An Upper Level High Pressure Ridge (“Arch”shape) keeps heating us up. The graphics for days 1-3 show the no frontal systems approaching or moving through the Pacific Northwest Monday. The graphics for days 3-7   Tuesday through Saturday show a cold frontal system pushing through the Pacific Northwest by Tuesday and another cold front pushes in next Friday and Saturday.

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ADVISORIES:

• A HEAT ADVISORY IS IN EFFECT 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 UNTIL 8 PM MONDAY FOR CENTRAL DOUGLAS COUNTY AND THE DOUGLAS COUNTY FOOTHILLS.
• AN EXTREME HEAT WARNING IS IN EFFECT FROM 2 PM TODAY 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.
• 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 11 AM UNTIL 10 PM SUNDAY FOR THE  LOWER COLUMBIA RIVER.
• A HEAT ADVISORY IS IN EFFECT 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.
• A HEAT ADVISORY IS IN EFFECT FROM NOON MDT SUNDAY UNTIL 9 PM MDT FOR THE OREGON LOWER TREASURE VALLEY.

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 Sunday, clear Sunday night,
• Sunny and a bit cooler Monday, clear at night,
• Sunny Tuesday, then clear Tuesday night.
• lows 65-67 cooling to 59 Monday night warming to 62 Tuesday night highs 98-94.
• Sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Mostly sunny and a bit cooler Thursday, mostly clear at night,
• Mostly sunny Friday, mostly clear Friday night,
• Then sunny Saturday.
•  highs 96-92 lows 62-58 (seasonal averages high 86 low 57).

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

• Mostly clear this evening, partly cloudy late tonight,
• Some AM clouds, sunny Sunday afternoon, mostly clear in the evening, partly cloudy late Sunday night,
• Some AM clouds sunny and a bit cooler Monday, mostly clear in the evening, partly cloudy late at night,
• Mostly sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
• lows 54-55 cooling to 52 Monday night warming to 54 Tuesday night highs 73-70 warming to 72 Tuesday.
• Mostly sunny Wednesday, partly cloudy with patchy fog late Wednesday night,
• Patchy AM fog, partly cloudy and a bit warmer Thursday afternoon, partly cloudy at night,
• Partly cloudy Friday an Friday night,
• Some AM clouds, then sunny Saturday afternoon.
• highs 74-70 lows 54-52.
• (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 Sunday, clear Sunday night,
• Sunny and a bit cooler Monday, clear at night,
• Sunny Tuesday, clear Tuesday night.
• free air freezing level 16,000 ft. tonight through Tuesday night.
• lows 56-50 warming to 52 Tuesday night highs 86-82.
• Sunny and a bit warmer Wednesday, clear Wednesday night,
• Sunny and a bit cooler Thursday, clear at night,
• Then sunny Friday and Saturday, clear Saturday night.
• highs 84-82 lows 53-52.
• free air freezing level 16,000 ft. Wednesday and Wednesday night, 15,000 ft. Thursday, 16,000 ft. Thursday night, 15,000 ft. Friday, then 16,000 ft. Friday night and Saturday.
• highs 84-82 lows 53-52.