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   Wednesday through Sunday show a cold frontal system pushing thrugh the Pacific Northwest by next Thursday through Sunday.

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ADVISORIES:

• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TUESDAY 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 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 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.
• 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 UNTIL 10 PM TONIGHT FOR THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS.
• A HEAT ADVISORY IS IN EFFECT  UNTIL 10 PM TONIGHT 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 UNTIL 9 PM MDT TONIGHT 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 and hazy tonight,
• Sunny and hazy and a bit cooler Monday, clear Monday night,
• Sunny and a bit warmer Tuesday, clear at night,
• Sunny and a bit warmer Wednesday, then clear Wednesday night.
• lows 67-58 warming to 63 Tuesday night cooling to 62 Wednesday night highs 93-99.
• Sunny and a bit cooler Thursday, clear Thursday night,
• Mostly sunny Friday and Saturday, mostly clear both nights,
• Sunny and a bit cooler Sunday.
•  highs 93-88 lows near 59 (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 with inland haze late,
• Some AM clouds with inland haze, sunny and a bit cooler Monday afternoon, mostly clear in the evening, partly cloudy late Monday night,
• Some AM  clouds, sunny and a bit warmer Tuesday afternoon, mostly clear Tuesday night,
• Mostly sunny Wednesday, then partly cloudy with patchy fog late Wednesday night.
• lows 55-49 warming to 53 Wednesday night highs 70-74 cooling to 72 Wednesday.
• Patchy AM fog and late night fog, partly cloudy and a bit warmer Thursday afternoon, partly cloudy Thursday night,
• Patchy AM and late night fog, partly cloudy Friday and Friday night,
• Patchy AM fog, partly cloudy Saturday afternoon, mostly clear Saturday night,
• Then sunny and a bit cooler Sunday.
• highs 82-77  lows 52-49.
• (seasonal averages high 66 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Clear tonight,
• Sunny and a bit cooler Monday, clear Monday night,
• Sunny Tuesday, clear at night,
• Sunny and a bit warmer Wednesday, then clear Wednesday night.
• free air freezing level 16,000 ft. tonight through Wednesday night.
• lows 54-50 warming to 52 Tuesday night highs 82-79 warming to 85 Wednesday.
• Sunny and a bit cooler Thursday, clear Thursday night,
• Sunny Friday, clear at night,
• and a bi cooler Saturday, clear Saturday night,
• Then sunny and a bit cooler Sunday.
• highs 82-79 warming to lows 53-52.
• free air freezing level 16,000 ft. Thursday and Thursday night, 15,000 ft. Friday, 16,000 ft. Friday night, then 15,000 ft. Saturday through Sunday.
• highs 84-82 lows 53-52.