The combination of an upper level trough of low pressure (the “U” shaped dip in the yellow line) and surface high pressure are combining to give us onshore airflow which is cool. The upper low will be replaced by high pressure that will change the airflow to offshore by midweek and that will start to warm us back up. A weak cold front will cool things off a bit Friday, but it should stay dry.

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Advisories:   NON AT THIS TIME.

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The Updated Pollen Count Forecast for the Eugene-Springfield area : Trees LOW, Grass HIGH, and weeds LOW. Data 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: Mostly clear tonight, AM clouds, sunny and warmer Wednesday, mostly clear at night, mostly sunny and a bit warmer Thursday lows 44-47 highs 85-89. Mostly sunny and cooler Friday, a bit warmer Saturday, then steady temperatures through Tuesday and mostly clear at night highs 82 Friday, 85 Saturday, and near 80 Sunday through Tuesday lows near 50. (seasonal averages high 82 low 51)

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Forecast for the Umpqua Basin including Roseburg:  Mostly clear this evening, partly cloudy tonight and Wednesday AM, sunny and warmer Wednesday afternoon, clear in the evening, then partly cloudy with patchy fog Wednesday night lows 50-55 high 87. AM clouds and patchy fog, sunny and warmer Thursday afternoon, clear Thursday night, sunny and cooler Friday, and mostly clear Friday night highs 92-85 lows 52-54. Mostly sunny Saturday through Tuesday, and mostly clear nights highs 87-84-80-82 lows 53-56. (seasonal averages high 85 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly clear this evening, partly cloudy tonight and Wednesday AM, sunny in the afternoon, becoming mostly cloudy with patchy fog late at night and Thursday morning, then sunny Thursday afternoon lows 47-53 highs 66-62. Clear Thursday evening then mostly cloudy at night and Friday morning, mostly sunny Friday afternoon, and mostly clear Friday night lows near 50 high 65. Mostly sunny Saturday and Sunday, mostly clear Saturday night, partly cloudy Sunday night through Tuesday highs 62-66 lows near 50. (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County:  Mostly clear tonight,  mostly sunny and warmer Wednesday and Thursday, while mostly clear Wednesday night free air freezing level 14,000 ft. rising to 15,000 ft. Wednesday night lows 43-50 highs 77-80. Mostly sunny Friday through Tuesday, and mostly clear at night free air freezing level  15,000 ft. Friday falling to 14,000 ft. Friday night through Sunday, 13,000 ft. Sunday night and Monday, 12,000 ft. Monday night, and 11,000 ft. Tuesday highs 79 Friday, 77 Saturday, 73 Sunday, and then back down to 70 Monday and Tuesday lows near 45.

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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.