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Here again 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 (shaded area with blue wind arrows)  is pushing lots of moisture our way to set us up for some more wet weather.  A cold front has moved through the Pacific Northwest increasing the rain again again. More frontal systems (shown Friday) will be hitting Oregon continuing this week with a much cooler air mass expected. This would be good news for the ski resorts because 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 THROUGH MIDNIGHT TONIGHT FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT ABOVE 1,500 FT. FOR THE NORTHERN AND CENTRAL COAST RANGE OF OREGON. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT ABOVE 1,500 FT. FOR THE NORTHERN OREGON CASCADE FOOTHILLS AND THE FOOTHILLS IN LANE COUNTY.  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 PM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.  A HIGH WIND WARNING IS IN EFFECT UNTIL  4 PM TODAY  FOR CENTRAL AND EASTERN LAKE COUNTY. A WIND ADVISORY IS IN EFFECT UNTIL 4 PM TODAY FOR NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE COUNTY. THERE IS A Flood Warning IN EFFECT FOR CLACKAMAS AND MARION COUNTIES.

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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 likely (60%) and isolated thunderstorms this evening, showers likely (60%) tonight (0.25 in. of rain possible, more in thunderstorms), showers likely (60%) Wednesday (0.10 in. of rain possible), mostly cloudy with a good (50%) chance of showers Wednesday night (0.10 in. of rain possible), AM clouds then a mix of clouds and sun with a good (50%) chance of showers Thursday (0.10 in. of rain possible), and a good (50%) chance of rain Thursday night (0.10 in. of rain possible) lows 35-33 highs 46-42 . Mostly cloudy with a good (50%) chance of rain Friday, and then rain likely (60%-70%) Friday  night through Tuesday highs 44-48 lows 33-38. (seasonal averages highs 45 low 33)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain and snow showers and isolated thunderstorms this evening, a good (50%) chance of snow showers late tonight (snow level 3,000 ft. falling to 2,500 ft. late) , cloudy with a good (50%) chance of rain and snow showers Wednesday (snow level 2,500 ft. falling to 2,000 ft.) and Wednesday night (snow level 2,000 ft. to 2,500 ft.), mostly cloudy with a (40%) chance of rain and snow showers Thursday (snow level 2,500 ft.), then cloudy with a (40%) of rain and snow in the evening, then rain likely (60%) late Thursday night lows 35-38 highs near 45. Mostly cloudy with AM rain likely (60%), rain and snow likely (60%) Friday afternoon and evening, rain late Friday night  rain and snow Saturday through Monday, and rain Monday night and Tuesday  highs 44-48 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 showers and isolated thunderstorms this evening,  coastal showers likely (60%) tonight, a good (50%) chance of inland showers late,  showers likely (60%) Wednesday, evening coastal showers, then then rain likely (60%) late tonight,  evening showers likely (60%) inland, then a good (50%) chance of showers Wednesday night,  cloudy with a good (50%) chance of showers Thursday, and coastal rain likely (60%) Thursday night, and a good (50%) chance of inland rain late at night lows 43-40 highs near 48. Mostly cloudy with rain likely (60%) Friday, then rain Friday night through Tuesday highs 44-48 lows near 42. (seasonal averages high 53 lows 39).

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Forecast for the Cascades of Lane County:  Mostly cloudy with snow showers and isolated thunderstorms this evening, then snow showers late tonight (9-15 in. of snow possible),  snow showers likely (60%) Wednesday (3-7 in. of snow possible), a good (50%) chance of snow showers Wednesday night, partly cloudy with a (40%) chance of snow showers Thursday, and mostly cloudy with a good (50%) chance of snow Thursday night snow level 2,500 ft. Wednesday and Thursday,  3,000 ft. Thursday night  lows near 24 highs 27-29. Mostly cloudy with a good (50%) chance of snow Friday, snow Friday night, snow and rain Saturday, snow Saturday night, then  snow likely (60%) Sunday through Tuesday snow level at the surface except 3,000 ft. Saturday highs 30-33 lows between 28-23.

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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.