An Upper Level High Pressure Ridge (“Arch”shape)  heats us up again.  The graphics for days 1-3 show no frontal system moving through the Pacific Northwest through the period. The graphics for days  Saturday through Wednesday show a cold frontal system pushing through the Pacific Northwest by  Saturday and Sunday.

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ADVISORIES:

• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TODAY FOR CENTRAL DOUGLAS COUNTY AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TODAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE LOWER COLUMBIA RIVER, 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 FIRE WEATHER WATCH IS IN EFFECT FOR WIND AND LOW RELATIVE HUMIDITY FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING FOR THE JOHN DAY VALLEY, THE SOUTHERN BLUE MOUNTAINS, AND THE WARM SPRINGS RESERVATION.

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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• Sunny and hazy with patchy smoke and a bit warmer today, clear and hazy tonight,
• Sunny hazy and a bit cooler Thursday, clear with patchy fog late at night,
• Mostly sunny Friday, then clear Friday night.
• highs 100-92 lows 62-57 warming to 58 Friday night.
• Mostly sunny and a bit cooler Saturday and Sunday, mostly clear both nights.
• Patchy AM and late night fog, mostly sunny Monday, mostly clear Monday night,
• Some AM clouds, sunny Tuesday afternoon.
•  highs 92-86 warming to 87 Monday lows 59-58 (seasonal averages high 87 low 58).

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

• Sunny and hazy and warmer today, mostly clear this evening, mostly clear with evening coastal haze while mostly cloudy with inland haze late tonight,
• Mostly cloudy with AM inland haze, sunny and a bit cooler Thursday afternoon, mostly clear in the evening, mostly cloudy with areas of fog late at night,
• Patchy AM and late night fog, then partly cloudy and a bit warmer Friday, partly cloudy Friday night.
• highs 73-69 warming back to 70 Friday lows near 52.
• Patchy AM and late night fog, partly cloudy and a bit cooler Saturday and Saturday night,
• Patchy AM and late night fog, partly cloudy and a bit warmer Sunday, partly cloudy at night,
• Patchy AM fog, then partly cloudy with patchy fog Tuesday afternoon.
• highs 69-70  lows 52-53.
• (seasonal averages high 66 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Areas of AM smoke, sunny and hazy and a bit warmer this afternoon, clear tonight,
• Sunny and a bit cooler Thursday, clear at night,
• Sunny Friday, then mostly clear Friday night.
• free air freezing level 16,000 ft. tonight through Thursday, 16,000 ft falling to 15,000 ft. late Thursday night, then 15,000 ft. Friday and Friday night.
• highs 85-80 lows 53-48.
• Sunny and a bit cooler Saturday and Sunday, mostly clear both nights,
• Then sunny and a bit warmer Monday and Tuesday, mostly clear Monday night,
• highs 75-73 warming back to 75 Tuesday lows 47-48.
• free air freezing level 15,000 ft. Saturday and Saturday night, 14,000 ft. Sunday, then 15,000 ft. Sunday night through Tuesday.
• highs 84-82 lows 53-52.