An Upper Level Low Pressure Trough (“U “Shape) keeps up the onshore airflow to control temperatures and cause mountain thunderstorms. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7 Monday through Friday show a frontal system that moved through the Pacific Northwest Sunday and another one is on the way Thursday.
______________
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:
- Sunny and a bit warmer today, mostly clear tonight,
- Sunny and a bit cooler Saturday, mostly clear in the evening, partly cloudy late at night,
- A mix of clouds and sun and a bit cooler Sunday, mostly cloudy in the evening, then partly cloudy late Sunday night.
- highs 90-82 lows 54-52.
- Mostly sunny Monday, partly cloudy Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Mostly sunny and as bit warmer Wednesday, partly cloudy in the evening, clear Wednesday night,
- Then mostly sunny Thursday.
- highs 82-88 lows 52-57. (seasonal averages high 86 low 52).
________________
Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit warmer today, mostly clear tonight,
- Sunny and a bit cooler Saturday, mostly clear in the evening, partly cloudy late at night,
- Mostly cloudy and a bit cooler Sunday, then mostly cloudy Sunday night.
- highs 88-90 cooling back to 88 Saturday lows 59-60 cooling to 56 Sunday night.
- Some AM clouds, sunny and a bit warmer Monday afternoon, mostly clear Monday night,
- Some AM clouds, sunny and a bit warmer Tuesday afternoon, mostly clear at night,
- Partly cloudy start, sunny Wednesday afternoon, mostly clear Wednesday night,
- Then partly cloudy Thursday.
- highs 83-90 lows 56-60. (seasonal averages high 88 low 58).
_______________
Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- AM clouds with patchy fog, sunny and a bit warmer this afternoon, mostly clear this evening, mostly cloudy with patchy fog late tonight,
- Mostly cloudy with areas of AM coastal fog while patchy AM inland fog, sunny Saturday afternoon, partly cloudy in the evening, mostly cloudy late Saturday night,
- Then mostly cloudy and a bit cooler Sunday and Sunday night.
- highs 72-69 warming back to 72 lows 57-54.
- Mostly cloudy start, sunny and a bit warmer Monday afternoon, partly cloudy with patchy fog late at night,
- Patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon, partly cloudy Tuesday night,
- Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
- Mostly cloudy start, then partly cloudy Thursday afternoon.
- highs 72-75 lows 53-58.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly sunny and a bit warmer with a slight (20%) chance of showers this afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly clear late tonight,
- Sunny and a bit cooler Saturday, mostly clear in the evening, partly cloudy late Saturday night,
- A mix of clouds and sun and a bit cooler with a (40%) chance of showers and a slight (20%) chance of thunderstorms Sunday, then mostly cloudy with (40%) chance of showers and a slight (20%) chance of thunderstorms Sunday night.
- snow level above 8,000 ft. today and tonight, 13,000 ft. Saturday and Saturday night, then snow level above 8,000 ft. Sunday and Sunday night,
- highs 76-69 lows 49-44.
- AM clouds and sun, mostly sunny with a slight (20%) chance of showers and a bit cooler Monday afternoon, just partly cloudy Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Then sunny and a bit warmer Wednesday and Thursday, partly cloudy Wednesday night.
- snow level above 8,000 ft. Sunday through Monday, free air freezing level 13,000 ft. Monday night through Tuesday night, 14,000 ft. Wednesday, then 15,000 ft. Wednesday through Thursday.
- highs 65-75 lows 44-43 warming to 49 Thursday.