An Upper Level High Pressure Ridge has taken over continuing sunshine and warmer temperatures to the Pacific Northwest. The graphics for days 1-3 show no frontal systems moving in through the period. The graphics for days 3-7  Tuesday through Saturday show a cold frontal system moving through Oregon between Saturday and next Sunday.

ADVISORIES:  

• A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 9 AM SUNDAY FOR NORTH OREGON COAST RANGE LOWLANDS, CENTRAL OREGON COAST RANGE,  THE TUALATIN VALLEY, EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, EAST CENTRAL WILLAMETTE VALLEY, BENTON COUNTY LOWLANDS, LINN COUNTY LOWLANDS, LANE COUNTY LOWLANDS, WEST COLUMBIA RIVER GORGE OF OREGON ABOVE 5OO FT., CLACKAMAS COUNTY CASCADE FOOTHILLS, THE CASCADE FOOTHILLS OF MARION AND LINN COUNTIES, AND THE LANE COUNTY CASCADE FOOTHILLS.
• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM MONDAY FOR CENTRAL DOUGLAS COUNTY.
• A FREEZE WARNING IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 8 AM MONDAY FOR THE UPPER HOOD RIVER VALLEY.
• A FREEZE WATCH IS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING FOR THE LOWER COLUMBIA BASIN OF OREGON, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
• A FREEZE WATCH IS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING FOR THE GRANDE RONDE VALLEY.
• A FREEZE WATCH IS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING FOR  WALLOWA COUNTY.
• A BEACH HAZARDS STATEMENT IS IN EFFECT FOR DANGEROUS SNEAKER WAVES THROUGH MONDAY AFTERNOON FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.

HEALTH ADVISORIES:

• 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 Umpqua Valley including Roseburg:

• Clear tonight,
• Areas of AM frost, sunny and a bit warmer Monday afternoon (Columbus Day – Indigenous People’s Day), mostly clear Monday night,
• Sunny and a bit warmer Tuesday, mostly clear at night,
• Patchy AM fog, sunny and a bit warmer Wednesday, then clear Wednesday night.
• lows 36-45 highs 66-74.
• Sunny and warmer Thursday, clear Thursday night,
• Sunny and a bit warmer Friday, mostly clear at night
• Mostly sunny and a cooler Saturday,  partly cloudy Saturday night,
• Then a mix of clouds and sun and a bit cooler Sunday.
• highs 82-84 cooling to 72 Sunday lows 48-46.
• (seasonal averages high 69 low 46).

Forecast for the South Oregon Coast Including Coos Bay and North Bend:

• Clear with patchy fog late tonight,
• Patchy AM fog, sunny and a bit cooler Monday (Columbus Day – Indigenous People’s Day), partly with cloudy with patchy fog late Monday night,
• Patchy AM fog, mostly sunny and a bit warmer Tuesday, partly cloudy with patchy fog late at night,
• Patchy AM fog, sunny Wednesday afternoon, then mostly clear Wednesday night.
• lows 44-47 cooling to 46 Tuesday night highs 55-58.
• Sunny and a bit warmer Thursday, mostly clear Thursday night,
• Sunny and a bit cooler Friday, partly cloudy at night,
• A mix of clouds and sun and a bit cooler Saturday, mostly cloudy Saturday night,
• Then a mix of clouds and sun with a slight (20%) chance of rain Sunday.
• highs 59-65 lows 43-50.
• (seasonal averages high 64 low 47).

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