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An upper level High Pressure ridge is building up (See the “Arch” shaped area from the Gulf of Alaska to Idaho) giving us offshore flow and warming us up even more Monday. A weak trough will swing through Northern California cooling temps. just a bit Sunday, then high pressure strengthens warming back up Monday. A trough of low pressure will develop and move toward us next week with a cold front moving through Oregon between Thursday and Friday that will be cooling us back down again. There is still smoke over the Deschutes National Forest near Sisters and could slowly move toward us due to the offshore airflow pushing the smoke from East to West because of the high pressure over us now.
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Advisories: A HEAT ADVISORY IS IN EFFECT THROUGH 9 PM MONDAY EVENING FOR ALL OF WESTERN OREGON FROM THE CASCADE FOOTHILLS WEST, EXCEPT FOR THE COAST, AND CONTINUING SOUTH TO JUST PAST COTTAGE GROVE. YOU SHOULD BE ESPECIALLY CAREFUL WHEN OUTDOORS TO DRINK PLENTY OF WATER, APPLY SUNSCREEN, AND COVER YOUR HEAD. THE ELDERLY AND INFANTS ARE PARTICULARLY SENSITIVE TO THE HEAT SO CARE SHOULD BE TAKEN. MAKE SURE YOUR OUTSIDE PETS HAVE PLENTY OF COOL WATER AND A PLACE WHERE THEY CAN GET OUT OF DIRECT SUNLIGHT.
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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 but not quite as hot Sunday (Eugene set a record high of 100 Saturday) , clear Sunday night, and Monday night , sunny and hotter agin Monday warming to near triple digits lows 50-53 highs 94-99. Mostly sunny and cooler Tuesday through Friday, and mostly clear at night highs from near 90 cooling to 79 lows 54-50. Partly cloudy Friday night and a mix of clouds and sun Saturday low 50 high 80. (seasonal averages high 82 low 51)
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Forecast for the Umpqua Basin including, Roseburg: Mostly clear tonight, Sunday night, and Monday night, mostly sunny and cooler Sunday with a slight (20%) chance of afternoon and evening thunderstorms, sunny and hot again Monday lows 55-58 highs 93-99. Mostly clear Monday night, then sunny and cooler Tuesday with a slight (20%) chance of afternoon thunderstorms, and mostly clear Tuesday night lows 60-58 high near 90. Mostly sunny Wednesday through Saturday, and mostly clear nights highs 87-83 lows near 52-55. (seasonal averages high 87 low 55)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with patchy coastal fog late tonight, becoming mostly clear inland with patchy fog late, cloudy with patchy fog at the beaches Sunday morning, partly cloudy Sunday AM inland, then sunny in the afternoon with a slight (20%) chance of isolated afternoon thunderstorms, mostly cloudy with patchy fog Sunday night and Monday at the beaches, partly cloudy in the evening inland then clearing with patchy fog late at night, sunny with patchy fog Monday AM inland, then partly cloudy in the afternoon, partly cloudy Monday night lows near 50 highs 62-64. Partly cloudy Tuesday with a slight (20%) chance of showers in the AM, partly cloudy Tuesday afternoon through through Thursday highs 60-62-60 lows 50-48. Just mostly cloudy Thursday night through Saturday lows 46-48 highs 63-60. (seasonal averages high 68 low 53).
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Forecast for the Cascades of Lane County: Clear nights through Monday night, sunny Sunday with a slight (20%) chance of afternoon and evening thunderstorms, and sunny Monday free air freezing level 16,000 ft. lows near 50 highs 85-88 . Mostly sunny and cooler Tuesday with a slight (20%) chance of afternoon and evening thunderstorms, and mostly clear at night free air freezing level 15,000 ft. high near 80 low near 48. Mostly sunny Wednesday through Saturday, and mostly clear nights free air freezing level 15,000 ft. lowering to 13,000 ft. Thursday night highs 77-70 then rising to near 80 Saturday lows 48-44.
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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.