An Upper Level High Pressure Ridge continues sunshine and some warming 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 possibly moving through Oregon between Saturday and next Sunday.

ADVISORIES:  

• A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 8 AM TUESDAY 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 MIDNIGHT TONIGHT UNTIL 8 AM TUESDAY FOR THE TILLAMOOK COUNTY COAST, THE CENTRAL CENTRAL COAST OF OREGON, THE CENTRAL OREGON COAST RANGE LOWLANDS, AND THE NORTHERN OREGON COAST RANGE.
• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM TUESDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT MDT UNTIL 10 AM MDT WEDNESDAY FOR THE OREGON LOWER TREASURE VALLEY.
• A FREEZE WARNING IS IN EFFECT FROM MIDNIGHT UNTIL 8 AM TUESDAY  FOR THE UPPER HOOD RIVER VALLEY.
• A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM 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 WARNING IS IN EFFECT FROM THIS 11 PM THIS EVENING UNTIL 9 AM TUESDAY FOR THE GRANDE RONDE VALLEY.
• A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM TUESDAY MORNING FOR  WALLOWA COUNTY.

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:

• Mostly clear tonight,
• Sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
• Patchy AM fog, sunny and a bit warmer Wednesday, clear at night,
• Patchy AM fog, sunny and warmer Thursday, then clear Thursday night.
• lows 40-45 highs 66-74.
• Sunny and a bit cooler Friday, mostly clear Friday night,
• A mix of clouds and sun and cooler Saturday, partly cloudy at night,
• A mix of clouds and sun and a bit cooler Sunday, partly cloudy with a (40%) chance of rain Sunday night,
• Then mostly cloudy and cooler with rain likely (70%) Monday.
• highs 82-84 cooling to 72 Sunday lows 48-46.
• (seasonal averages high 68 low 46).

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

• Partly cloudy with patchy fog late tonight,
• Patchy AM fog, mostly sunny and a bit warmer Tuesday, partly cloudy with patchy fog late Tuesday night,
• Patchy AM fog, sunny and a bit warmer Wednesday afternoon, then mostly clear at night,
• Sunny and a bit warmer Thursday, mostly clear Thursday night.
• lows 45-50 highs 55-58.
• Mostly sunny and a bit cooler Friday, mostly cloudy Friday night,
• Mostly cloudy and a bit cooler Saturday, mostly cloudy at night,
• A mix of clouds and sun and a bit cooler Sunday, mostly cloudy with a good (50%) chance of rain Sunday night,
• Then mostly cloudy and a bit cooler with rain likely (70%) Monday.
• highs 59-65 lows 43-50.
• (seasonal averages high 63 low 47).

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