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 that slid through the Pacific Northwest today for cooling. The graphics for days 3-7  Monday through Friday show a frontal system offshore Thursday then moving in next Friday.

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ADVISORIES:

• A RED FLAG WARNING IS IN EFFECT UNTIL 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.

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 this evening, partly cloudy with patchy fog late tonight,
• Some AM clouds with patchy fog, sunny and a bit cooler Saturday afternoon,  mostly clear with patchy fog late Saturday night,
• Sunny and a bit warmer Sunday, clear with patchy fog late at night,
•  Sunny and a bit warmer Monday, clear with patchy fog late Monday night.
• lows 58-56 warming back to 58 Monday night highs 84-88.
• Sunny and a bit warmer Tuesday, mostly clear in the evening, partly cloudy late Tuesday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Wednesday and in the evening, mostly cloudy with patchy fog and a slight (20%) chance of showers late at night,
• AM clouds with patchy fog and a slight (20%) chance of showers, sunny and a bit cooler with a slight (20%) chance of showers Thursday afternoon, just partly cloudy Thursday night,
• Then partly cloudy and a bit warmer Friday.
• highs 92-85 warming to 88 Friday lows 60-62. (seasonal averages high 88 low 58).

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

• Partly cloudy with patchy coastal evening fog and mostly cloudy with areas of coastal fog late tonight while becoming mostly cloudy patchy late evening inland fog and areas of inland fog late tonight,
• AM clouds with areas of fog, sunny and a bit cooler Saturday afternoon, mostly clear with patchy evening coastal fog, and areas of fog late Saturday night,
• Some AM clouds with areas of fog, sunny Sunday afternoon, mostly clear with patchy evening coastal fog, partly cloudy with areas of fog late Sunday night,
• Patchy AM fog, sunny Monday afternoon, mostly clear with areas of fog late Monday night.
• lows 53-52 highs near 70.
• Areas of AM fog, mostly sunny and a bit warmer Tuesday afternoon, mostly clear in the evening, mostly cloudy with patchy fog late Tuesday night,
• Mostly cloudy with areas of AM fog, partly cloudy and a bit cooler Wednesday afternoon, patchy evening fog, mostly cloudy with patchy fog late Wednesday night,
• AM clouds with patchy fog, partly cloudy Thursday afternoon, patchy evening fog, mostly cloudy with patchy fog late Thursday night,
• A clouds, then sunny and a bit warmer Friday afternoon.
• highs 72-70 warming back to 72 Friday lows 55-56.
• (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 Saturday, mostly clear Saturday night,
• Sunny and a bit warmer Sunday, mostly clear at night,
• Sunny and a bit warmer Monday, partly cloudy in the evening, then mostly clear late Monday night.
• free air freezing level 14,000 ft. tonight, then 13,000 ft. Saturday through Monday night.
• lows 45-4 highs 74-72 warming to 73 Sunday.
• Sunny and a bit warmer Tuesday, mostly clear Tuesday night,
• Mostly sunny and a bit cooler with a slight (20%) chance of thunderstorms Wednesday, mostly cloudy with a slight (20%) of thunderstorms Wednesday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of thunderstorms Thursday, partly cloudy with a slight (20%) chance of thunderstorms Thursday night,
• Then mostly sunny Friday.
•  free air freezing level 14,000 ft. Tuesday through Thursday, then 13,000 ft. Thursday night and Friday.
• highs 79-82 cooling to 76 Thursday lows near 52.