then some freezing fog late low in the low 30s. Mostly cloudy Christmas day with patchy fog inland again and some AM freezing high 50. Mostly cloudy with more fog late at night low in the mid 30s.  Mostly cloudy Saturday through Tuesday with a chance (20% Saturday & Saturday night, 30% Sunday through Monday night, 40% Tuesday) Mostly cloudy Tuesday through Wednesday with a (40%-50%) chance of rain highs near 50 lows near 40.

________________

For the Cascades of Lane County: Mostly sunny Today freeze level 6,000′. Mostly clear tonight freeze level at 5,000′. Christmas Day mostly sunny free air freezing level 5,000′, partly cloudy at night free air freezing level at 5,000′. A mix of clouds and sun Saturday free air freezing level holding at 5,500′. Mostly cloudy a slight (20%) chance of rain Saturday night and Sunday snow level 4,500′-3,500′. Mostly cloudy with a (40%) chance of rain  Sunday night through Wednesday, except for a 50% chance Sunday night and Monday, snow level 3,500′ to 4,000′.

_________________

Here’s my weekly weather quiz question again. Why can the mercury never drop below -40 degrees F? Please place your question as a comment on this page. The first person to answer correctly wins one week of free personalized forecasts tailored to your needs.