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May

19.

More clouds are rolling in so we won’t see much sky tonight and Sunday. The rain chance should hold off until late Sunday afternoon or evening.

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Sorry, but no winner this week. Here’s my weekly weather quiz question for the last time this week. This week’s question is: what is the “Heat Index” and why is it important to know what it is? Here is the answer. The heat index (see chart below) is the “feels like”, or apparent, temperature. As relative humidity increases, the air seems warmer than it actually is because the body is less able to cool itself via evaporation of perspiration. As the heat index rises, so do health risks. When the heat index is 90°-105°F, heat exhaustion is possible. When it is above 105°F, it is probable. Heatstroke is possible when the heat index is above 105°F, and very likely when it is 130°F and above. Physical activity and prolonged exposure to the heat increase the risks.For more details and a heat index chart go to: this address . I’ll have another weekly weather quiz question for you starting next Monday. Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count.

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Advisories: NONE AT THIS TIME.

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A high pressure ridge (“Arch” shape on both lines) has brought sunshine and warmer temperatures to the Pacific Northwest, but an upper air trough of low pressure (“U” shape on orange line) will increase onshore airflow bringing in some more clouds and slight chances for rain beginning by late Sunday. The chance of rain will sneak in late Sunday night as more frontal systems head our way. For you skywatchers there will be an annular eclipse of the Sun on Sunday evening. Western Oregon is off the path of best viewing, but you should be able to see the moon, as long as the thicker clouds don’t move in first, covering most of the Sun with a bigger area of sun visible at the top curve of the moon. For viewing instructions go to this address . Look for lots of clouds tonight and Sunday with a slight chance of rain Sunday evening and night in Florence for the 105th Rhododendron Festival. For more details concerning the rest of the weekend’s events go to: Rhododendron Festival calendar from the Florence Chamber of Commerce.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy tonight, mostly cloudy with a slight (20%) chance of rain Sunday afternoon and Sunday night, cloudy with a good (50%) chance of rain Monday AM, rain likely (60%) in the afternoon, a good (50%) chance of showers Monday night, a (40%) chance of showers Tuesday, then mostly cloudy with a (30%) chance of rain Tuesday night lows 45-50 cooling to 45 Tuesday night highs 72-62. Mostly cloudy with a (40%) chance of showers Wednesday, a (30%) chance of showers Wednesday night, mostly cloudy with a slight (20%) chance of rain Thursday, mostly cloudy with a (30%) chance of showers Thursday night through Friday night, then a mix of clouds and sun with a (30%) chance of showers Saturday highs 63-66 lows near 46. (seasonal averages high 68 low 44)

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy tonight and Sunday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Sunday night, cloudy and cooler with a (30%) chance of rain Monday AM, showers likely (60%) in the afternoon and evening, a (30%) chance of showers late Monday night, then mostly cloudy with a (30%) chance of showers Tuesday and Tuesday night lows 46-52 cooling to 45 Tuesday night highs 76-66. Mostly cloudy with a (40%) chance of showers Wednesday through Thursday, then a (30%) chance of showers Saturday highs 65-69 cooling to 64 Saturday lows 46-48. (seasonal averages high 71 low 48)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy tonight and Sunday, partly cloudy in the evening, cloudy with a slight (20%) chance of showers late Sunday night, rain likely (60%) Monday AM, showers in the afternoon, showers likely (60%) Monday evening, a good (50%) chance of showers late Monday night, then mostly cloudy with a (40%) chance of showers Tuesday, and (30%) Tuesday night lows 46-52 highs near 59. Mostly cloudy with a (30%) chance of showers Wednesday through Thursday night, then a (40%) chance of showers Friday through Saturday highs near 58 lows near 47. (seasonal averages high 59 low 48).

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Forecast for the Cascades of Lane County: Mostly cloudy tonight, mostly cloudy with a slight (20%) chance of rain Sunday and Sunday night, mostly cloudy with rain likely (60%) Monday, showers likely (60%) in the evening, a (%) chance of showers Monday night, then mostly cloudy with a good (50%) chance of showers Tuesday and Tuesday night free air freezing 10,000 ft. tonight, snow level above 8,000 ft. Sunday and Sunday night, 8,000 ft. Monday, 7,500 ft. Monday night, 5,000 ft. Tuesday, then 5,500 ft. Tuesday night lows 35-39 cooling to 35 Tuesday night highs 65-46. Mostly cloudy with a (40%) chance of showers Wednesday, partly cloudy with a good (50%) chance of rain and snow showers Wednesday night through Thursday night, mostly cloudy with a good (50%) chance of showers Friday, a (40%) chance of rain and snow showers Friday night, then mostly cloudy with a good (50%) chance of showers Saturday snow level 5,500 ft. Wednesday, 5,000 ft. Wednesday night, 4,500 ft. Thursday, 5,000 ft. Thursday night, 5,500 ft. Friday and Friday night highs 52-60 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.

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