Here is my weekly weather quiz question for the last time. What is “Shear?” Here is the correct answer. Shear is variation in wind speed (speed shear) and/or direction (directional shear) over a short distance within the atmosphere. Shear usually refers to vertical wind shear, i.e., the change in wind with height, but the term also is used in Doppler radar to describe changes in radial velocity over short horizontal distances. I’ll have a new weekly weather quiz question for you starting 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. Good luck.

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An upper level low pressure trough will slowly move to the east away from us. High pressure (Shaded “Arch” shape with blue arrows on previous graphic) will move in and dry us out with plenty of sunshine Sunday into early next week. Our next potentially weather-changing weak surface frontal system should move through the Pacific Northwest Thursday. The Summer Solstice occurs this Monday June 20th at 3:34 PM PDT. That is the official beginning of Summer and the Full Strawberry moon will be out too.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 26 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 in the Good category measuring Ozone.

Cottage Grove: The Air Quality Index is 24 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM SUNDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy with a slight (20%) chance of isolated showers this evening, just partly cloudy late tonight and Sunday AM (Father’s Day), mostly sunny and warmer Sunday afternoon and Monday, mostly clear both nights,
• AM clouds and sun, mostly sunny and a bit cooler Tuesday afternoon, then mostly clear Tuesday night.
• lows 44-52 highs 77-80 cooling to 75 Tuesday.
• Mostly sunny Wednesday AM, partly cloudy and a bit warmer in the afternoon, partly cloudy with a (40%) chance of showers Wednesday night,
• A mix of clouds and sun with a (40%) chance of showers Thursday, partly cloudy with a (30%) chance of evening showers, mostly cloudy with a (30%) chance of showers late Thursday night,
• A mix of clouds and sun with a (30%) chance of showers Friday, mostly cloudy with a (30%) chance of showers at night,
• AM clouds, then partly cloudy with a slight (20%) chance of showers Saturday afternoon.
• highs 74-76 lows 52-50. (seasonal averages high 74 low 48).

 

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Eugene-Springfield Pollen Count:

Grass………. Moderate (19)

Trees………. Low (10)

Last Counted: 6/16/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly clear late tonight,
• Partly cloudy and a bit warmer Sunday (Father’s Day) and in the evening, mostly clear at night,
• Sunny and a bit warmer Monday, partly cloudy Monday night,
• Mostly cloudy in the AM, sunny and a bit cooler Tuesday afternoon, then clear at night.
• lows 47-54 highs 72-83.
• AM sun, partly cloudy and a bit warmer Wednesday afternoon and evening, mostly cloudy with a (30%) chance of showers late Wednesday night,
• Partly cloudy with a slight (20%) chance of showers Thursday and Thursday night,
• Mostly sunny and a bit cooler with a (30%) chance of showers Friday, mostly clear with a (30%) chance of showers at night,
• Then sunny and a bit warmer Saturday.
• highs 78-85 cooling to 83 Friday lows near 52. (seasonal averages high 77 low 52).

 

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly clear tonight,
• Sunny Sunday AM (Father’s Day), partly cloudy and just a bit cooler in the afternoon and evening, mostly clear late Sunday night,
• Partly cloudy Monday AM, increasing clouds to mostly cloudy in the afternoon, partly cloudy at night,
• Mostly cloudy and a bit cooler Tuesday, clearing in the evening, just partly cloudy Tuesday night.
• lows 49-54 highs near 64.
• AM clouds, partly cloudy Wednesday afternoon, partly cloudy with a (30%) chance of showers Wednesday night through Thursday night,
• Partly cloudy with a (30%) chance of showers in the AM, mostly sunny with a (30%) chance of showers Friday afternoon, mostly clear with a slight (20%) chance of evening showers, mostly cloudy late Friday night and Saturday AM, then sunny in the afternoon.
• highs near 64 lows near 54. (seasonal averages high 62 low 51)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a (30%) chance of showers this evening, just partly cloudy late tonight,
• Mostly sunny and a bit warmer Sunday (Father’s Day) and Monday, mostly clear both nights,
• Partly cloudy Tuesday AM, mostly sunny and a bit cooler in the afternoon, then mostly clear late at night.
• snow level 6,500 ft. tonight, free air freezing level 8,000 ft. rising to 10,000 ft. Sunday, 12,000 ft. Sunday night, 13,000 ft. Monday through Tuesday night.
• lows 34-45 highs 68-73 cooling back to 68 Tuesday.
• Mostly sunny Wednesday AM, partly cloudy with a slight (20%) chance of showers in the  afternoon, a (40%) chance of showers Wednesday night,
• Partly cloudy with a (40%) chance of showers Thursday, a (30%) chance of evening showers, mostly cloudy with a (30%) chance of showers at night,
• A mix of clouds and sun with with a (30%) chance of showers Friday, mostly cloudy with a (30%) chance of showers Friday night,
• Then partly cloudy with a slight (20%) chance of showers Saturday.
• snow level above 8,000 ft. Wednesday through Saturday.
• highs 68-60 lows 48-40.

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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 eugenedailynews.com.

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