An Upper Level High Pressure Ridge (“Arch”shape) takes over as the weak cold front left Oregon. The graphics for days 1-3 show the no frontal systems approaching or moving through the Pacific Northwest. The graphics for days 3-7   Monday through Friday show a cold frontal system will be to our northwest Monday then pushing through between Monday Tuesday and another cold front pushes in next Friday.

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ADVISORIES:

• A HEAT ADVISORY IS IN EFFECT FROM 2 PM SATURDAY UNTIL 8 PM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A HEAT ADVISORY IS IN EFFECT FROM 2 PM SATURDAY UNTIL 8 PM MONDAY FOR CENTRAL DOUGLAS COUNTY AND THE DOUGLAS COUNTY FOOTHILLS.
• AN EXTREME HEAT WARNING IS IN EFFECT FROM 2 PM SATURDAY UNTIL 8 PM MONDAY EVENING FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
• AN EXTREME HEAT WATCH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR THE TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, THE EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT., AND THE UPPER HOOD RIVER VALLEY.
• AN EXTREME HEAT WATCH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR THE LOWER COLUMBIA RIVER, THE PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, OUTER SOUTHEAST PORTLAND METRO, AND THE WEST COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT.
• A HEAT ADVISORY IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR THE TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, THE EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT., AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT FROM 11 AM UNTIL 10 PM SUNDAY FOR THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS.
• A HEAT ADVISORY IS IN EFFECT FROM NOON SATURDAY UNTIL 8 PM MONDAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS.

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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• Clear tonight,
• Sunny and a bit warmer Saturday, clear Saturday night,
• Sunny and a bit warmer Sunday, clear at night,
• Sunny and a bit cooler Monday, then clear Monday night.
• lows 62-67 cooling to 60 Monday night highs 96-98 cooling to 95 Monday.
• Sunny and a bit cooler Tuesday, clear Tuesday night,
• Sunny and a bit warmer Wednesday, mostly clear at night,
• Then mostly sunny and a bit cooler Thursday and Friday, mostly clear Thursday night.
•  highs 94-95 cooling to 87 Friday lows 62-58 (seasonal averages high 85 low 57).

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

• Mostly clear tonight,
• Sunny and a bit warmer Saturday, mostly clear in the evening, partly cloudy late Saturday night,
• Some AM clouds, sunny Sunday afternoon, mostly clear in the evening, partly cloudy late at night,
• Some AM clouds sunny and a bit cooler Monday, mostly clear in the evening, then partly cloudy late Monday night.
• lows 53-55 cooling to 52 Monday night highs 73-72.
• Some AM clouds, sunny Tuesday, mostly clear Tuesday night,
• Some AM clouds, sunny Wednesday, partly cloudy with patchy fog late at night,
• Patchy AM fog, partly cloudy and a bit cooler Thursday afternoon, partly cloudy  the evening, mostly cloudy late Thursday night,
• Mostly cloudy start, then sunny Friday afternoon.
• highs 72-69 lows near 54.
• (seasonal averages high 66 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

Forecast for the Northern Oregon Cascades including the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Saturday, clear Saturday night,
• Sunny and a bit warmer Sunday, clear at night,
• Sunny and a bit cooler Monday, then clear Monday night.
• free air freezing level 16,000 ft. tonight through Monday, then above 16,000 ft. Monday night.
• lows 52-56 cooling back to 52 Monday night highs 84-85 cooling to 82 Monday.
• Sunny and a bit warmer Tuesday, clear Tuesday night,
• Sunny Wednesday, mostly clear at night,
• Then sunny and a bit cooler Thursday and Friday, mostly clear Thursday night,
• highs 84-75 lows 54-48.
• free air freezing level 16,000 ft. Tuesday through Wednesday night, 15,000 ft. Thursday and Thursday night, then 14,000 ft. Friday.
• highs 82-83 lows 52-53.