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.

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Advisories: A FREEZE WARNING IS IN EFFECT FOR THE NORTHERN PART OF THE SOUTH OREGON COAST THROUGH 9  AM TODAY. A FROST ADVISORY IS IN EFFECT UNTIL 9 AM TODAY FOR SOUTHERN PART OF THE COAST (CURRY COUNTY COAST) BELOW 1,500′. AN AIR STAGNATION ADVISORY IS IN EFFECT FOR THE UMPQUA BASIN INCLUDING ROSEBURG UNTIL 4 PM SATURDAY AND FOR THE ROGUE VALLEY TO MEDFOD AND EAST TO JOSEPHINE COUNTY. AN AIR STAGNATION ADVISORY IS IN EFFECT FOR THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY UNTIL 6 PM SATURDAY. A DENSE FOG ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY.

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For the Central & Southern Willamette Valley: First of all remember 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 33 Wednesday. Mostly cloudy with AM fog then a mix of clouds and sun Today and Christmas day again the fog could linger into the afternoon, high in the upper 30s Today and about 40 Christmas day low near 26. Mostly cloudy areas of fog  Friday night  low near 30. Mostly cloudy Saturday high 44.  Mostly cloudy Saturday night through Sunday night with a slight (20%-30%) chance of rain lows near 35 high 46 . Mostly cloudy Monday through Wednesday with a (40%) chance of rain lows 34-36 and highs staying in the mid 40s.

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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 slight (20%) chance of showers high . Sunday night and Monday late night and early morning fog with freezing fog and a slight (20%) chance of showers low 32-34 high 46.  Mostly cloudy Tuesday through Wednesday with late night and early morning fog with a chance of rain and snow then a chance of rain showers in the afternoon highs in the mid 40s low in the mid 30s .

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Forecast for the South Coast: Mostly cloudy Today through Christmas day with late night and early morning fog and some freezing fog, inland will see some afternoon lingering fog high near 50 low in the low 30s. Mostly cloudy Christmas night with areas of fog low 38. Mostly cloudy Saturday through Tuesday with a chance (50% Saturday, Monday & Tuesday, 20%  Sunday night and Monday night) of rain,and Tuesday (40%) chance of rain  highs in the low 50s lows in the low 40s. Mostly cloudy Tuesday night with a (40%) chance of rain, then a (40%) chance of showers Wednesday.

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

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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.