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Here is my new weekly weather quiz question. One of the most important discoveries in modern Meteorology occurred during World War II. In 1944 our bombers taking part in the first raid on Japan had many of the planes run out of fuel much sooner than expected and many of them had to ditch in the ocean. What caused them to use up so much more fuel and later became one of the major tools in weather forecasting? 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. Good luck.

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The upper air flow is pushing lots of moisture our way to set us up for some more potentially heavy rain.  A cold front front is moving through the Pacific Northwest increasing the rain again as the warm front did on Saturday. More frontal systems will be hitting Oregon continuing into next week with a much cooler air mass expected for the new week. This would be good news for the ski resorts because of the milder and rainy weather we have been having will be replaced with colder temperatures, falling snow levels, and new serious mountain snow accumulations.

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Advisories: A WINTER STORM WARNING IS IN EFFECT FROM 8 PM THIS EVENING THROUGH MIDNIGHT TUESDAY NIGHT FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY. A WINTER STORM WATCH IS IN EFFECT FROM THIS EVENING THROUGH TUESDAY AFTERNOON FOR THE SOUTH CENTRAL  AND SOUTH OREGON CASCADES, AND THE SISKIYOU MOUNTAINS ABOVE 4,500 FT.  A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM TO 4 PM TUESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.  A HIGH WIND WARNING IS IN EFFECT FROM 1 AM TO 4 PM TUESDAY  FOR 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 showers this AM, showers likely (60%) then decreasing in the afternoon (0.25 in. of rain possible), rain returning tonight (o.50 in. of rain possible), showers and cooler Tuesday (0.50 in. of rain possible), then showers likely (60%) Tuesday night (0.10 in. of rain possible highs 54-43 lows 42-34. Rain likely (60%) Wednesday and Wednesday night, mostly cloudy with Thursday, then rain likely (60%) Thursday night through Sunday highs holding steady near 45 lows 33-38. (seasonal averages highs 46 low 33)

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Forecast for the Umpqua Basin including, Roseburg:  Cloudy with rain this AM, showers this afternoon, rain tonight through Tuesday AM, rain and snow showers and possible isolated thunderstorms in the afternoon (snow level 3,500 ft. falling to 2,500 ft), rain and snow showers and isolated thunderstorms Tuesday evening then rain and snow showers likely (60%) late Tuesday night (snow level 2,500 ft. falling to 2,000 ft. late at night), mostly cloudy with rain and snow showers likely (60%) Wednesday (snow level 2,000 ft. rising to 2,500 ft.), and cloudy with a (40%) chance of rain and snow Wednesday night highs 56-43 lows 42-35. Cloudy with a good (50%) chance of rain and snow Thursday, rain and snow likely (60%) Thursday night, rain Friday night through Saturday night, and rain and snow likely (60%) Sunday highs  between 45 and 50 lows near 38. (seasonal averages high 49 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with coastal AM rain today, rain likely (60%) in the afternoon, showers inland all day, rain and windy (wind: S 10-15 mph increasing SW 20-30 mph late evening and night) tonight, rain and breezy (wind: SW 20-25 mph gusts to 40 mph) Tuesday AM, showers  and isolated thunderstorms in the afternoon, evening coastal showers and and isolated thunderstorms then showers late at night, evening showers inland then showers likely (60%) late at night, showers likely (60%) Wednesday and Wednesday night highs 54-45 lows 46-40. Cloudy with AM rain likely (60%) Thursday, rain likely (60%) Thursday night, then rain Friday through Sunday highs 50-45 lows 40-43. (seasonal averages high 53 lows 39).

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Forecast for the Cascades of Lane County:  Mostly cloudy with showers today (1 in. of snow possible and 0.10 in. of rain possible), evening rain likely (60%), then and rain and snow and breezy (wind: SW 5-15 mph gusts to 30 mph increasing to SW 15-25 mph gusts to 40 mph late tonight (6-12 in. of snow possible), AM snow and and rain, afternoon showers and breezy (SW 15-25 mph gusts to 40 mph) Tuesday (10-16 in. of snow possible), snow showers Tuesday night (4-8 in. of snow possible), mostly cloudy with snow likely (60%) Wednesday AM and a good  (50%) chance of snow in the afternoon (1-4 in. of snow possible) and Wednesday night snow level 6,000 ft. falling to 5,500 ft. tonight, 4,000 ft. late tonight, 3,000 ft. falling to 2,500 ft. Tuesday afternoon, and down to the surface Tuesday night through Wednesday night highs 43-26 lows 29-20. Mostly cloudy with a good (50%) chance of snow Thursday, snow likely (60%-70%) Thursday night through Sunday snow level at the surface highs near 30 lows between 25 and 28.

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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.