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.

________________

An upper level low pressure trough will slowly move to the east away from us, but in the meantime look for the chance of showers to remain with us today. High pressure (Shaded “Arch” shape with blue arrows on previous graphic) will move in and dry us out with plenty of sunshine Sunday into next week. Our next potentially weather-changing weak surface frontal system should move through the Pacific Northwest by 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.

________________

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).

________________

 

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.

________________

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

• A mix of clouds and sun with a good (50%) chance of scattered showers and a slight (20%) chance of thunderstorms today (0.10 in. of rain possible, more in storms), partly cloudy with a slight (20%) chance of showers tonight,
• Mostly cloudy Sunday AM (Father’s Day), sunny and warmer Sunday afternoon, clear at night,
• Mostly sunny Monday, mostly clear Monday night.
• highs 69-84 lows 44-53.
• AM clouds, mostly sunny and a bit cooler Tuesday afternoon, partly cloudy Tuesday night,
• Partly cloudy with a slight (20%) chance of showers Wednesday afternoon and evening, partly cloudy late Wednesday night,
• Then partly cloudy with a slight (20%) chance of showers Thursday through Friday afternoon.
• highs 74-82 lows near 52. (seasonal averages high 74 low 48).

 

_____

Eugene-Springfield Pollen Count:

Grass………. Moderate (19)

Trees………. Low (10)

Last Counted: 6/16/16

Data Courtesy of Oregon Allergy Associates.

___________________

Forecast for Roseburg:

• Partly cloudy with a slight (20%) chance of isolated AM showers,a  and a bit warmer with slight (20%) chance of isolated showers this afternoon, partly cloudy this evening, mostly clear late tonight,
• Sunny Sunday AM (Father’s Day), partly cloudy and a bit warmer in the afternoon, mostly clear at night,
• Partly cloudy in the AM, sunny and a bit warmer Monday afternoon, partly cloudy Monday night.
• highs 72-83 lows 47-54.
• Sunny in the AM, partly cloudy and a bit cooler Tuesday afternoon, partly cloudy Tuesday night through Wednesday night,
• Mostly sunny Thursday, mostly clear Thursday night,
• Then partly cloudy and a bit cooler Friday.
• highs 78-85 cooling to 83 Friday lows near 52. (seasonal averages high 76 low 52).

 

________________

 

 

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

• Partly cloudy with a slight (20%) chance of showers and isolated thunderstorms this AM (under 0.10 in. of rain possible), a bit cooler with a slight (20%) chance of isolated showers this afternoon, partly cloudy this evening, mostly clear tonight,
• Sunny Sunday and a bit warmer in the afternoon, mostly clear in the evening, mostly cloudy late Sunday night,
• Mostly cloudy Monday and at night.
• highs 62-65 cooling to 63 Monday lows 50-54.
• Mostly cloudy and a bit cooler Tuesday, then just partly cloudy Wednesday through Friday afternoon.
• highs 64-66 cooling back to 64 Friday lows near 52. (seasonal averages high 62 low 51)

 

________________

 

Forecast for the Cascades in Lane County:

• Mostly cloudy and a bit warmer with a good (50%) chance of scattered showers and thunderstorms this afternoon (0.25 in. of rain possible, more in storms), mostly cloudy with a slight (20%) chance of showers this evening, just partly cloudy late tonight,
• Then mostly sunny and a bit warmer Sunday (Father’s Day) and Monday, clear both nights.
• snow level 5,500 ft. today, 6,500 ft. tonight, free air freezing level 8,000 ft. rising to 10,000 ft. Sunday, 12,000 ft. Sunday night, then 13,000 ft. Monday and Monday night.
• highs 50-75 lows 33-46.
• Partly cloudy and a bit cooler Tuesday, and at night,
• Partly cloudy with a (30%) chance of showers Wednesday afternoon and evening, just partly cloudy late Wednesday night,
• Partly cloudy with a slight (20%) chance of showers Thursday through Friday.
• free air freezing level 13,000 ft. Tuesday and Tuesday night, then snow level above 8,000 ft. Wednesday through Friday.
• highs 69-72 cooling back to 70 Thursday and Friday lows 48-42.

________________

 

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________