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Here is my new weekly weather quiz question. What is the difference between Doppler Radar and the older generation radar? Please post your answer as a comment after the forecasts on this page. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.
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The upper air flow (yellow jet stream and dark colors for winds) shows a trough of low pressure a (“U” shape offshore) sliding Eastward into the coast as a frontal system moved slowly through the Pacific Northwest. Notice that the jet stream airflow moves so that it brings the colder air from the north and northwest today through the end of the week into New Years Day.
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FLOOD WARNINGS ARE IN EFFECT FOR PARTS OF WESTERN OREGON:
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Advisories: A WINTER STORM WARNING IS IN EFFECT FROM UNTIL 4 PM TODAY FOR THE NORTH CASCADE FOOTHILLS AND THE FOOTHILLS OF LANE COUNTY AND CONTINUING UNTIL 4 PM WEDNESDAY FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM UNTIL 4 PM TODAY FOR THE COAST RANGE OF NORTHWEST OREGON AND THE CENTRAL COAST RANGE, AND FOR THE I-5 CORRIDOR FROM PORTLAND SOUTH THROUGH EUGENE, AND THE WESTERN COLUMBIA RIVER GORGE, AND THE UPPER HOOD RIVER VALLEY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 PM TODAY FOR THE SOUTH CENTRAL AND SOUTH CASCADES AND THE SISKIYOU MOUNTAINS OF OREGON. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 PM THURSDAY ABOVE 1,500 FT. FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST, CENTRAL DOUGLAS COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 3 PM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL AND EASTERN LAKE COUNTY.
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Here are your detailed forecasts. **
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with rain and snow showers likely (60%) today (snow level above 800 ft. 1-2 in. of snow possible), a good (50%) chance of rain and snow showers tonight (snow level 500 ft. to 1,000 ft. this evening with little or no snow accumulation), AM clouds with a (40%) chance of snow showers, a mix of clouds and sun Thursday afternoon, partly cloudy Thursday night, a mix of clouds and sun Friday, and mostly clear Friday night (New Years Eve), highs 42-40 lows 32-25 . A mix of clouds and sun Saturday (New Years Day), partly cloudy Saturday night, a mix of clouds and sun Sunday, mostly cloudy with a (30%-40%) chance of rain Sunday night through Tuesday highs 42-47 lows 28-32. (seasonal averages highs 45 low 32)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with rain and snow showers today and tonight (snow level above 1,500 ft. today and 1,000 ft. falling to 500 ft. late at night, 1 in. of snow today lower elevations 3-4 in. of snow above 1,500 ft. and 1-2 in. tonight), cloudy with rain and snow showers likely (60%) Thursday AM, a good (50%) chance of rain and snow showers in the afternoon (snow level 500 ft. rising to 1,500 ft.), mostly cloudy with a slight (20%) chance of evening rain and snow, then patchy fog and freezing fog Thursday night and Friday AM, a slight (20%) chance of rain Friday afternoon (snow level 1,500 ft.), then a (30%) chance of rain and snow Friday night lows 33-27 highs 40-43. Mostly cloudy with a (40%) chance of rain and snow showers Saturday (New Years Day) and Saturday night, a slight (20%-30%) chance of rain and snow showers Sunday and Sunday night, and mostly cloudy with a (40%) chance of rain Monday through Tuesday highs 42-46 lows near 33-36. (seasonal averages high 48 low 34)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with coastal showers with rain and snow showers inland (snow level 1,500 ft. falling to 1,000 ft. 1 in. of snow possible ) today and breezy (wind: NW 15-25 mph), coastal showers with rain and snow showers inland (snow level 1,000 ft.) tonight (snow level 1,000 ft. 1 in. of snow possible), AM coastal showers likely (60%) Thursday, then a good (50%) chance of afternoon showers with AM rain and snow showers likely (60%) inland and a good (50%) chance of afternoon rain and snow showers (snow level 1,000 ft. rising to 1,500 ft.), then a slight (20%) chance of coastal evening showers with patchy fog late Thursday night and a slight (20%) chance of inland rain with patchy fog and freezing fog (snow level 1,500 ft. in the evening) highs near 45 lows 38-34 . AM patchy fog, then mostly cloudy with a slight (20%) chance of rain Friday, a (40%) chance of rain Friday night (New Years Eve), a (40%) chance of showers Saturday (New Years Day), a (30%) chance of showers Saturday night and Sunday, then mostly cloudy with a (40%) chance of rain Sunday night through Tuesday highs 44-49 lows near 36-43. (seasonal averages high 52 lows 39).
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Forecast for the Cascades of Lane County: Cloudy with snow showers and colder today (8-16 in. of snow possible) breezy (wind: W 15-25 mph), snow showers likely (60%) decreasing late tonight (1-4 in. of snow possible), a (40%) chance of snow showers Thursday AM, a slight (20%) chance of afternoon snow showers, then becoming mostly clear Thursday night, mostly sunny Friday, mostly clear Friday night (New Years Eve) snow level at the surface today through Thursday, free air freezing level at the surface Thursday night through Friday night highs 21-30 lows 14-20. A mix of clouds and sun Saturday (New Years Day), partly cloudy Saturday night, a mix of clouds and sun again Sunday, mostly cloudy with a slight (20%) chance of snow Sunday night, mostly cloudy with a (30%) chance of snow Monday, then a (40%) chance of rain or snow Monday night and Tuesday free air freezing level 2,500 ft. Saturday and Saturday night and 2,000 ft. Sunday, snow level 3,000 ft. Monday night rising to 5,500 ft. Tuesday highs 30-35 lows 18-23.
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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.