Check out my latest Eugene Daily News Weather Or Not column:
http://eugenedailynews.com/2018/04/heres-a-new-one-have-you-ever-heard-of-a-dirty-thunderstorm/
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Here is my weekly weather quiz question for the last time. What is a “Downburst?” Here is the correct answer. A Downburst is a strong downdraft current of air from a cumulonimbus cloud, often associated with intense thunderstorms. Downdrafts may produce damaging winds at the surface. I’ll have a new weekly weather quiz question for you starting Monday. The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs. Good luck.
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An Upper Level High Pressure Ridge (Shaded “Arch” shape with arrows) weakened enough to allow onshore flow which brought us more clouds, some showers, and thunderstorms. Now that ridge strengthens once again. The graphics for days 1-3 show a surface low moving over Oregon. The graphics for days 3-7 show the frontal system that moves through Tuesday night into Wednesday, then another frontal system pushes through Thursday. Yet another frontal system will move in by next Sunday night into Monday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 27 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 22 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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Advisories:
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE RIVER.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy this evening, mostly cloudy late tonight,
- AM clouds and sun, mostly sunny and a bit warmer Monday afternoon, mostly clear at night,
- AM sun, mostly cloudy and a bit warmer Tuesday with a good (50%) showers in the afternoon (under 0.10 in. of rain possible), showers late Tuesday night (0.10 in. of rain possible),
- Mostly cloudy with a (40%) of showers and a bit cooler Wednesday, a slight (20%) chance of showers at night.
- lows 48-52 cooling back to 48 Wednesday night highs 72-64.
- Mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday and in the evening, just partly cloudy late Thursday night,
- Partly cloudy Friday AM, mostly sunny and a bit warmer in the afternoon, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
- highs 65-80 lows 44-42 warming to 48 Sunday. (seasonal averages high 65 low 42)
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Eugene-Springfield Pollen Count
Grass………. Moderate (8)
Trees………. High (239)
Last Counted: 5/3/18
Data Courtesy of Oregon Allergy Associates
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Forecast for Roseburg:
- Mostly cloudy tonight and Monday AM, mostly sunny and warmer Monday afternoon, mostly clear at night,
- Partly cloudy Tuesday AM, becoming mostly cloudy and a bit warmer with a (30%) chance of showers in the afternoon (under 0.10 in. of rain possible) and Tuesday night (under 0.10 in. of rain possible),
- Mostly cloudy and a bit cooler a slight (20%) chance of showers Wednesday and in the evening, just mostly cloudy at night.
- lows 50-52 cooling to 48 Wednesday night highs 78-69.
- Mostly cloudy and a bit warmer Thursday and at night,
- Partly cloudy and a bit warmer Friday, mostly clear Friday night,
- The mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
- highs 70-83 lows 46-52. (seasonal averages high 68 low 46)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy tonight and Monday AM, becoming mostly sunny and a bit warmer in the afternoon, mostly clear in the evening, partly cloudy late Monday night,
- Mostly cloudy with a (40%) of coastal showers and a bit warmer Tuesday while partly cloudy inland in the AM and mostly cloudy with a (40%) chance of showers and a bit warmer Tuesday afternoon (under 0.10 in. of rain possible) at night (under 0.10 in. of rain possible),
- Mostly cloudy with a (30%) chance of showers and a bit cooler Wednesday, a slight (20%) chance of evening showers, then just mostly cloudy Wednesday night.
- lows 49-53 highs 62-64 cooling to 59 Wednesday.
- Mostly cloudy Thursday, partly cloudy at night and Friday, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday, mostly clear at night,
- Then sunny Sunday.
- highs 57-68 lows 46-50. (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 and Monday AM, mostly sunny and a bit warmer Monday afternoon, mostly clear Monday night,
- AM sun, a mix of clouds and sun and a bit warmer with a good (50%) chance of showers and a slight (20%) chance of thunderstorms Tuesday afternoon and evening, showers likely (70%) late Tuesday night,
- Mostly cloudy and a bit cooler with a good (50%) chance of showers Wednesday, then a slight (20%) chance of showers at night.
- snow level 8,000 ft. tonight, free air freezing level 10,000 ft. rising to 11,000 ft. Monday afternoon, 11,000 ft. rising to 12,000 ft. late Monday night, snow level above 8,000 ft. Tuesday and Tuesday night, then 6,500 ft. Wednesday and Wednesday night.
- lows 39-43 cooling to 35 Wednesday night highs 63-52.
- Mostly cloudy with a slight (20%) chance of AM showers, just mostly cloudy and a bit warmer Thursday afternoon and evening, partly cloudy with a slight (20%) chance of showers Thursday night,
- A slight (20%) chance of showers Friday and at night,
- Mostly sunny and a bit warmer Saturday, mostly clear Saturday night,
- Then sunny and a bit warmer Sunday.
- snow level 6,000 ft. Thursday 7,000 ft. Thursday evening, free air freezing level 6,500 ft. late Thursday night, 6,500 ft. rising to 8,000 ft. Friday afternoon, 8,000 ft. rising to 9,000 ft. late Friday night, 9,000 ft. rising to 11,000 ft. Saturday, 11,000 ft. rising to 12,000 ft. Saturday night, then 12,000 ft. Sunday.
- highs 53-70 lows 34-43.
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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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