July 21, 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 HEAT ADVISORY IS IN EFFECT UNTIL MIDNIGHT MDT SUNDAY NIGHT FOR THE OREGON LOWER TREASURE VALLEY.
- A HEAT ADVISORY IS IN EFFECT UNTIL MIDNIGHT MDT SATURDAY NIGHT FOR THE OWYHEE MOUNTAINS AND MALHEUR COUNTY.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR BAKER COUNTY.
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 Saturday. The graphics for days 3-7 Monday through Friday show frontal activity pushing through Oregon Monday through Wednesday.
Forecast For The South Willamette Valley Including Eugene-Springfield:
- Mostly sunny and a bit warmer today, mostly clear tonight,
- Sunny and a bit warmer Saturday, mostly clear at night,
- Some AM clouds, mostly sunny and a bit cooler Sunday, then mostly clear Sunday night.
- highs 89-90 cooling to 88 Sunday lows 53-56 cooling to 53 Sunday night.
- Mostly sunny start, partly cloudy and a bit cooler Monday afternoon, partly cloudy Monday night,
- Some AM clouds, mostly sunny and a bit warmer Tuesday afternoon, clear at night,
- Mostly sunny and slightly warmer Wednesday, clear Wednesday night,
- Then sunny Thursday.
- highs 85-89 lows near 55. (seasonal averages high 86 low 52)
Forecast for the Umpqua Valley including Roseburg:
- Partly cloudy and hazy with patchy AM smoke, sunny and hazy with patchy smoke and a bit warmer this afternoon, mostly clear and hazy tonight,
- Sunny and hazy Saturday, mostly clear with evening haze, partly cloudy and hazy late at night,
- Mostly sunny and hazy and a bit cooler Sunday, then mostly clear and hazy Sunday night.
- highs 93-88 lows 58-62 cooling back to 58 Sunday night.
- Mostly sunny and hazy Monday, mostly clear and hazy Monday night,
- Mostly sunny and hazy and a bit warmer Tuesday, mostly clear and hazy at night,
- Mostly sunny and hazy and a bit cooler Wednesday, clear and hazy Wednesday night,
- Then sunny and hazy Thursday.
- highs 87-90 lows 59-57 (seasonal averages high 87 low 58)
Forecast for the Oregon Coast including Coos Bay and North Bend:
- AM clouds, sunny and a bit warmer this afternoon, partly cloudy this evening, mostly cloudy late tonight,
- AM clouds with inland haze, sunny and a bit cooler with inland haze Saturday afternoon, partly cloudy in the evening, mostly cloudy late at night,
- Partly cloudy and hazy Sunday, then partly cloudy Sunday night.
- highs 74-72 lows 55-57 cooling back to 55 Sunday night.
- Partly cloudy and a bit warmer Monday, partly cloudy Monday night,
- Mostly sunny and hazy and a bit warmer Tuesday, mostly clear and hazy at night,
- Mostly sunny and hazy and a bit cooler Wednesday, mostly clear and hazy Wednesday night,
- Then mostly sunny and hazy and a bit cooler Thursday.
- highs 75-73 lows near 55. (seasonal averages high 67 low 54)
Forecast for the Northern Oregon Cascades including Willamette Pass:
- AM haze, sunny this afternoon, mostly clear tonight,
- Sunny Saturday, mostly clear at night,
- Sunny and a bit cooler Sunday, then mostly clear Sunday night.
- free air freezing level 16,000 ft. tonight through Sunday, then 15,000 ft. Sunday night.
- highs 80-77 lows 48-45.
- Mostly sunny and a bit cooler Monday, partly cloudy Monday night,
- Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Then sunny and a bit warmer Wednesday and Thursday,clear Wednesday night.
- free air freezing level 14,000 ft. Monday through Tuesday, 15,000 ft. Tuesday night and Wednesday, then 16,000 ft. Wednesday night and Thursday.
- highs 72-77 lows 45-47.