August 15, 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 WARNING IS IN EFFECT UNTIL 11 PM WEDNESDAY FOR THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 10 PM THURSDAY FOR THE LOWER COLUMBIA, THE UPPER HOOD RIVER VALLEY, THE WESTERN COLUMBIA RIVER GORGE, AND THE CENTRAL COLUMBIA RIVER GORGE.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE COAST RANGE OF NORTHWEST OREGON, AND THE LOWER COLUMBIA.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM WEDNESDAY FOR SISKIYOU MOUNTAINS AND THE SOUTH CENTRAL OREGON CASCADES.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PM THURSDAY FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PM THURSDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND THE SOUTH CENTRAL OREGON CASCADES.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PM THURSDAY THURSDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PM THURSDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS AND THE SOUTH CENTRAL OREGON CASCADES.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PH THURSDAY FOR THE SISKIYOU MOUNTAINS AND THE SOUTHERN OREGON CASCADES.
- AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 11 PM THURSDAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, THE JOHN DAY BASIN, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
- A HEAT ADVISORY IS IN EFFECT UNTIL 10 PM THURSDAY FOR THE NORTHERN OREGON CASCADES, AND THE CASCADES IN LANE COUNTY.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM WEDNESDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS AND THE SOUTH CENTRAL OREGON CASCADES.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM THURSDAY FOR THE GRANDE RONDE VALLEY, WALLOWA COUNTY, THE NORTHERN BLUE MOUNTAINS OF OREGON, THE SOUTHERN BLUE MOUNTAINS OF OREGON, THE OCHOCO, THE JOHN DAY HIGHLANDS, WALLOWA COUNTY, THE EAST SLOPES OF THE OREGON CASCADES, CENTRAL OREGON, AND THE NORTHWEST BLUE MOUNTAINS.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM WEDNESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
- A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH OREGON CASCADE FOOTHILLS AND THE MT. HOOD NATIONAL FOREST WEST OF CASCADE CREST.
- A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM TODAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, AND THE FREMONT-WINEMA NATIONAL FOREST.
- A FIRE WEATHER WATCH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, AND THE FREMONT-WINEMA NATIONAL FOREST.
- A FIRE WEATHER WATCH IS IN EFFECT FROM THIS AFTERNOON THROUGH THIS EVENING FOR ABUNDANT LIGHTNING FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT.
- AN AIR QUALITY ADVISORY FOR SMOG IS IN EFFECT UNTIL 6 AM THURSDAY FOR THE SOUTH WILLAMETTE VALLEY.
- AN AIR QUALITY ADVISORY FOR SMOKE IS IN EFFECT UNTIL 5 PM TODAY FOR THE SOUTH WILLAMETTE VALLEY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 5 PM TODAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY, AND THE CASCADES IN LANE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 6 PM THURSDAY FOR SMOG FOR THE GREATER PORTLAND METRO AREA AND THE CENTRAL WILLAMETTE VALLEY.
HEALTH ADVISORIES
- A RECREATIONAL USE HEALTH ADVISORY HAS BEEN ISSUED FOR CULLABY LAKE IN CLATSOP 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 LAKE AND SLOUGH 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 AREA AND ENJOY ACTIVITIES SUCH AS CATCH AND RELEASE 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. DRINKING WATER FROM THE LAKE IS ESPECIALLY DANGEROUS.
- A RECREATIONAL USE HEALTH ADVISORY HAS BEEN EXPANDED FOR THE AREA FROM THE ROSS ISLAND LAGOON TO RIVERPLACE MARINA IN MULTNOMAH 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 LAKE AND SLOUGH 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 AREA AND ENJOY ACTIVITIES SUCH AS CATCH AND RELEASE 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. DRINKING WATER FROM THE LAKE IS ESPECIALLY DANGEROUS.
- A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR THE WILLAMETTE RIVER NEAR WILLAMETTE COVE IN MULTNOMAH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM HAS BEEN EXPANDED TO EXTEND DOWNSTREAM (NORTH) TO THE AREA NEAR CATHEDRAL PARK IN PORTLAND. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE AND SLOUGH 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 AREA 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.DO NOT DRINK THE WATER.
