Here is my weekly weather quiz question for the last time. What is a “Mountainado? ” Here is the correct answer. A Mountainado is a vertical-axis eddy produced in a downslope windstorm by the vertical stretching of horizontal roll vortices produced near the ground by vertical wind shear. Mountainadoes, when carried by the mean wind, can produce strong horizontal shears and wind gusts that are much more damaging than the general prevailing wind speeds.
An Upper Level Low Pressure Trough (“U” shape) keeps our weather pattern stable with a bit above normal temperatures. The graphics for days 1-3 show a weak cold front moving into the Pacific Northwest Monday and a stronger cold front will push in between Tuesday and Wednesday. The graphics for days 3-7 Wednesday through Sunday show the frontal system moving through Wednesday.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 5 PM MONDAY FOR THE SOUTH WILLAMETTE VALLEY, THE CASCADE FOOTHILLS IN LANE COUNTY, AND THE CASCADES IN LANE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL FURTHER NOTICE FOR KLAMATH COUNTY AND LAKE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 5 PM MONDAY FOR DESCHUTES COUNTY.
HEALTH ADVISORIES:
- THE PUBLIC HEALTH ADVISORY ISSUED FOR UNSAFE LEVELS OF FECAL BACTERIA IN OCEAN WATERS AT SEAL ROCK BEACH IN LINCOLN COUNTY HAS BEEN LIFTED. VISITORS SHOULD STILL AVOID WADING IN AREA CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER, AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.
- 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. 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.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy this evening, cloudy late tonight,
- Mostly cloudy start, partly cloudy Monday afternoon, partly cloudy Monday night,
- Some AM clouds, sunny and a bit warmer Tuesday afternoon, 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 Wednesday, then just partly cloudy Wednesday night.
- lows 59-56 warming back to 59 Wednesday night highs 88-90 cooling to 86 Wednesday.
- Some AM clouds, sunny and a bit warmer Thursday afternoon, clear Thursday night,
- Then sunny and a bit warmer Friday and Saturday, clear both nights,
- Then sunny and a bit warmer Sunday.
- highs 88-95 lows 56-58. (seasonal averages high 86 low 52)
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Grass Pollen: Absent (0)
Weeds: Low (5)
Forecast for the Umpqua Valley including Roseburg:
- Mostly clear with haze this evening, mostly cloudy and hazy late tonight,
- Mostly cloudy with AM haze, partly cloudy and a bit cooler Monday afternoon and Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Mostly sunny and a bit cooler Wednesday, then mostly clear Wednesday night.
- lows 62-59 warming back to 62 Wednesday night highs 88-92 cooling to 89 Wednesday.
- Mostly sunny and a bit warmer Thursday and Friday, clear both nights,
- Then sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
- highs 90-97 lows 60-62. (seasonal averages high 87 low 58)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with inland evening haze, mostly cloudy with coastal haze tonight,
- Mostly cloudy start, partly cloudy and a bit warmer Monday afternoon, mostly cloudy Monday night,
- AM clouds, sunny and a bit cooler Tuesday afternoon, mostly clear in the evening, partly cloudy late at night,
- AM clouds, sunny and a bit warmer Wednesday afternoon, partly cloudy in the evening, then mostly cloudy late Wednesday night.
- lows 62-59 highs 79-77 warming back to 79 Wednesday.
- Mostly sunny Thursday and Friday, mostly clear both nights,
- Mostly sunny Saturday, mostly clear in the evening, partly cloudy Saturday night,
- Then sunny Sunday.
- highs near 78 lows near 58. (seasonal averages high 67 low 54)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Partly cloudy with evening haze, mostly cloudy late tonight,
- Mostly cloudy start, partly cloudy and a bit warmer Monday afternoon, partly cloudy Monday night,
- Some AM clouds, mostly sunny and a bit warmer Tuesday afternoon, partly cloudy at night,
- Some AM clouds, mostly sunny and a bit cooler Wednesday afternoon, then partly cloudy Wednesday night.
- free air freezing level 13,000 ft. rising to 14,000 ft. late tonight, 13,000 ft. Monday, 13,000 ft. rising to 15,000 late Monday night, 15,000 ft. Tuesday and Tuesday night, 14,000 ft. Wednesday, then 15,000 ft. Wednesday night.
- lows near 47 highs 72-76 cooling back to 72 Wednesday.
- Mostly sunny and a bit warmer Thursday, clear Thursday night,
- Mostly sunny and a bit warmer Friday, mostly clear at night,
- Sunny and a bit warmer Saturday, mostly clear Saturday night,
- Then mostly sunny and a bit warmer Sunday.
- free air freezing level 15,000 ft. Thursday through Saturday, then 16,000 ft. Saturday night and Sunday.
- highs 74-82 lows 48-52.
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