timchueyweather4u.com
Tim Chuey Weather
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Here is my weekly weather quiz question. This is your last chance to win this week. Define “Aurora Australis.” 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 HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 9 PM SATURDAY FOR THE NORTH AND CENTRAL OREGON COAST, THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE I-5 CORRIDOR FROM PORTLAND THROUGH EUGENE/SPRINGFIELD AND WEST TO FLORENCE AND SOUTH TO COTTAGE GROVE, THE WESTERN COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY.

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An upper air trough of low pressure (“U” shape on the orange line) is pushing eastward as high pressure (“Arch” shape on the orange line) moves over us and switches the onshore airflow to offshore allowing high temperatures to increase to hot for the weekend. A thermal trough of low pressure will stay over the coast and coast range mountains aiding the warming process and helping to produce thunderstorms as it moves to the east.
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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: Clear tonight, sunny and hot Saturday, mostly clear Saturday night, mostly sunny Sunday AM, partly cloudy and still very warm in the afternoon, partly cloudy with a slight (20%) chance of  thunderstorms Sunday night, mostly cloudy Monday AM, mostly sunny in the afternoon, mostly clear in the evening, then mostly cloudy Monday night lows 53-58 cooling to 55 Monday night highs 98-88. Mostly cloudy Tuesday AM, mostly sunny in the afternoon, partly cloudy in the evening, mostly cloudy Tuesday night and Wednesday AM, partly cloudy Wednesday afternoon and evening, mostly cloudy Wednesday night and Thursday AM, then mostly sunny Thursday afternoon, partly cloudy Thursday night and Friday AM, then mostly sunny Friday afternoon highs 83-80 warming to 83 Friday lows near 52. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg: Clear tonight, sunny and hot Saturday, partly cloudy with a slight (20%) chance of thunderstorms late Saturday night, mostly cloudy with a slight (20%) chance of isolated thunderstorms Sunday, partly cloudy with a slight (20%) chance of thunderstorms in the evening, then partly cloudy late Sunday night through Monday night lows 58-65 cooling to 56 Monday night highs 99-86. Partly cloudy Tuesday through 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, then sunny again Friday afternoon highs 84-88 cooling to 83 Thursday lows 56-54. (seasonal averages high 86 low 57)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly clear this evening, partly cloudy with patchy coastal fog tonight and Saturday AM, sunny in the afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of inland thunderstorms Saturday night with a slight (20%) chance of coastal thunderstorms late Saturday night, mostly cloudy with patchy fog and a slight (20%) chance of AM coastal thunderstorms Sunday with isolated inland thunderstorms in the afternoon and evening, then mostly cloudy Sunday night through Monday night lows 56-54 highs 74-63. Mostly cloudy Tuesday through Friday AM, then sunny Friday afternoon highs 64-67 lows near 55. (seasonal averages high 65 low 53).

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Forecast for the Cascades of Lane County: Clear tonight, sunny and warmer Saturday, partly cloudy Saturday night, mostly sunny Sunday AM, a mix of clouds and sun with a slight (20%) chance of thunderstorms Sunday afternoon and evening, partly cloudy with a slight (20%) chance of thunderstorms Sunday night, then partly cloudy Monday and Monday night free air freezing level 16,000 ft. tonight and Saturday, 15,000 ft. Saturday night and Sunday, 14,000 ft. Sunday night through Monday night lows 52-55 cooling to 46 Monday night highs 85-76. Mostly sunny Tuesday AM, partly cloudy in the afternoon, partly cloudy with a slight (20%) chance of showers late Tuesday night and Wednesday AM,  partly cloudy in the afternoon and Wednesday night, then mostly sunny Thursday and Friday with mostly clear skies Thursday night free air freezing level 14,000 ft. Tuesday through Friday highs 75-70 warming to 74 Friday 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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Get your local Eugene-Springfield news on-line at Eugene Daily News.com

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