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Aug

05.

Plenty of sunshine today, but it won’t be as hot as it was Saturday.

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Sorry, no winner this week. Here is my weekly weather quiz question for the last time. Define “Aurora Australis.” Here is the correct answer. The aurora australis (or the southern lights) is the southern counterpart and has almost identical features to the aurora borealis which is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). The charged particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth’s magnetic field into the atmosphere. Aurora is classified as diffuse or discrete aurora. Most aurorae occur in a band known as the auroral zone,^[1]^[2] which is typically 3° to 6° in latitudinal extent and at all local times or longitudes.and changes simultaneously with changes in the northern auroral zone^[7] and is visible from high southern latitudes in Antarctica, South America, New Zealand, and Australia. 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: A RED FLAG WARNING IS IN EFFECT UNTIL 5 AM MONDAY FOR ABUNDANT LIGHTNING WITH DRY FUELS FOR THE NORTH CASCADES OF OREGON, THE SOUTH CASCADES OF OREGON, SWINGING WEST THROUGH CRATER LAKE TO CAVE JUNCTION AND ALONG THE OREGON-CALIFORNIA BORDER. BE AWARE OF AREAS THAT ARE OPEN FIRE RESTRICTED AND BE ESPECIALLY CAREFUL WITH SMOKING MATERIALS.

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Curiosity, NASA’s newest Mars Science Laboratory spacecraft, will be setting down on the surface of Mars at about 10:31 PM PDT today. The event will be streamed live on the web and will be broadcast on NASA TV.

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An upper air trough of low pressure (“U” shape on the orange line) pushed eastward away from us as high pressure (“Arch” shape on the orange line) moved over us and switched the onshore airflow to offshore allowing high temperatures to increase to hot for rest of the weekend. A surface thermal though of low pressure (dashed line) has pushed eastward across Oregon bringing onshore airflow and is responsible for the cooling today away from the triple digit high temperatures.

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The pollen count for the Eugene-Springfield area is:

Grass- (barely) Moderate (5) (Observation: The grass pollen season is over.) Trees- Low (2) This report from 7/26/12, waiting for a new update.

Data from Oregon Allergy Associates www.oregonallergyassociates.com.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Partly cloudy today, partly cloudy with a slight (20%) chance of thunderstorms tonight, mostly cloudy Monday AM, mostly sunny in the afternoon, partly cloudy in the evening, mostly cloudy Monday night, a mix of clouds and sun Tuesday AM, mostly sunny in the afternoon, mostly clear in the evening, then mostly cloudy Tuesday night highs 90-86 lows 56-52. A mix of clouds and sun Wednesday, partly cloudy in the evening, mostly cloudy Wednesday night and Thursday AM, mostly sunny Thursday afternoon, partly cloudy Thursday night and Friday AM, mostly sunny Friday afternoon, mostly clear at night, then mostly sunny Saturday highs 83-80 warming to 85 Saturday lows near 52. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg: Partly cloudy with a slight (20%) chance of isolated thunderstorms this AM, mostly cloudy with a slight (20%) chance of isolated thunderstorms this afternoon and evening with gusty winds and small hail possible, mostly cloudy with a slight (20%) chance of thunderstorms late tonight, mostly cloudy Monday AM, sunny in the afternoon, mostly clear in the evening, then partly cloudy Monday night, mostly cloudy Tuesday AM, sunny in the afternoon, then partly cloudy Tuesday night highs 92-88 lows 59-56. Partly cloudy Wednesday and Wednesday evening, mostly cloudy Wednesday night and Thursday AM, mostly sunny Thursday afternoon, mostly clear in the evening, partly cloudy Thursday night and Friday AM, sunny again Friday afternoon, mostly clear Friday night, then mostly sunny Saturday highs 87-92 lows near 57. (seasonal averages high 86 low 57)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with patchy areas of patchy fog and a slight (20%) chance of isolated inland thunderstorms today with gusty winds and small hail possible this afternoon, a slight (20%) chance of isolated thunderstorms in the evening with gusty winds and small hail possible, mostly cloudy late tonight, mostly cloudy with patchy coastal fog Monday AM, partly cloudy in the afternoon and evening, then mostly cloudy Monday night, cloudy Tuesday AM, partly cloudy in the afternoon, then mostly cloudy Tuesday night highs 64-66 lows 55-52. Mostly cloudy Wednesday through Thursday night, partly cloudy Friday and Friday night, then mostly cloudy Saturday highs near 65 lows near 56. (seasonal averages high 65 low 53).

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Forecast for the Cascades of Lane County: Mostly cloudy with patchy AM fog a slight (20%) chance of isolated thunderstorms this afternoon (under 0.10 in. of rain possible), partly cloudy with a slight (20%) chance of thunderstorms late tonight through Monday evening, partly cloudy Monday night, mostly sunny Tuesday AM, partly cloudy with a slight (20%) chance of thunderstorms Tuesday afternoon and evening, just partly cloudy late Tuesday night free air freezing level 15,000 ft. today, 14,000 ft. tonight through Tuesday night highs 80-76 lows 52-46. Partly cloudy Wednesday through Thursday AM, mostly sunny Thursday afternoon, mostly clear at night, mostly sunny Friday, then partly cloudy Friday night, mostly partly cloudy in the AM, then sunny Saturday afternoon free air freezing level 14,000 ft. Wednesday and Wednesday night, then 15,000 ft. Thursday through Saturday highs 72-77 lows near 46.

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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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