Jun
18.
Here is my weekly weather quiz question for the last time. What is a “Low Pressure System? ” Here is the correct answer. A Low Pressure System is an area of a relative pressure minimum that has converging winds and rotates in the same direction as the earth. This is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. Also known as an cyclone, it is the opposite of an area of high pressure, or a anticyclone.
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An Upper Level Low Pressure Trough (“U” shape) moving out of the Gulf of Alaska will bring at least some chances for rain. The graphics for days 1-3 show no frontal systems approaching the Pacific Northwest. The graphics for days 3-7 Wednesday through Sunday show no major frontal systems moving into Oregon.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 31 in the Good category measuring Ozone.
Oakridge: The Air Quality Index is 5 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 29 in the Good category measuring Ozone.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES
- A FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 7 AM MONDAY FOR CENTRAL AND EASTERN LAKE COUNTY.
- A FREEZE WARNING IS IN EFFECT FROM 1AM UNTIL 8 AM TUESDAY FOR CENTRAL AND EASTERN LAKE COUNTY.
- A FREEZE WARNING IS IN EFFECT FROM 2AM UNTIL 7 AM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
- A FROST ADVISORY IS IN EFFECT FROM 2AM UNTIL 7 AM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
- A FREEZE WARNING IS IN EFFECT FROM 1AM UNTIL 8 AM TUESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
- A FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 7 AM MONDAY FOR CENTRAL AND EASTERN LAKE COUNTY.
- A FREEZE WARNING IS IN EFFECT FROM 1 AM UNTIL 8 AM TUESDAY FOR CENTRAL AND EASTERN LAKE COUNTY.
HEALTH 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:
- Mostly cloudy with a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
- Mostly cloudy with showers (0.25 in. of rain possible, more in storms) and a slight (20%) chance of thunderstorms and a bit cooler Monday (Juneteenth), a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, showers likely (70%) late Monday night (0.10 in. of rain possible, more in storms),
- Mostly cloudy and a bit warmer with showers likely (70%) Tuesday (0.10 in. of rain possible), a slight (20%) chance of evening showers, just partly cloudy late Tuesday night,
- Some AM clouds, sunny and warmer Wednesday (Summer Solstice 7:57 am), then mostly clear Wednesday night.
- lows 45-49 Tuesday night highs 60-74.
- Mostly sunny and a bit warmer Thursday, partly cloudy Thursday night,
- Partly cloudy and a bit cooler Friday, partly cloudy at night,
- Partly cloudy Saturday, partly cloudy Saturday night,
- AM sun, then partly cloudy and a bit warmer Sunday afternoon.
- highs 82-78 warming back to 82 Sunday lows 48-52 cooling to 50 Saturday night. (seasonal averages high 75 low 48)
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Eugene-Springfield Pollen Count:
Grass Pollen: High (114)
Weeds: Low (3)
Tree Pollen: Low (8)
Last counted: 6.18.23
Data courtesy of Oregon Allergy Associates.
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Forecast for the Umpqua Valley including Roseburg:
- Mostly cloudy with a slight (20%) chance of evening thunderstorms, showers likely (70%) tonight (under 0.10 in. of rain possible),
- Mostly cloudy with showers likely (70%) and slightly cooler with a slight (20%) chance of thunderstorms Monday (Juneteenth)( 0.10 in. of rain possible), a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, a (30%) chance of showers late Monday night (under 0.10 in. of rain possible),
- Mostly cloudy with a (40%) chance of showers and a bit warmer Tuesday, mostly cloudy in the evening, partly cloudy late at night,
- Mostly sunny and warmer Wednesday (Summer Solstice 7:57 am), then mostly clear Wednesday night.
- low 48-53 highs 62-79.
- Some AM clouds, sunny and a bit warmer with a slight (20%) chance of thunderstorms Thursday afternoon, partly cloudy with a slight (20%) chance of thunderstorms Thursday night,
- Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Friday, partly cloudy at night,
- Partly cloudy and a bit warmer Saturday, mostly clear in the evening, partly cloudy late Saturday night and Sunday AM, then sunny and a bit warmer Sunday afternoon.
- highs 85-80 warming back to 85 Sunday lows 53-56 cooling to 54 Saturday night. (seasonal averages high 77 low 53)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with a slight (20%) chance of evening showers, late evening coastal showers likely (70%) late tonight and showers late tonight while inland late evening showers likely (70%), showers late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with AM showers and a slight (20%) chance of thunderstorms, a good (50%) chance of coastal showers with a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon while inland showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon (Juneteenth)( 0.10 in. of rain possible), a (40%) chance of coastal showers Monday night while a (30%) chance of evening inland showers and a slight (20%) chance of thunderstorms and a (40%) chance of inland showers late Monday night (0.10 in. of rain possible),
- Mostly cloudy and a bit warmer with a (30%) chance of showers Tuesday (0.10 in. of rain possible), just mostly cloudy in the evening, partly cloudy late at night,
- Partly cloudy and a bit warmer Wednesday (Summer Solstice 7:57 am), then partly cloudy Wednesday night.
- lows 47-50 highs 60-68.
- AM clouds, sunny and a bit warmer Thursday, mostly cloudy Thursday night,
- Mostly cloudy and a bit cooler Friday, mostly cloudy at night,
- Partly cloudy and a bit warmer Saturday, partly cloudy Saturday night,
- Then partly cloudy Sunday.
- highs 69-66 warming to 68 Saturday and Sunday lows near 52. (seasonal averages high 64 low 52)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with rain showers and snow showers likely (70%) and a slight (20%) chance of thunderstorms late tonight (0.50 in. of rain possible),
- Mostly cloudy with AM rain showers and snow showers likely (70%) and a slight (20%) chance of thunderstorms, rain showers and a bit cooler with snow showers and a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible, more in storms, 1-3 in. of snow possible), evening showers with possible snow showers and thunderstorms likely (70%), a good (50%) chance of rain and snow showers and a slight (20%) chance of thunderstorms late Monday night (0.10 in. of rain possible, more in storms, 1 in. of snow possible),
- Mostly cloudy with a good (50%) chance of AM snow showers, a good (50%) chance of showers and a bit warmer Tuesday afternoon, a (40%) chance of evening showers, just partly cloudy late at night,
- Mostly sunny and warmer Wednesday (Summer Solstice 7:57 am), then just partly cloudy late Wednesday night.
- snow level 4,500 ft. tonight, 4,000 ft. Monday, 4,500 ft. Monday night, 5,000 ft. rising to 6,000 ft. Tuesday afternoon, 6,500 ft. Tuesday night, free air freezing level 9,000 ft. Wednesday, then 10,000 ft. Wednesday night.
- lows 29-38 highs 40-62.
- AM sun, partly cloudy and a bit warmer with a slight (20%) chance of showers Thursday afternoon, a (40%) chance of evening showers, just partly cloudy late Thursday night,
- Partly cloudy with a slight (20%) chance of AM showers, a bit cooler with a (40%) chance of showers and a slight (20%) chance of thunderstorms Friday afternoon, partly cloudy with a (30%) chance of evening showers, just partly cloudy late Friday night,
- Some AM clouds, sunny and a bit warmer Saturday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Saturday night,
- AM sun, partly cloudy and a bit warmer with a slight (20%) chance of showers Sunday afternoon.
- snow level above 8,000 ft. Thursday through Sunday.
- highs 66-62 warming to 72 Sunday lows 42-39 warming back to 42 Saturday night.
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For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com
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