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Here again is my weekly weather quiz question.  A total of 3,696 people died in the United States from 1959 to 2003 due to this weather phenomenon. What is it? Please post your answer as a comment after the forecasts. 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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An upper level low over the state of Washington (see “U” shape formed by the blue arrows) is increasing the onshore air flow. That means more clouds and even a chance of some light rain along the North Oregon coast. A weak cold front will slide down from the Northwest over the weekend. Also, be prepared for  more smoke high over the area from fires in British Columbia. Smoke is collecting over the Deschutes National Forest near Sisters and could slowly move toward us when the offshore airflow returns pushing the smoke from East to West.

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Advisories: NONE AT THIS TIME.

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The summer Pollen Count Forecast season for the Eugene-Springfield area is over. From Allergy and Asthma Research Group.

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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:  Clear in the evening, then partly cloudy tonight, AM clouds then mostly sunny Friday, becoming mostly cloudy Friday night and Saturday AM, then a mix of clouds and sun and cooler in the afternoon lows 53-50 highs 82-77.  Partly cloudy in the evening, mostly cloudy at night and a slight (20%) chance of showers late Saturday night and Sunday AM, a mix of clouds and sun and cooler in the afternoon, and becoming mostly cloudy Sunday night and Monday AM, and mostly sunny and a bit warmer Monday afternoon lows 53-50 highs 74-80. Partly cloudy Monday night through Wednesday night, and a mix of clouds and sun and warmer Tuesday through Thursday lows 50-53 highs 83-86 . (seasonal averages high 83 low 51)

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Forecast for the Umpqua Basin including, Roseburg:  Clear this evening, partly cloudy tonight, AM clouds then sunny Friday and Saturday (cooler Saturday), and mostly clear Friday night lows 57-54 highs 86-82. Clear Saturday evening, then cloudy with a slight (20%) chance of light rain Saturday night and Sunday AM, sunny in the afternoon,  and mostly clear Sunday night lows near 56 highs 83-80. Mostly sunny Monday,  partly cloudy Monday night through Tuesday night, mostly cloudy Tuesday night, and AM clouds then sunny and warmer Wednesday highs 83-90 lows holding at 55. Mostly clear Wednesday night, then mostly sunny and a bit cooler Thursday low 57 high 84. (seasonal averages high 87 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Clear this evening, mostly cloudy tonight with patchy coastal fog late, AM clouds and some coastal fog, sunny Friday, mostly cloudy at the shore Friday night, becoming mostly cloudy inland, patchy fog and drizzle late at night and early Saturday AM both areas, and partly cloudy Saturday afternoon lows 53-49 highs 63-65. Cloudy Saturday night with a slight (20%) chance of light rain and drizzle, mostly cloudy Sunday with a slight (20%) chance of AM showers low near 53 highs 64. Just mostly cloudy Sunday night through Monday night, and partly cloudy Tuesday through Wednesday night, and AM clouds then partly cloudy Thursday lows near 50 highs 60-64.  (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County:  Partly cloudy with a slight (20%) chance of thunderstorms this evening, mostly sunny Friday, and partly cloudy at night free air freezing level 14,000 ft. lows near 44 high 76. A mix of clouds and sun and a bit cooler Saturday with a slight (20%) chance of afternoon showers,  mostly cloudy Saturday night and Sunday AM with a slight (20%) chance of showers, then a mix of clouds and sun and a bit cooler Sunday afternoon and partly cloudy Sunday night snow level above 8,000 ft. Saturday through Sunday highs 72- 67 low near 45. Mostly sunny with slow warming Monday through Thursday, mostly clear at night free air freezing level  between 13,000 ft. to 14,000 ft. Monday through Tuesday night falling to 12,000 ft. Wednesday through Thursday highs 73-77 lows 45-49.

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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.