A slow moving Upper Level Low Pressure Trough  (“U” shape) starts a slow cooling trend. The graphics for days 1-3 show a weak cold front to our north today then sliding through the Pacific Northwest Friday for cooling. The graphics for days 3-7  Sunday through Thursday show no frontal activity moving into the Pacific Northwest through the period.

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ADVISORIES:

• A RED FLAG WARNING IS IN EFFECT THROUGH 11 PM TONIGHT  FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 11 PM FRIDAY AFTERNOON FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY 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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• Mostly clear with patchy fog late tonight,
• Some AM clouds with patchy fog, sunny and a bit cooler Friday afternoon, mostly clear with patchy fog late Friday night,
• Some AM clouds with patchy fog, sunny and a bit cooler Saturday afternoon,  mostly clear with patchy fog late at night,
• Some AM clouds, sunny and a bit warmer Sunday afternoon, then mostly clear with patchy fog late Sunday night,
• lows 57-55 highs 84-82 warming back to 84 Sunday.
•  Sunny and a bit warmer Monday, clear with patchy fog late Monday night,
• Mostly sunny and a bit warmer Tuesday, mostly clear at night,
• Mostly sunny and a bit cooler Wednesday afternoon, partly cloudy with patchy fog Wednesday night,
• Patchy AM fog, then partly cloudy and a bit cooler Thursday.
•  highs 88-90 cooling to 88 Thursday lows 57-60. (seasonal averages high 88 low 58).

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

• Partly cloudy this evening, becoming mostly cloudy with patchy late evening fog that continues overnight tonight,
• AM clouds with patchy fog, sunny and a bit warmer Friday afternoon,  partly cloudy in the evening, mostly cloudy late Friday night,
• Partly cloudy and a bit cooler Saturday and at night,
• Mostly sunny and a bit warmer Sunday, then mostly clear Sunday night.
• lows 54-52 highs 70-68 warming back to 70 Sunday.
• Patchy AM fog, sunny Monday afternoon, mostly clear in the evening, mostly cloudy with patchy fog late Monday night,
• Mostly sunny and a bit warmer Tuesday, mostly clear in the evening, mostly cloudy with patchy fog late at night,
• Mostly cloudy with patchy AM fog, partly cloudy and a bit cooler Wednesday afternoon, partly cloudy in the evening, mostly cloudy with patchy fog late Wednesday night,
• AM clouds with patchy fog, then sunny and a bit warmer Thursday.
• highs 70-72 cooling back to 70 Wednesday warming back to 72 Thursday lows 52-56.
• (seasonal averages high 67 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Mostly clear tonight,
• Sunny and a bit cooler Friday and Saturday, mostly clear both nights,
• Sunny and a bit warmer Sunday, then mostly clear Sunday night.
• free air freezing level 15,000 ft. tonight, 14,000 ft. Friday and  Friday night, then 13,000 ft. Saturday through Sunday night.
• lows 46-45 warming 47 Sunday night highs 74-72 warming to 73 Sunday.
• Sunny and a bit warmer Monday, partly cloudy in the evening, mostly clear late Monday night,
• Sunny and a bit warmer Tuesday, partly cloudy at night,
• Then sunny and a bit cooler Wednesday and Thursday, mostly cloudy with a slight (20%) of evening showers, partly cloudy with a slight (20%) chance of showers late Wednesday night,
• free air freezing level 13,000 ft. Monday, 14,000 ft. Monday night through Wednesday, snow level above 8,000 ft. Wednesday night, then free air freezing level 14,000 ft. Thursday.
• highs 79-82 cooling to 76 Thursday lows near 52.