Here is my weekly weather quiz question for the last time. “What are “Sastrugi?” Here is the correct answer. Sastrugi are ridges of snow formed on a snow field by the action of the wind.
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An Upper Level High Pressure Ridge (“Arch” shape) strengthens again over us bringing more sunshine and heat. The graphics for days 1-3 show a weak front offshore Sunday. The graphics for days 3-7 Tuesday through Saturday show a frontal system will be moving through Oregon next Tuesday and another will be offshore next Friday, then pushing into the Pacific Northwest next Saturday.
ADVISORIES:
- NONE AT THIS TIME.
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.
Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Mostly cloudy this evening, partly cloudy late tonight,
- A mix of clouds and sun Sunday, mostly clear Sunday night,
- Sunny Monday, mostly clear at night,
- Sunny Tuesday, then clear Tuesday night.
- lows 56-49 highs near 82.
- Sunny and a bit warmer Wednesday and Thursday (Independence Day), clear both nights,
- Sunny and a bit warmer Friday, clear Friday night,
- Then sunny and a bit cooler Saturday.
- highs 85-95 cooling to 93 Saturday lows 52-55. (seasonal averages high 79 low 50)
Forecast for the Umpqua Valley including Roseburg:
- Mostly clear this evening, partly cloudy with patchy evening fog, areas of fog late tonight,
- AM clouds with patchy fog, sunny and a bit warmer Sunday afternoon, mostly clear and hazy late Sunday night,
- Some AM clouds, sunny Monday, clear at night,
- Sunny Tuesday, then clear Tuesday night.
- lows 55-50 highs near 84.
- Sunny and a bit warmer Wednesday, clear Wednesday night,
- Sunny and a bit warmer Thursday (Independence Day), clear at night,
- Then sunny and a bit warmer Friday and Saturday, clear Friday night.
- highs 88-99 cooling to 97 Saturday lows 56-60. (seasonal average high 81 low 55)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Partly cloudy with patchy evening coastal fog while patchy late evening inland fog, mostly cloudy with areas of fog late late tonight,
- Mostly cloudy with areas of AM coastal fog while patchy AM inland fog, sunny Sunday afternoon, mostly clear in the evening, mostly cloudy and hazy late Sunday night,
- Some AM clouds, sunny and a bit cooler Monday, mostly clear at night,
- Mostly sunny Tuesday, then mostly clear Tuesday night.
- lows 55-50 highs 73-70.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Mostly sunny and a bit warmer Thursday (Independence Day), mostly clear at night,
- Mostly sunny Friday, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday.
- highs 72-76 lows near 53. (seasonal average high 65 low 53)
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Partly cloudy this evening, mostly cloudy late tonight,
- Mostly sunny Sunday, mostly clear Sunday night,
- Sunny and a bit warmer Monday, mostly clear at night,
- Sunny and a bit warmer Tuesday, then clear Tuesday night.
- free air freezing level 12,000 ft. tonight and Sunday, 12,000 ft. rising to 13,000 ft. Sunday night, 12,000 ft. rising to 13,000 ft. Monday afternoon, 14,000 ft. rising to 15,000 ft. Monday night, then 15,000 ft. Tuesday and Tuesday night.
- lows 45-42 highs 67-72.
- Sunny and a bit warmer Wednesday, clear Wednesday night,
- Sunny and a bit warmer Thursday (Independence Day), clear Thursday night,
- Sunny and a bit warmer Friday, clear Friday night,
- Then sunny Saturday.
- free air freezing level 16,000 ft. Wednesday through Thursday, then above 16,000 ft. Thursday night through Saturday,
- highs 76-86 lows 46-53.