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Here is my new weekly weather quiz question for this week. The Willamette Valley can see some pretty hot temperatures during the summer months, but the diurnal variation of temperatures is what makes it not as uncomfortable as it can get elsewhere. Explain what “diurnal” means and why does it make us more comfortable? Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.
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Advisories: A HIGH WIND WARNING IS IN EFFECT UNTIL 7 PM THIS EVENING FOR THE NORTH AND CENTRAL OREGON COAST. A HIGH SURF ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE NORTH AND CENTRAL OREGON COAST. A WINTER STORM WARNING IS IN EFFECT UNTIL 3 AM TUESDAY FOR THE COAST RANGE OF NORTHWEST OREGON. A WIND ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING FOR THE NORTH WILLAMETTE VALLEY, AND UNTIL 5 PM THIS AFTERNOON THE ENTIRE I-5 CORRIDOR FROM PORTLAND SOUTH THROUGH EUGENE AND SPRINGFIELD. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 6 PM TODAY THROUGH 6 PM TUESDAY FOR THE NORTH OREGON CASCADE FOOTHILLS, AND FROM 9 PM THIS EVENING UNTIL NOON TUESDAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 PM TUESDAY FOR THE NORTH OREGON CASCADES AND FROM 1 AM UNTIL NOON TUESDAY FOR THE CASCADES IN LANE COUNTY. A HIGH WIND WARNING IS IN EFFECT UNTIL 2 AM TUESDAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A HIGH SURF WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST AND UNTIL 11 AM TUESDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY. A WIND ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING FOR CENTRAL DOUGLAS COUNTY AND UNTIL 2 AM TUESDAY FOR JACKSON COUNTY AND UNTIL 8 AM TUESDAY FOR THE KLAMATH BASIN. A WINTER STORM WARNING IS IN EFFECT FROM 9 PM TONIGHT UNTIL 1 PM TUESDAY ABOVE 2,000 FT. CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 11 PM TONIGHT UNTIL 1 PM TUESDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL AND SOUTH OREGON CASCADES, AND THE SISKIYOUS MOUNTAINS, THE KLAMATH BASIN. A HIGH WIND WARNING IS IN EFFECT UNTIL 11 AM TUESDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY. A WIND ADVISORY IS IN EFFECT UNTIL 2 AM TUESDAY FOR JACKSON COUNTY AND UNTIL 8 AM TUESDAY FOR THE KLAMATH BASIN.
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A high pressure ridge (“Arch” shape on the yellow line) has moved eastward away from Oregon as the next trough of low pressure trough (“U” shape on the jet stream) approaches returning the clouds. A frontal system is pushing through Oregon continuing the wet weather and bringing some swift winds. Yet another frontal system (position shown for Wednesday) with others following behind it will continue the threat of rain next week.
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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 (0.75 in. of rain possible) and breezy (wind: S 20-30 mph gusts to 45 mph) tonight, AM showers, showers likely (60%) Tuesday afternoon (snow level 1,000 ft., 1 in. of snow possible above 1,000 ft., 0.25 in. of rain possible), cloudy with a good (50%) chance of showers Tuesday night (under 0.10 in. of rain possible), rain likely (60%) Wednesday (0.10 in. of rain possible), rain Wednesday night (0.15 in. of rain possible), rain Thursday, then rain likely (60%) Thursday night lows 34-42 highs 45-55. Mostly cloudy with showers likely (60%) Friday through Sunday night, then a good (50%) chance of showers (snow level 1,000 ft.) Monday highs near 49 lows 36-33. (seasonal averages high 56 low 37)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with evening rain, rain and snow (snow level 2,000 ft. late at night, 3-6 in. of snow possible, 0.75 in. of rain possible) late tonight and breezy (wind: S 15-25 mph gusts 40 mph, shifting SW 10-15 mph late tonight), AM rain and snow showers Tuesday, rain and snow showers likely (60%) in the afternoon (snow level 900 ft., 1-2 in. of snow above 1,500 ft and 1 in. of snow possible at lower elevations, 0.10 in. of rain possible), a (40%) chance of rain and snow showers Tuesday night (snow level 2,000 ft, under 0.10 in. of rain possible), partly cloudy with a (40%) chance of rain and snow Wednesday AM, rain likely (60%) in the afternoon (snow level 2,000 ft. rising to 3,000 ft. in the afternoon), mostly cloudy with rain Wednesday night through Thursday night lows 36-43 cooling to near 40 Thursday night highs 48-54. Mostly cloudy with rain Thursday and Thursday night, showers Friday, rain and snow showers Friday night, rain and snow showers likely (60%) Saturday through Sunday, then mostly cloudy with a good (50%) chance of rain and snow showers Sunday night, then a (40%) chance of rain and snow showers Monday highs 53-46 lows 38-32. (seasonal averages high 57 low 39)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with coastal rain tonight, evening rain inland, then rain and snow (snow level 2,000 ft. late, 2.00 in. of rain possible) late tonight and windy (wind S 20-30 mph gusts to 50 mph switching SW 10-15 mph late), coastal showers Tuesday AM with showers likely (60%) in the afternoon (0.20 in. of rain possible), AM rain and snow showers inland, rain and snow showers likely (60%) in the afternoon inland (snow level 900 ft., in the afternoon, 1 in. of snow possible, under 0.10 in. of rain possible), a good (50%) chance of evening coastal showers with showers likely (60%) Tuesday night and a (40%) chance of inland showers (snow level 2,000 ft., under 0.10 in. of rain possible), coastal showers likely (60%) Wednesday AM with rain in the afternoon, a good (50%) chance of inland morning rain with rain likely (60%) in the afternoon (0.10 in. of rain possible), rain Wednesday night, then mostly cloudy with rain and breezy Thursday and Thursday night lows 39-45 cooling to 42 Thursday night highs 47-53. Mostly cloudy with showers Friday and Friday night, showers likely (60%) Saturday through Sunday night, then mostly cloudy with a good (50%) chance of rain and snow showers Monday highs 50-45 lows 40-34. (seasonal averages high 54 low 41).
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Forecast for the Cascades of Lane County: Mostly cloudy with rain and snow this evening, snow (5-10 in. of snow possible, 0.75 in. of rain possible) tonight and breezy (wind: S 20-35 mph gusts to 55 mph decreasing to S 10-20 mph gusts to 35 mph late), mostly cloudy with snow showers (4-9 in. of snow possible) Tuesday, cloudy with a good (50%) chance of snow showers Tuesday night, rain and snow likely (60%) Wednesday, rain or snow Wednesday night, AM rain Thursday, rain or snow and breezy in the afternoon, then rain or snow Thursday night snow level 4,000 ft. falling to 2,500 ft. late tonight, at the surface Tuesday, 2,5,00 ft. Tuesday night, 3,500 ft. Wednesday, 5,000 ft. Wednesday night, 6,500 ft. Thursday, then 5,500 ft Thursday night lows 23-28 highs 24-20. Mostly cloudy with showers Friday, snow showers likely (60%) Friday night through Sunday night, then mostly cloudy with a good (50%) chance of snow showers Monday snow level 3,500 ft. Friday, 2,500 ft. Friday night, then at the surface Saturday through Monday highs 34-30 lows 27-20.
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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.
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Get your local Eugene-Springfield news on-line at Eugene Daily News.com.
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