- A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR ARRONS LAKE, PETE’S SLOUGH, AND STURGEON LAKE ON SAUVIE ISLAND 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 LAKE AND SLOUGH 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 AREA 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 RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR AGENCY LAKE AND EXTENDED THE ADVISORY FOR THE SOUTHERN PORTION OF UPPER KLAMATH LAKE, FROM HOWARD’S BAY SOUTH TO THE LINK RIVER DAM IN KLAMATH 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 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
- Upper Level Low Pressure off the California coast will help to slowly cool our Hot temperatures. The graphics for days 1-3 show no fronts moving into the Pacific Northwest. The graphics for days 3-7 Thursday through Monday show a frontal system to our north all of next week but it won’t be moving into the Pacific Northwest until next Friday through Monday. Then another cold front to our northwest next Tuesday.
Forecast For The South Willamette Valley Including Eugene-Springfield:
- Sunny and slightly cooler, still Hot today, mostly clear tonight,
- Sunny and still hot, Wednesday, partly cloudy at night,
- Partly cloudy and a bit cooler, still Hot Thursday, then partly cloudy Thursday night.
- highs 100-96 lows 63-59.
- Mostly sunny and a bit cooler Friday, mostly clear Friday night,
- AM sun, partly cloudy and a bit cooler Saturday and at night,
- Partly cloudy and a bit cooler Sunday, partly cloudy Sunday night,
- Then partly cloudy and a bit cooler Monday.
- highs 89-83 lows 54-56 (seasonal averages high 85 low 52)
Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit cooler, still Very Hot today, mostly clear and hazy tonight,
- Sunny and a bit cooler, still Hot, Wednesday, mostly clear in the evening, partly cloudy with a slight (20%) chance of thunderstorms late at night,
- Partly cloudy and a bit cooler, still Hot Thursday, then partly cloudy Thursday night.
- highs 106-97 lows 66-63.
- Mostly sunny and a bit cooler Friday, mostly clear Friday night,
- Mostly sunny Saturday, partly cloudy with a slight (20%) chance of thunderstorms at night,
- Sunny and a bit cooler with a slight (20%) chance of thunderstorms Sunday, partly cloudy with a slight (20%) chance of evening thunderstorms, just partly cloudy late Sunday night,
- Some AM clouds, then sunny and a bit cooler Monday afternoon.
- highs 92-85 lows near 57. (seasonal averages high 86 low 57)
Forecast for the Oregon Coast including Coos Bay and North Bend:
- Partly cloudy and hazy with patchy dense AM coastal fog, sunny and hazy and a bit warmer this afternoon, mostly clear with evening coastal haze and patchy dense fog while mostly clear with evening inland haze, partly cloudy and hazy with patchy dense coastal fog late while partly cloudy and hazy inland late tonight,
- Some AM clouds with patchy coastal fog, sunny and a bit cooler Wednesday afternoon, mostly clear in the evening, partly cloudy at night with patchy coastal fog late at night,
- Patchy AM fog, mostly cloudy and a bit cooler Thursday afternoon, mostly cloudy in the evening, then partly cloudy late Thursday night.
- highs 82-78 lows 59.
- Sunny and a bit cooler Friday, mostly clear in the evening, partly cloudy late Friday night,
- Sunny Saturday, partly cloudy at night,
- Some AM clouds, sunny Sunday afternoon, partly cloudy Sunday night,
- Some AM clouds with patchy fog, then sunny Monday afternoon.
- highs near 77 lows near 57. (seasonal averages high 67 low 54)
Forecast for the Northern Oregon Cascades including Willamette Pass:
- AM haze with areas of smoke, a mix of clouds and sun and a bit cooler with areas of smoke and a slight (20%) chance of showers and thunderstorms this afternoon, mostly cloudy with areas of smoke and a slight (20%) chance of evening showers and thunderstorms, just mostly clear late at night, mostly cloudy with areas of smoke late tonight,
- Some AM clouds, mostly sunny Wednesday, partly cloudy at night,
- Partly cloudy and a bit cooler Thursday, then partly cloudy Thursday night.
- free air freezing level 16,000 ft. this afternoon, 16,000 ft. late tonight through Wednesday night, then 15,000 ft. Thursday and Thursday night.
- highs 90-84 lows 62-56.
- Some AM clouds, sunny and a bit cooler Friday afternoon, partly cloudy Friday night,
- Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy with a slight (20%) chance of showers, late at night,
- Partly cloudy and a bit cooler with a slight (20%) chance of showers Sunday and a slight (20%) chance of afternoon and evening thunderstorms, just partly cloudy late Sunday night,
- Then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Monday afternoon.
- free air freezing level 14000 ft. Friday and Friday night, then snow level above 8,000 ft. Saturday through Monday.
- highs 79-64 lows 50-45.