Here is my weekly weather quiz question. What are “Sastrugi?” 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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As the upper level low (Shaded “U” shape with blue arrows) to the south slides away to the east a high pressure ridge (Shaded “Arch” shape with blue arrows) takes over keeping the rain away for a while. A frontal system will be sliding through the Pacific Northwest  Sunday (position shown is Monday morning), but it looks dry and should only cool us off sith a slight chance of precipitation for Mother’s Day.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

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

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Advisories:

• A FLASH FLOOD WATCH IS IN EFFECT THROUGH 11 PM TONIGHT FOR CENTRAL, WESTERN AND EASTERN LAKE COUNTY, NORTHERN AND EASTERN KLAMATH COUNTY IN SOUTH CENTRAL OREGON.

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is Allowed.

Oakridge: GREEN – Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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

• Partly cloudy this evening, clear late tonight,
• Sunny and warm Saturday, clear in the evening, increasing clouds to cloudy late Saturday night,
• Mostly cloudy with a slight (20%) chance of AM drizzle or showers, a mix of clouds and sun and a bit cooler Sunday afternoon (Mother’s Day), partly cloudy in the evening, mostly cloudy and colder late at night,
• Partly cloudy and cooler Monday and Monday night.
• lows 50-44 warming to 46 Monday night highs 76-65.
• Mostly sunny and a bit warmer Tuesday and Wednesday and Thursday,  mostly clear each night,
• Mostly sunny in the AM, then partly cloudy and a bit cooler Friday afternoon.
• highs 75-82 cooling to 75 Friday lows near 46. (seasonal averages high 65 low 42.)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (12)

Trees………. Moderate (55)

Last Counted: 5/06/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy with a slight (20%) chance of isolated evening thunderstorms (small hail possible), just mostly clear late tonight,
• Sunny and a bit warmer Saturday, mostly clear in the evening, partly cloudy with a slight (20%) chance of rain and drizzle late at night,
• Mostly cloudy with a slight (20%) chance of AM showers and a bit cooler Sunday afternoon (Mother’s Day) partly cloudy in the evening, mostly cloudy late Sunday night,
• AM clouds, mostly sunny and a bit warmer Monday afternoon, mostly clear Monday night.
• lows 53-55 cooling to 44 Sunday night and Monday night highs 82-69 cooling to 72 Monday.
• Then sunny and a bit warmer Tuesday, Wednesday, Thursday (a bit cooler) and Friday (a bit cooler), clear each night,
• highs 84-89 cooling to 80 Friday lows 49-52 cooling back to 49 Thursday night. (seasonal averages high 68 low 46).

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

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of AM coastal showers and partly cloudy Saturday afternoon while mostly cloudy inland in the AM and sunny and a bit cooler in the afternoon inland, mostly clear in the evening, mostly cloudy with patchy fog late Saturday night,
• Mostly cloudy with patchy fog and a slight (20%)  chance of AM rain and drizzle, just mostly cloudy and a bit cooler Sunday afternoon (Mother’s Day), partly cloudy in the evening, mostly cloudy late Sunday night,
• AM clouds, mostly sunny and a bit warmer Monday afternoon, then mostly clear at night.
• lows 52-54 cooling 48 Sunday night and Monday night highs 60-63.
• Then sunny and a bit warmer Tuesday, Wednesday,Thursday (a bit cooler) and Friday (a bit cooler), clear each night.
• highs 73-65 lows near 53. (seasonal averages high 58 low 46)

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late tonight,
• Mostly sunny and a bit warmer Saturday, partly cloudy and colder Saturday night,
• AM clouds, a mix of clouds and sun and a bit cooler Sunday (Mother’s Day), partly cloudy at night,
• Then partly cloudy and a bit warmer Monday and Monday night.
• snow level above 8,000 ft. tonight, free air freezing level 12,000 ft. Saturday, 13,000 ft. Saturday night,  12,000 ft. Sunday, 12,000 ft. falling to 11,000 ft. Sunday night, 11,000 ft. falling to 10,000 ft. Monday afternoon, then 10,000 ft. Monday night.
• lows 49-34 warming to 39 Monday night highs 67-54 warming to 60 Monday.
• Mostly sunny and a bit warmer Tuesday,  (cooler) Wednesday, and (warmer) Thursday, clear at night,
• Then mostly sunny and a bit cooler Friday.
• free air freezing level 10,000 ft. rising to 11,000 ft. Tuesday,11,000 ft. Tuesday night and Wednesday, 12,000 ft. Wednesday night through Thursday night, then 11,000 ft. Friday.
• highs 67-64 warming back to 67 Thursday cooling back to 64 Friday lows 38-45.

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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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