Here is my weekly weather quiz question for the last time. What is a “Baroclinic leaf shield?” Here is the correct answer. A Baroclinic leaf shield is a cloud pattern on satellite images – frequently noted in advance of formation of a low pressure center. 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) will strengthen over us warming temperatures into the low 90s. The graphics for days days 1-3 show a weak frontal system moving through Monday to cool us down a bit. The graphics for days 3-7 show a frontal system trying to make an impact on us Thursday and another approaching the coast next Saturday.

________________

 

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 14 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 21 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM TODAY FOR ABUNDANT LIGHTNING WITH DRY FUELS FOR THE UMPQUA NATIONAL FOREST, THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, AND THE FREMONT-WINEMA NATIONAL FOREST. THAT INCLUDES NORTHERN, EASTERN, AND WESTERN KLAMATH COUNTY, WESTERN LAKE COUNTY, EASTERN DOUGLAS COUNTY, EASTERN JACKSON COUNTY, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM LATE MONDAY MORNING THROUGH MONDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTHERN OREGON CASCADES, THE EASTERN ROGUE VALLEY, AND FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• The Oregon Health Authority has updated the health advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A 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:

• Clear tonight,
• Mostly sunny and a bit warmer Monday, partly cloudy at night,
• Partly cloudy and a bit warmer Tuesday and Tuesday night,
• AM clouds, mostly sunny and a bit cooler Wednesday afternoon, clear in the evening, partly cloudy late at night.
• lows 55-58 highs 88-90 cooling to 86 Wednesday.
• Mostly sunny Thursday, Friday, Saturday, and Sunday, mostly clear each night.
• highs near 82 lows near 52. (seasonal averages high 84 low 52)
  _____

Eugene-Springfield Pollen Count
Grass………. Moderate (9)
Trees………. Low (5)
Last Counted: 7/20/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season just about over.

________________

 

Forecast for Roseburg:

• Partly cloudy and a bit warmer today, partly cloudy with a slight (20%) chance of evening thunderstorms, a slight (20%) chance of showers late tonight,
• Partly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Monday afternoon and Monday night,
• Partly cloudy with a slight (20%) chance of thunderstorms and a bit cooler Tuesday and at night.
• highs 94-86 lows 62-58.
• Mostly sunny Wednesday, mostly clear at night,
• Sunny and a bit cooler Thursday, clear Thursday night,
• Sunny and a bit warmer Friday, clear at night,
• Then sunny Saturday.
• highs 87-85 warming to 88 Friday and Saturday lows near 55. (seasonal averages high 86 low 57)

_____________________

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

• Mostly cloudy with patchy coastal fog and drizzle this AM, partly cloudy and a bit cooler this afternoon, mostly clear in the evening, partly cloudy late tonight,
• Partly cloudy and a bit cooler Monday and in the evening, mostly cloudy late at night,
• Then partly cloudy and a bit cooler Tuesday and Tuesday night.
• highs 66-63 lows 56-58 cooling back to 56 Tuesday night.
• Mostly cloudy Wednesday and Wednesday night,
• Partly cloudy and a bit warmer Thursday and at night,
• Partly cloudy Friday AM, sunny and a bit warmer in the afternoon, mostly clear Friday night,
• Then mostly sunny Saturday.
• highs 63-66 lows near 54. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms this afternoon through Tuesday, a (30%) chance of showers and thunderstorms in the evening, just partly cloudy at night.
• snow level above 8,000 ft. today through Tuesday, free air freezing level 14,000 ft. late Tuesday night night.
• highs 82-77 lows 54-48.
• Mostly sunny Wednesday AM, partly cloudy and a bit cooler in the afternoon, mostly clear at night,
• Mostly sunny and a bit cooler Thursday, mostly clear Thursday night,
• Then mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• free air freezing level 14,000 ft. Wednesday through Thursday night, 14,000 ft. rising to 15,000 ft. Friday afternoon, then 15,000 ft. Friday night , then 15,000 ft. falling to 14,000 ft. Saturday.
• highs near 74 lows near 47.

 

________________

**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.

________________