An upper level High Pressure ridge is still keeping our weather dry through Saturday. The next frontal system will change the weather back to wetter by Sunday. The storm center looks like it will move into the California-Oregon border. 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 DENSE FOG ADVISORY IS IN EFFECT UNTIL 10 AM FRIDAY FOR THE UMPQUA BASIN INCLUDING ROSEBURG  AND FOR EASTERN CURRY COUNTY AND JOSEPHINE AND JACKSON COUNTIES . 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 TO JOSEPHINE COUNTY. AN AIR STAGNATION ADVISORY IS IN EFFECT FOR THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY UNTIL 6 PM SATURDAY.

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For the Central & Southern Willamette Valley: A reminder that when there is fog and the temperature is below freezing freezing fog will occur and a fine mist from the fog producing some slippery spots on the roads . The lingering fog is why Eugene’s high temperature only reached 34 Wednesday and 33 Thursday. Tonight low clouds and fog and more freezing fog with some areas of clearing low in the upper 20s. Mostly cloudy with lingering fog hopefully breaking out to a mix of clouds and sun Christmas day high about 36 cooler if the fog doesn’t clear out. Mostly cloudy areas of fog Friday night  low near 30. AM clouds and fog with freezing fog then still mostly cloudy  Saturday high 42.  Mostly cloudy Saturday night with a slight (20%) chance of rain lows near 32. We could see some slippery roads where that rain freezes to the cold surfaces. Mostly cloudy Sunday with a slight (20%) chance of rain high near 45. Sunday night through Thursday  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: Tonight 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 AM fog Saturday with a slight (20%) chance of afternoon rain 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 46. Sunday night there will be a (30%) chance of showers low near 32. Monday and Monday night there will be a slight (20%) chance of showers high in the low 40s low 33-35. Look for a (40%) chance of showers Tuesday morning then a (40%) chance of afternoon showers high 46 . Mostly cloudy with a (40-50%) chance of rain or showers Tuesday night through Thursday  highs in the mid 40s low in the mid 30s .

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Forecast for the South Coast: 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 Thursday with a (40%-50%) chance of rain highs near 50 lows near 40.

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For the Cascades of Lane County: Mostly clear tonight freeze level at 8,000′. Christmas Day mostly sunny free air freezing level 8,000′, partly cloudy at night free air freezing level at 5,000?. A mix of clouds and sun Saturday free air freezing level holding at 8,000′. Mostly cloudy a slight (20%) chance of rain Saturday night and Sunday snow level 4,000′-3,500′. Mostly cloudy with a (40%) chance of rain  Sunday night through Thursday, 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.