August 10, 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
- AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM SUNDAY MORNING THROUGH THURSDAY EVENING FOR CENTRAL COAST RANGE OF WESTERN OREGON, THE SOUTH WILLAMETTE VALLEY, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
- AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM MONDAY MORNING THROUGH THURSDAY EVENING FOR THE COAST RANGE OF NORTHWEST OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, THE UPPER HOOD RIVER VALLEY, THE WESTERN COLUMBIA RIVER GORGE, AND THE CENTRAL COLUMBIA RIVER GORGE.
- AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM SUNDAY AFTERNOON THROUGH THURSDAY AFTERNOON FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
- A FIRE WEATHER WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH MONDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL OREGON CASCADE FOOTHILLS, AND THE WILLAMETTE 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 PETSAn Upper Level Low Pressure Trough (“U” shape) offshore keeps our weather pattern stable with a bit above normal temperatures. The graphics for days 1-3 show a frontal system falling apart just to our north. The graphics for days 3-7 Tuesday through Saturday show a frontal system moving through Tuesday and Wednesday with another approaching the coast next Thursday and Friday. Haze and smoke have finally reached Eugene and Springfield. AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE RIVER.
THE WEATHER PATTERN
- An Upper Level Low Pressure Trough (“U” shape) keeps our weather pattern stable with a bit above normal temperatures. Upper level High Pressure takes over for serious heating starting Saturday. The graphics for days 1-3 show no fronts moving into the Pacific Northwest. The graphics for days 3-7 Sunday through Thursday show a frontal system to our north all of next week but it won’t be moving into the Pacific Northwest.
Forecast For The South Willamette Valley Including Eugene-Springfield:
- Clear tonight,
- Sunny and a bit warmer Friday, clear Friday night,
- Mostly sunny Saturday, mostly clear at night,
- Sunny and a bit warmer, Hot, Sunday, then mostly clear Sunday night.
- lows 56-63 highs 90-99.
- Mostly sunny and a bit warmer, Hot, Monday, mostly clear Monday night,
- Sunny and Hot Tuesday and Wednesday, mostly clear both nights,
- Then mostly sunny and hot but slightly cooler Thursday.
- highs 104-100 lows near 64. (seasonal averages high 85 low 52)
Forecast for the Umpqua Valley including Roseburg:
- Clear tonight,
- Sunny and warmer Friday, clear Friday night,
- Sunny and a bit warmer Saturday, mostly clear at night,
- Sunny and a bit warmer, Hot, Sunday, then mostly clear Sunday night.
- lows 59-66 highs 92-100.
- Mostly sunny and a bit warmer, Hot Monday, and Tuesday, mostly clear both nights,
- Sunny and Hot, Wednesday, mostly clear Wednesday night,
- Then mostly sunny and a bit cooler Thursday.
- highs 105-106 cooling to 103 Thursday lows near 68. (seasonal averages high 87 low 58)
Forecast for the Oregon Coast including Coos Bay and North Bend:
- Mostly clear this evening, partly cloudy late tonight,
- Sunny and a bit warmer Friday, clear in the evening, mostly cloudy late Friday night,
- AM clouds, sunny Saturday afternoon, mostly clear in the evening, mostly cloudy late at night,
- AM clouds, sunny Sunday afternoon, then mostly clear Sunday night.
- lows 58-60 highs near 79.
- Mostly sunny and a bit warmer Monday, mostly clear in the evening, partly cloudy late Monday night,
- Sunny and a bit cooler Tuesday, partly cloudy Tuesday night,
- Sunny Wednesday, partly cloudy Wednesday night,
- Then partly cloudy and a bit cooler Thursday.
- highs 83-80 lows near 60. (seasonal averages high 67 low 54)
Forecast for the Northern Oregon Cascades including Willamette Pass:
- Clear with evening smoke and haze, clear and hazy late tonight,
- Sunny and hazy and a bit warmer Friday, evening haze, clear late Friday night,
- Mostly sunny and a bit Saturday, mostly clear at night,
- Mostly sunny and a bit warmer Sunday, then mostly clear Sunday night.
- free air freezing level 16,000 ft. tonight, 15,000 ft. Friday, 15,000 ft. rising to 16,000 ft. late Friday night, 16,000 ft. Saturday and Saturday night, then above 16,000 ft. Sunday and Sunday night,
- lows 46-57 highs 77-85.
- Mostly sunny and a bit warmer Monday, mostly clear Monday night,
- Mostly sunny and a bit warmer Tuesday, mostly clear at night,
- Mostly sunny and a bit cooler Wednesday, partly cloudy Wednesday night,
- Then mostly sunny and a bit cooler Thursday.
- free air freezing level above 16,000 ft. Monday and Monday night, then 16,000 ft. Tuesday through Thursday.
- highs 88-90 cooling to 85 Thursday lows near 60.