July 20, 2023
Note: Weather is a constantly changing phenomenon and weather forecasting is a combination of science, experience, and intuition. The accuracy of any given forecast can chance due to unexpected changes in atmospheric conditions, so there are no guarantees the the actual weather will conform to the projected forecast.
ADVISORIES
- A FIRE WEATHER WATCH IS IN EFFECT FROM THIS AFTERNOON THROUGH THIS EVENING FOR THE WESTERN SISKIYOU NATIONAL FOREST.
HEALTH ADVISORIES
- A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR GALESVILLE RESERVOIR IN DOUGLAS COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE RESERVOIR WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE GALESVILLE RESERVOIR AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY.. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.
- 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.
THE WEATHER PATTERN
- An Upper Level High Pressure Ridge (“Arch” shape) will continue the onshore airflow through the Pacific Northwest, then slow warming will take place. The graphics for days 1-3 show a weak cold front approaching the coast Friday. The graphics for days 3-7 Sunday through Thursday show a cold front pushing through Oregon Sunday and more Monday through Wednesday.
Forecast For The South Willamette Valley Including Eugene-Springfield:
- AM clouds and haze from wildfire smoke, partly cloudy and hazy and a bit cooler this afternoon, clear tonight,
- Sunny Friday, mostly clear at night,
- Mostly sunny Saturday, then clear Saturday night.
- highs 87-92 lows near 54.
- Sunny and a bit cooler Sunday, clear Sunday night,
- Mostly sunny and a bit cooler Monday, mostly at night,
- Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Then mostly sunny and slightly warmer Wednesday.
- highs 89-86 warming back to 89 Wednesday lows 53-55. (seasonal averages high 86 low 52)
Forecast for the Umpqua Valley including Roseburg:
- AM sun and haze, sunny and hazy with patchy smoke and a bit cooler this afternoon, mostly clear and hazy late tonight,
- Sunny and a bit warmer Friday, mostly clear at night,
- Sunny Saturday, then clear Saturday night.
- highs 89-92 lows near 58.
- Mostly sunny and a bit cooler Sunday and Monday, mostly clear both nights,
- Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Then mostly sunny and a bit cooler Wednesday.
- highs 88-90 cooling back to 88 Wednesday lows 57- (seasonal averages high 87 low 58)
Forecast for the Oregon Coast including Coos Bay and North Bend:
- AM clouds and haze, sunny and a bit warmer this afternoon, becoming mostly cloudy late tonight,
- AM clouds, sunny and a bit warmer Friday afternoon, mostly clear in the evening, mostly cloudy late at night,
- Partly cloudy and a bit warmer Saturday, then partly cloudy Saturday night.
- highs 72-74 cooling back to 72 Saturday lows near 55.
- Sunny and a bit cooler Sunday, mostly clear in the evening, partly cloudy late Sunday night,
- Sunny and a bit warmer Monday, partly cloudy at night,
- Sunny and a bit warmer Tuesday, mostly clear in the evening, partly cloudy late Tuesday night,
- Then sunny and a bit cooler Wednesday.
- highs 73-75 cooling back to 73 Wednesday lows 54-56. (seasonal averages high 66 low 54)
Forecast for the Northern Oregon Cascades including Willamette Pass:
- Sunny and hazy and a bit cooler today, evening haze, mostly clear late tonight,
- Sunny and a bit warmer Friday, mostly clear at night,
- Sunny and a bit cooler Saturday, mostly clear Saturday night.
- free air freezing level 15,000 ft. today, then 16,000 ft. tonight through Saturday night.
- highs 83-80 warming to 82 Friday lows 50-48.
- Sunny and a bit cooler Sunday and Monday, mostly clear both nights,
- Then sunny and a bit warmer Tuesday and Wednesday, mostly clear Tuesday night,
- free air freezing level 16,000 ft. Sunday and Sunday night, 14,000 ft. Monday, then 15,000 ft. Monday night through Wednesday,
- highs 79-74 lows 46-44.