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Jul

18.

More scattered showers and thunderstorms today continuing through Thursday. Starting Friday sunny and warmer weather will return.

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Here is my weekly weather quiz question. What is the “free air freezing level” we refer to in the Cascades weather forecasts? Please define what it is. 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: NONE AT THIS TIME.

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A closed low (brown circle) slid south from Canada through Oregon on to the California/Oregon border, where it will stay a while, and then migrate north and east tomorrow as it continues to bring us more clouds and the chance of showers or thunderstorms as it rotates the air around it from southeast to northwest. A weak cold front will slide though Saturday with clearing skies and warmer temperatures behind it. We will dry out and warm up as we head into the weekend and next week.

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The pollen count for the Eugene-Springfield area is:

Grass- Moderate (5) (Observation: It looks like the grass pollen season is just about over, since grass is just barely in the moderate category, by 1.)

Trees- Low (5)

Data from Oregon Allergy Associates www.oregonallergyassociates.com.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with a (30%) chance of showers this AM, a mix of clouds and sun with a slight (20%) chance of showers this afternoon and evening (under 0.10 in. of rain possible), partly cloudy tonight, partly cloudy with a slight (20%) chance of thunderstorms Thursday afternoon (under 0.10 in. of rain possible), a slight (20%) chance of showers Thursday night (under 0.10 in. of rain possible) and Friday AM, then just partly cloudy Friday afternoon and Friday night highs 75-82 lows 55-52. Mostly sunny Saturday, Sunday, Monday, and Tuesday with mostly clear nights highs 82-85 lows 50-54. (seasonal averages high 83 low 52)

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms this AM, scattered showers and a (30%) chance of afternoon thunderstorms (under 0.10 in. of rain possible, more in storms), partly cloudy with a slight (20%) chance of scattered thunderstorms this evening, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms), mostly cloudy Thursday AM, partly cloudy with a (30%) chance of scattered showers and thunderstorms Thursday afternoon (under 0.10 in. of rain possible, more in storms) and Thursday night (under 0.10 in. of rain possible, more in storms), a slight (20%) chance of showers Friday AM, mostly sunny Friday afternoon, then mostly clear Friday night highs 76-82 lows near 56. Mostly sunny Saturday, mostly clear Saturday night, then mostly sunny Sunday through Tuesday with mostly clear nights highs 88-90 lows near 56. (seasonal averages high 85 low 57)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a (30%) chance of thunderstorms this AM, isolated coastal showers with a (30%) chance of inland showers and a slight (20%) chance of thunderstorms this afternoon (under 0.10 in. of rain possible, more in storms), a (30%) chance of coastal showers with a (30%) chance of scattered inland thunderstorms this evening and a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms), mostly cloudy with a slight (20%) chance of coastal showers and a (30%) chance of inland thunderstorms Thursday afternoon, a slight (20%) chance of evening coastal showers and isolated evening inland thunderstorms, then partly cloudy Thursday with a slight (20%) chance of showers late Thursday night, partly cloudy Friday AM, mostly sunny in the afternoon, then partly cloudy Friday night highs 65-62 lows near 54. Partly cloudy Saturday, mostly clear Saturday night, mostly sunny Sunday and Monday, then partly cloudy Monday night and Tuesday highs 70-63 lows near 53. (seasonal averages high 65 low 53).

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Forecast for the Cascades of Lane County: A mix of clouds and sun today with a good (50%) chance of showers and a slight (20%) chance of thunderstorms this AM, a slight (20%) chance of thunderstorms this afternoon and evening (0.10 in. of rain possible, more in storms), a (40%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms) and Thursday AM, partly cloudy with a (30%) chance of thunderstorms Thursday afternoon (0.25 in. of rain possible, more in storms) and Thursday evening, a (30%) chance of showers late Thursday night and Friday AM, then partly cloudy Friday afternoon and Friday night snow level above 8,000 ft. today through Friday, then free air freezing level 11,000 ft. Friday night highs 66-69 lows near 46. Mostly sunny Saturday through Tuesday with mostly clear skies at night free air freezing level 13,000 ft. Saturday through Monday, then 14,000 ft. Monday night and Tuesday highs 72-75 lows 44-48.

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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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