An upper level upper level High Pressure ridge (“Arch” shaped area) will strengthen and keep us dry for a little while longer. An upper level trough of low pressure (the “U” shaped  area over the Gulf of Alaska) will start changing our weather and help send a cold front our way Thursday. That’s when the rain will return.

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Advisories:  A FROST ADVISORY IS IN EFFECT FROM 2 AM TO 8 AM MONDAY FOR THE EASTERN CURRY COUNTY AND JOSEPHINE COUNTY.

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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 with patchy fog late tonight and early Monday AM and a chance of patchy frost in the outlying areas, mostly sunny Monday afternoon, partly cloudy with patchy fog again late at night and early Tuesday AM, a mix of clouds and sun in the afternoon, and partly cloudy Tuesday night with areas of fog late lows 33-36 highs 60-63. AM fog and low clouds lingering Wednesday, then a mix of clouds and sun in the afternoon, partly cloudy at night, mostly cloudy Thursday with a slight (20%) chance of rain, mostly cloudy Thursday night with a (30%) chance of rain, mostly cloudy with a slight (20%) chance of rain Friday, and mostly cloudy with a good (50%) chance of rain Friday night, and rain likely (60%) and cooler Saturday through Sunday highs 62-59 lows 38-48.(seasonal averages highs 64 low 40)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly clear tonight, Monday night,  and Tuesday night , sunny with slow warming Monday through Wednesday lows 39-42 highs 64-70. Mostly cloudy with a slight (20%) chance of  rain and cooler Thursday, a (30%) chance of Thursday night, a good (50%) chance Friday, mostly cloudy with rain likely (60%) Friday night through Saturday night, then rain Sunday highs 65-59  lows 44-50. (seasonal averages high 69 low 44)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy tonight and Monday AM with patchy late night and early AM fog, mostly sunny Monday afternoon, partly cloudy in the evening, clearing Monday night, partly cloudy Tuesday AM, sunny in the afternoon, and mostly clear Tuesday night lows 42-45 highs 62-66. Partly cloudy Wednesday, mostly cloudy with patchy fog at night, mostly cloudy with a (40%) chance of rain Thursday through Friday, rain likely (60%) chance Friday night through Saturday night, and rain and breezy Sunday highs 63-57 lows 46-50. (seasonal averages high 63 lows 46).

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Forecast for the Cascades of Lane County:  Mostly clear tonight through Tuesday night, partly cloudy Wednesday night, and mostly sunny Monday through Wednesday free  air freezing level 10,000 ft. tonight, 11,000 ft. Monday, 12,000 ft. Monday night, and 13,000 ft. Tuesday through Wednesday night lows 35-40 cooling back down to 35 Wednesday night highs 58-67. Mostly cloudy with a slight (20%) chance of rain Thursday, a (30%) chance of rain Thursday night, a slight (20%) chance of rain Friday, a good (50%) chance rain Friday night, rain likely (60%) Saturday and Saturday night, then rain or snow likely (60%) Sunday snow level above 8,000 ft Thursday and Thursday night, and  8,000 ft. Friday, 7,000 ft. Friday night through Saturday night,  falling to 5,000 ft. Sunday highs 56-45 lows 35-39.

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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.