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Another  trough of low pressure is moving through Oregon  (See “U” shape ) behind the high pressure ridge  (See “Arch” shape”) that kept us hot and dry, then  a cold front (map shows front moving down from the Gulf of Alaska) will be moving through OregonThursday to bring temperatures back down again, way down.

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Advisories:  A RED FLAG WARNING IS IN EFFECT UNTIL 8 PM THIS EVENING FOR THE I-5 CORRIDOR FROM THE WASHINGTON BORDER TO SOUTH OF COTTAGE GROVE EASTWARD THROUGH THE CASCADES FOR HIGH HEAT, HIGH WINDS , AND VERY LOW RELATIVE HUMIDITIES. ALL OF THOSE FACTORS COMBINE TO CREATE A SERIOUS FIRE DANGER. BE VERY CAREFUL WITH COMBUSTIBLE MATERIALS IN THE AFFECTED AREAS.

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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 this evening and partly cloudy tonight, mostly cloudy Thursday with with a slight (20%) chance of AM drizzle, then a slight (20%) chance of showers in the afternoon, mostly cloudy at night and Friday AM, then a mix of clouds and sun and cooler Friday afternoon, partly cloudy in the evening, and mostly cloudy with a slight (20%) chance of showers late Friday night lows 53-45 highs 75-70. AM clouds then a mix of clouds and sun Saturday with a slight (20%) chance of showers, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night high 70 low 48. AM clouds then a mix of clouds and sun with a slight (20%) chance of showers Sunday and Monday, partly cloudy to mostly cloudy at night with a slight (20%) chance of showers, partly cloudy with a slight (20%) chance of showers Monday evening, highs 70-73 lows 48-52. A mix of clouds and sun and warmer Tuesday and Wednesday, and partly cloudy Tuesday night highs 75-80 low 53. (seasonal averages high 81 low 50)

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Forecast for the Umpqua Basin including, Roseburg: Clear this evening, then mostly cloudy with a slight (20%) chance of rain late tonight and Thursday AM, partly cloudy and cooler in the afternoon and evening, then mostly cloudy and cooler Thursday night, AM clouds then sunny and cooler Friday, mostly clear in the evening, then mostly cloudy with a slight (20%) chance of showers Friday night lows 57-48 highs 75-72. Mostly cloudy with a slight (20%) chance of showers and warmer Saturday through Monday night, then just mostly cloudy Tuesday through Wednesday highs 72-80 Monday, 76 Tuesday and back up to 85 Wednesday lows 50-53. (seasonal averages high 86 low 54)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Becoming mostly cloudy with patchy coastal fog and a slight (20%) chance of rain late tonight, mostly cloudy with patchy coastal fog Thursday AM with a slight (20%) chance of rain, partly cloudy in the afternoon, mostly cloudy with patchy coastal fog late Thursday night lows 55-50 high 62. AM clouds and coastal fog Friday then sunny and warmer in the afternoon, becoming mostly cloudy with a slight (20%) chance of showers Friday night through Monday night highs 64-60 warming to 65 Monday lows near 50. Patchy AM coastal fog then mostly cloudy Tuesday, just mostly cloudy Tuesday night and cooler Wednesday highs 66-63 lows near 50. (seasonal averages high 68 low 53).

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Forecast for the Cascades of Lane County:  Mostly clear and cooler tonight, a mix of clouds and sun Thursday with a slight (20%) chance of afternoon and evening showers, then mostly cloudy and colder Thursday night free air freezing level 16,000 ft. today, and 15,000 ft. tonight, snow level above 8,000 ft. and back to a free air freezing level late Thursday night  lows 46-39 high 65. AM clouds then a mix of clouds and sun Friday, becoming mostly cloudy with a slight (20%) chance of showers late Friday night and Saturday AM, a mix of clouds and sun Saturday with a slight (20%) chance of showers, partly cloudy in the evening, then mostly cloudy with a slight (20%) chance of showers at night free air freezing level 9,000 ft. Friday, snow level 8,000 ft. Friday night, and 7,000 ft. Saturday and Saturday night highs 61-56 lows near 38. Mostly cloudy  with a slight (20%) chance of showers Sunday through Monday evening, mostly cloudy Monday night and Tuesday AM, then a mix of clouds and sun and warmer Tuesday and Wednesday, and partly cloudy Tuesday night  snow level 7,000 ft. Sunday, 8,000 ft. Sunday night  through Monday night, and a free air freezing level 12,000 ft. Tuesday, 14,000 ft. at night, and 15,000 ft. Wednesday  highs 58-66 lows 39-45.

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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.