An Upper Level High Pressure Ridge (“Arch”shape) weakens a bit allowing cooling.  The graphics for days 1-3 show a weak cold frontal system moving through the Pacific Northwest Friday to start dropping temperatures to more normal levels. The graphics for days 3-7  Sunday through Thursday show a cold frontal system pushing through the Pacific Northwest by Sunday and Monday.

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ADVISORIES:

• A RED FLAG WARNING IS IN EFFECT FROM 1 PM TODAY UNTIL 10 PM FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE LOWER COLUMBIA BASIN OF OREGON AND THE EASTERN COLUMBIA RIVER GORGE OF OREGON.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM TODAY UNTIL 10 PM FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL MOUNTAINS OF OREGON AND THE WARM SPRINGS RESERVATION.
• A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM FRIDAY FOR WIND AND RELATIVE HUMIDITY FOR THE JOHN DAY VALLEY.
• AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR JEFFERSON COUNTY.
• AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR KLAMATH AND LAKE COUNTIES..

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 slightly warmer Friday, mostly clear Friday night,
• Sunny and a bit cooler Saturday, mostly clear with patchy fog late at night,
• Patchy AM and late night fog, partly cloudy and a bit cooler Sunday, then partly cloudy Sunday night.
• lows near 58 highs 92-85.
• AM clouds, mostly cloudy and a bit cooler Monday afternoon, partly cloudy with patchy fog late Monday night,
• Some AM clouds, sunny and a bit warmer Tuesday afternoon, mostly clear with patchy fog late at night,
• Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Some AM clouds, sunny and a bit cooler Thursday afternoon.
•  highs 82-90 cooling to 88 Thursday lows 58-60 (seasonal averages high 87 low 58).

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

• Becoming  mostly cloudy with areas of late evening coastal fog continuing overnight while becoming mostly cloudy with patchy inland fog late tonight,
• Partly cloudy with areas of AM coastal fog while mostly cloudy with areas of AM inland fog, sunny and a bit warmer Friday afternoon, mostly clear in the evening, partly cloudy with inland patchy fog Friday night,
• Some AM clouds, sunny and a bit cooler Saturday afternoon, mostly clear in the evening, partly cloudy with patchy fog late at night,
• Patchy AM and late night fog, mostly cloudy Sunday afternoon, then Sunday night.
• lows 52-50 warming to 53 Sunday night highs 69-68.
• Patchy AM/late night fog, mostly cloudy Monday, partly cloudy Monday night,
• Patchy AM fog, partly cloudy and a bit warmer with patchy fog Tuesday afternoon, partly cloudy with patchy evening fog, areas of fog late at night,
• Patchy AM fog, partly cloudy and a bit warmer Wednesday afternoon, mostly cloudy Wednesday night,
• Then mostly cloudy and a bit cooler Thursday.
• highs 68-70 69 cooling to 69 Thursday lows 52-54.
• (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 Friday, mostly clear Friday night,
• Sunny and a bit cooler Saturday, mostly clear in the evening, partly cloudy late at night,
• Mostly sunny Sunday, then partly cloudy Sunday night.
• free air freezing level 16,000 ft. tonight, 15,000 ft. Friday through Saturday night, then 14,000 ft. Sunday and Sunday night.
• lows 50-46 highs 78-72.
• Mostly sunny and a bit cooler with a slight (20%) chance of showers Monday, partly cloudy Monday night,
• Sunny and a bit warmer with a slight (20%) chance of showers Tuesday, mostly clear Tuesday night,
• Then sunny and a bit warmer Wednesday and Thursday, mostly clear Thursday night.
• snow level above 8,000 ft. Monday, free air freezing level 12,000 ft. Monday night, snow level above 8,000 ft. Tuesday, free air freezing level 13,000 ft. Tuesday night and Wednesday, then 14,000 ft. Wednesday night and Thursday.
• highs 68-78 lows 46-52.