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Here is my new weekly weather quiz question. This is a technical question. What has a “Sling Psychrometer” been used for in weather prediction? Please place your answer as a comment after the forecasts at the bottom of this page. The first person to post the correct answer will win a week of free weather personalized forecasts tailored to your needs. Good luck.

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A weak cold front is headed through Oregon. An upper level High Pressure ridge (“Arch” shaped shaded area) will build up and protect us from any storms for a while. Another large trough of low pressure (“U” shaded area over the ocean) will come in behind the ridge  by late in the week. A cold front will be moving through the Pacific Northwest Friday bringing back more wet weather. Yet another frontal system will march through on Sunday.

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Advisories:  A HIGH SURF WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 11 PM TUESDAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST.

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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 cloudy with rain this evening, rain likely (60%) tonight (0.50 in. possible), mostly cloudy Tuesday with a slight (20%) chance of AM rain, partly cloudy Tuesday night with areas of patchy fog late, early AM and late night fog then mostly sunny Wednesday and a mix of clouds and sun Thursday, partly cloudy with a  slight (20%) chance of rain Thursday night lows 50-44-47-43  highs 68-62. Mostly cloudy with rain likely (60%) Friday, mostly cloudy with a (40%) chance of rain Friday night, rain likely (60%) Saturday, then mostly cloudy with rain Saturday night, rain likely (60%) Sunday and Sunday night, and mostly cloudy with a good (50%) chance of rain Monday highs 60-53 lows 40-44. (seasonal averages highs 57 low 39)

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Forecast for the Umpqua Basin including, Roseburg: Cloudy with a (40%) chance of rain tonight with patchy fog late, cloudy with patchy fog and a slight (20%) chance of rain Tuesday AM, partly cloudy in the afternoon, mostly clear in the evening, then partly cloudy with fog late Tuesday night and Wednesday AM, sunny Wednesday, and partly cloudy with patchy fog late Wednesday night lows 55-47 highs 70-74. AM fog then partly cloudy Thursday, mostly cloudy with a (40%) of rain late Thursday night, rain likely (60%) Friday, a good (50%) chance of showers Friday night, a (40%) chance of chance of rain Saturday, mostly cloudy with rain likely (60%) Saturday night through Sunday night, mostly cloudy with a good (50%) chance of showers Monday highs 72-50 lows 48-44. (seasonal averages high 62 low 42)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Cloudy with coastal rain this evening and rain likely (60%) late at night, rain likely (60%) inland this evening and a   (60%) chance of rain, then patchy fog overnight and early Tuesday AM, a (30%) chance of AM coastal rain, a slight (20%) chance of AM rain inland, then partly cloudy in the afternoon, mostly clear with patchy fog late Tuesday night, patchy AM fog Wednesday, partly cloudy and cooler in the afternoon and evening, mostly cloudy with patchy fog late Wednesday night lows 55-49 highs 70-60. AM clouds and fog then partly cloudy  Thursday afternoon,  mostly cloudy Thursday night with a good (50%) chance of rain, mostly cloudy with rain likely (60%) Friday, a good (50%) chance of showers Friday night, a good (50%) chance of rain Saturday,  rain likely (60%) Saturday night and Sunday, showers likely (60%) Sunday night, and a good (50%) chance of showers Monday highs 60-54 lows 48-44. (seasonal averages high 60 lows 44).

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Forecast for the Cascades of Lane County:  Mostly cloudy with rain this evening, rain likely (60%) late tonight, a (30%) chance of rain Tuesday AM, a mix of clouds and sun and warmer Tuesday afternoon, and mostly clear Tuesday night, mostly sunny Wednesday, mostly clear Wednesday night, a mix of clouds and sun Thursday, and partly cloudy Thursday night snow level above 8,000 ft. tonight and Tuesday AM rising to 13,000 ft. Tuesday afternoon, a free air freezing level 13,000 ft. Tuesday night through Wednesday night, 13,000 ft. Thursday, and 12,000 ft. Thursday night lows 38-42 highs 57-62. Mostly cloudy with a (40%) chance of rain Friday and Friday night, rain likely (60%) Saturday and Saturday night, a (40%) chance of rain Sunday, a (40%) chance of rain and snow Sunday night, and mostly cloudy with a (40%) chance of rain Monday  snow level 8,000 ft. Friday, and 5,500 ft. Friday night, 5,000 ft. Saturday, and 6,500 ft. Saturday night, 5,500 ft. Sunday, 4,500 ft. Sunday night, and 5,000 ft. Monday highs 50-37 lows near 35 .

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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.