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Check out my latest Eugene Daily News Weather Or Not Column That Pioneer Spirit Still Lives Within Us. Where To Next?
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No winner this week. Here is my weekly weather quiz question for the last time. What is the difference between the “Visible” satellite view and the “Enhanced Infrared” satellite view? Also, how does that difference help forecast the weather over Western Oregon? Here are the correct answers. Visible Satellite Imagery uses reflected sunlight (this is actually reflected solar radiation) to see things in the atmosphere and on the Earth’s surface. Clouds and fresh snow are excellent reflectors, so they appear white on the imagery. Clouds can be distinguished from snow, because clouds move and snow does not move. Meanwhile, the ground reflects less sunlight, so it appears black on the imagery. The satellite uses its 0.55 to 0.75 micrometer (um) channel to detect this reflected sunlight. Since this imagery relies on reflected imagery, it cannot be used during night. Infrared Satellite Imagery senses surface and cloud top temperatures by measuring the wavelength of electromagnetic radiation emitted from these objects. This energy is called “infrared”. High clouds are very cold, so they appear white. Mid-level clouds are somewhat warmer, so they will be a light gray shade. Low cloud are warmer still, so they appear as a dark shade of gray or black. Often, low clouds are the same temperature as the surrounding terrain and cannot be distinguished at all. The satellite picks up this infrared energy between 10.5 and 12.6 micrometer (um) channels. I’ll have a new weekly weather quiz question for you Monday. The Visible Satellite image also picks up the low clouds and dense fog that can get stuck in the South Willamette Valley so comparing the two satellite views can help determine if the fog and low clouds are dissipating. 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. Good luck.
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ADVISORIES:
A NEW Blue-Green Algae warning has been issued for Tenmile Lakes in Coos County. A Blue-Green Algae warning has been lifted for Walterville Pond, Dorena Reservoir and Dexter Reservoir, but continues for Fern Ridge Reservoir and at Devils Lake. Water monitoring has confirmed the presence of blue-green algae that can produce toxins, state public health officials said. The algae levels are likely associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals. Swallowing or inhaling water droplets, as well as skin contact with water, should be avoided according to the authorities.
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An upper level low will be moving over us bringing back the chance of showers. A frontal system will slide into the Pacific Northwest enhancing the chance of showers.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy this evening, clouds increasing to mostly cloudy with a slight (20%) chance of rain developing late, rain likely (60%) very late tonight (under 0.10 in. of rain possible).
- Mostly cloudy with AM showers likely (60%), a good (50%) chance of showers and cooler Monday afternoon (0.10 in. of rain possible), partly cloudy with a (40%) chance of evening showers, a slight (20%) chance of showers late Monday night (under 0.10 in. of rain possible),
- Mostly cloudy with a good (50%) chance of showers Tuesday AM, showers likely (60%) in the afternoon (0.10 in. of rain possible), partly cloudy with patchy fog and a slight (20%) chance of showers late Tuesday night (under 0.10 in. of rain possible),
- Partly cloudy with patchy fog Wednesday AM, mostly sunny in the afternoon, then pertly cloudy Wednesday night,
- lows 45-35 warming to 42 Wednesday highs 62-56 warming to 62 Wednesday.
- Partly cloudy with a slight (20%) chance of showers Thursday, partly cloudy at night,
- A mix of clouds and sun with a slight (20%) chance of showers Friday, Saturday and Sunday while partly cloudy with a slight (20% ) chance of showers Friday night and Saturday night.
- highs near 60 lows 45-42. (seasonal averages high 69 low 43)
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Forecast for the Umpqua Basin including Roseburg:
- Clear this evening, mostly cloudy with a good (50%) chance of rain late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with a (40%) chance of rain Monday (under 0.10 in. of rain possible), mostly cloudy with a (40%) chance of showers Monday evening (under 0.10 in. of rain possible).
- A (40%) chance of showers Tuesday (under 0.10 in. of rain possible), a (30%) chance of showers Tuesday night (under 0.10 in. of rain possible),
- Then just partly cloudy Wednesday and Wednesday night.
- lows 40-49 cooling to 46 Wednesday night highs 72-60.
- Partly cloudy Thursday through Friday night,
- Partly cloudy with a slight (20%) chance of showers Saturday and Saturday night,
- Then just mostly cloudy Sunday.
- highs 63-67 lows 45-49. (seasonal averages high 71 low 46)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:
- Mostly cloudy with a slight (20%) chance of coastal rain this evening and rain tonight while mostly clear inland this evening then mostly cloudy with rain likely (60%) late tonight (under 0.10 in. of rain possible),
- Mostly cloudy Monday with coastal rain likely (60%) while a good (50%) chance of rain inland, a (40%) chance of showers Monday evening (under 0.10 in. of rain possible).
- Mostly cloudy with a (40%) chance of showers Tuesday (under 0.10 in. of rain possible), a (40%) chance of showers Tuesday night (under 0.10 in. of rain possible).
- Just partly cloudy Wednesday and Wednesday night.
- lows 52-44 warming to 47 Wednesday night highs 62-59.
- Partly cloudy Thursday through Friday night,
- Partly cloudy with a slight (20%) chance of showers Saturday and Saturday night,
- Then mostly cloudy with a slight (20%) chance of showers Sunday.
- highs 60-65 lows near 48. (seasonal averages high 62 low 47)
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Forecast for the Cascades of Lane County:
- Partly cloudy through late this evening, becoming cloudy with a slight (20%) chance of rain late tonight (0.10 in. of rain possible)
- Mostly cloudy with a good (50%) chance of showers and cooler Monday (0.10 in. of rain possible), a (40%) of rain and snow showers Monday night.
- Mostly cloudy with a good (50%) chance of showers Tuesday, then a (30%) chance of showers Tuesday night,
- Mostly sunny Wednesday, then partly cloudy at night.
- snow level above 7,500 ft. tonight, 6,500 ft. Monday, 6,000 ft. falling to 5,000 ft. Monday night, 4,500 ft. Tuesday, 4,000 ft. Tuesday night, free air freezing level 5,000 ft. rising to 6,500 ft. Wednesday, then 7,500 ft. Wednesday night.
- lows 35-25 warming to 33 Wednesday highs 46-38 warming to 45 Wednesday.
- Party cloudy with a slight (20%) chance of showers Thursday and Thursday night,
- A mix of clouds and sun with a slight (20%) chance of showers Friday, partly cloudy with a slight (20%) chance of showers Friday night through Saturday night,
- Then a mix of clouds and sun with a slight (20%) chance of showers Sunday.
- snow level 7,000 ft. Thursday through Friday, 8,000 ft. Friday night, 7,000 ft. Saturday, then 7,500 ft. Sunday.
- highs 48-53 lows near 36.
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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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Get your local Eugene-Springfield and Lane County news on-line at Eugene Daily News.com.
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