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An upper level High Pressure ridge is strengthening (See the “Arch” shaped area from the Gulf of Alaska to Idaho), after a weak low pressure area snuck through cooling us down, warming us up again Monday.  A trough of low pressure will develop and move toward us mid next week with a cold front moving through Oregon between Thursday and Friday that will be  cooling us back down again.

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Advisories:  A HEAT ADVISORY REMAINS  IN EFFECT  THROUGH 9 PM MONDAY EVENING FOR THE NORTH AND CENTRAL WILLAMETTE VALLEY,  THE WESTERN COLUMBIA RIVER GORGE, THE UPPER HOOD RIVER VALLEY AND THE CASCADE FOOTHILLS OF NORTHWEST OREGON.

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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 tonight, sunny and warmer Monday, but not as warm as Saturday, (Eugene set a record high of 101 Saturday), clear Monday night, mostly sunny and cooler Tuesday through Thursday, and mostly clear Thursday night lows 52-50 highs 92-82. A mix of clouds and sun Friday, mostly clear in the evening and mostly cloudy Friday night and Saturday night, AM clouds then a mostly sunny Saturday and Sunday highs 79-77 lows near 50. (seasonal averages high 82 low 51)

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Forecast for the Umpqua Basin including, Roseburg: Mostly clear tonight with a slight (20%) chance of isolated evening thunderstorms, sunny Monday, mostly clear Monday night with a slight (20%) chance of evening thunderstorms, sunny Tuesday AM, then partly cloudy with a slight (20%) chance of afternoon and evening thunderstorms, and mostly cloudy late at night lows 60-56 highs 96-89. Partly cloudy Wednesday through Sunday highs 86-83 lows near 53-50. (seasonal averages high 86 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Cloudy at the beaches tonight, partly cloudy inland, patchy fog overnight, AM clouds then partly cloudy at the beaches, patchy AM fog then sunny in the afternoon inland Monday, partly cloudy with a slight (20%) chance of evening thunderstorms then mostly clear Monday night inland,  and just a slight (20%) chance of late night thunderstorms at the shore low 48-52 high 62. Partly cloudy Tuesday AM then mostly cloudy, a slight (20%) chance of AM drizzle and thunderstorms at the shore, sunny in the AM inland with a slight (20%) chance of AM drizzle and thunderstorms then partly cloudy Tuesday afternoon with a slight (20%) chance of thunderstorms inland, a slight (20%) chance of evening rain, then mostly cloudy late at night high 62 low near 40.  Just mostly cloudy Wednesday through Sunday highs 63-60 lows 46-48. (seasonal averages high 68 low 53).

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Forecast for the Cascades of Lane County:  Partly cloudy this evening with a slight (20%) chance of thunderstorms this evening, clear tonight, sunny Monday, and clear Monday night free air freezing level 14,000 ft. rising to 15,000 ft. Monday night lows near 50 high 85. Mostly sunny and cooler Tuesday with a slight (20%) chance of afternoon and evening thunderstorms, and mostly clear at night, mostly sunny Wednesday through Friday, and mostly clear nights free air freezing level 14,000 ft. falling to 13,000 ft. Friday highs 82-73 lows near 48. A mix of clouds and sun Saturday and Sunday, and partly cloudy Saturday night free air freezing level 11,000 ft. lowering to 10,000 ft. Saturday night highs 75-73 lows near 44.

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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.