Here is my weekly weather quiz question for the last time. What is “ Attenuation?” Here is the correct answer. Attenuation refers to the reduction of the radar beam power due to the reflection or absorption of energy when it strikes a target. The greatest attenuation occurs when the radar beam goes through very heavy rain. 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.

________________

 

An Upper level High Pressure Ridge (Shaded “Arch” shape with blue arrows) has taken over drying us out and warming us up for most of today. The graphics for days 1-3 shows the next front that moves toward the Pacific Northwest by late today. The graphics for days 3-7 show the front that will push into our area between next Friday night and next Saturday.

________________

 

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 29 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

________________

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.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

________________

Advisories:

• Permanent Health Advisory remains in effect for the South Umpqua River and Lawson 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.

________________

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

• Partly cloudy and a bit warmer today, increasing clouds with a (30%) chance of evening rain, mostly cloudy with rain late tonight (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, a bit cooler with a slight (20%) chance of showers Sunday afternoon (under 0.10 in. of rain possible),  just partly cloudy and colder at night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday afternoon, then mostly cloudy with a slight (20%) chance of showers and a bit warmer Monday night.
• highs 65-60 lows 48-38 warming to 44 Monday night.
• A mix of clouds and sun and a bit warmer Tuesday, partly cloudy and a bit warmer Tuesday night and Wednesday, mostly clear Wednesday night,
• Partly cloudy and a bit cooler Thursday, partly cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers and colder Friday.
• highs 68-75 cooling to 62 Friday lows 46-48. (seasonal averages high 64 low 41)

_____

 

Eugene-Springfield Pollen Count:

Grass………. Moderate (5)

Trees………. High (110)

Last Counted: 4/26/17

Data Courtesy of Oregon Allergy Associates.

_________________

 

Forecast for Roseburg:

• Partly cloudy and a bit warmer today, becoming mostly cloudy with a (40%) chance of rain late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), partly cloudy and a bit cooler with a slight (20%) chance of showers Sunday afternoon (0.10 in. of rain possible), just partly cloudy in the evening, mostly cloudy late Sunday night,
• Mostly cloudy and a bit warmer Monday and Monday night.
• highs 68-60 warming to 65 Monday lows 49-40 warming to 46 Monday night.
• Partly cloudy and a bit warmer Tuesday and at night,
• Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Sunny and a bit cooler Thursday, partly cloudy at night,
• Then partly cloudy with a slight (20%) chance of showers and a bit cooler Friday.
• highs 72-80 cooling to 68 Friday lows 49-52 cooling to 46 Thursday night. (seasonal averages high 66 low 44)

 

_____________________

 

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

• Partly cloudy and a bit warmer today, becoming cloudy with a (30%) chance of evening rain, cloudy with coastal rain late tonight while inland rain likely (60%) late tonight (u0.10 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), partly cloudy and a bit cooler with a slight (20%) chance of showers Sunday afternoon (under 0.10 in. of rain possible), partly cloudy in the evening, mostly cloudy late Sunday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Monday afternoon, then mostly cloudy at night.
• highs 59-55 lows 48-44 warming to 46 Monday night.
• Partly cloudy and a bit warmer Tuesday and Tuesday night,
• Mostly sunny Wednesday, mostly clear at night,
• Then partly cloudy and a bit cooler Thursday through Friday.
• highs 63-67 cooling to 63 Thursday 47 Friday lows 49-52 cooling to 47 Thursday night. (seasonal averages high 57 low 45)

 

________________

Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer today, mostly cloudy with a slight (20%) chance of evening rain, rain likely (70%) late tonight (0.25 in. of rain possible),
• AM showers, a mix of clouds and sun and a bit cooler with a good (50%) chance of showers Sunday afternoon, just partly cloudy Sunday night,
• Mostly cloudy Monday AM, partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers in the afternoon, then mostly cloudy with a slight (20%) chance of showers at night.
• free air freezing level 6,500 ft. rising to 7,500 ft. today, snow level 7,000 ft. tonight, 6,000 ft. Sunday, free air freezing level 6,500 ft. falling to 6,000 ft. Sunday night, 6,000 ft. Monday AM and snow level 5,000 ft. Monday afternoon, then 7,000 ft. Monday night.
• highs 53-44 warming to 46 Monday lows 35-28 warming to 32 Monday night .
• A mix of clouds and sun and a bit warmer Tuesday, just partly cloudy Tuesday night,
• Mostly sunny and a bit warmer Wednesday, mostly clear at night,
• Partly cloudy and a bit cooler Thursday, partly cloudy with a (40%) chance of showers Thursday night,
• Then a mix of clouds and sun with a (30%) chance of showers and colder Friday.
• snow level 8,000 ft. Tuesday, free air freezing level 11,000 ft. Tuesday night, 12,000 ft. Wednesday, 13,000 ft. Wednesday night and Thursday, snow level above 8,000 ft. Thursday night, then 7,500 ft. Friday
• highs 57-65 cooling to 48 Friday lows 36-38.

________________

**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.

________________