An Upper Level Low Pressure Trough  (“U “Shape) keeps up the onshore airflow to control temperatures. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7  Wednesday through Sunday show a frontal system on the way to Oregon  between Thursday and Friday.

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ADVISORIES:

• A RED FLAG WARNING FOR ABUNDANT LIGHTNING ON DRY FUELS IS IN EFFECT UNTIL 8 PM TONIGHT FOR 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 FOR ABUNDANT LIGHTNING IS IN EFFECT UNTIL 8 PM TONIGHT FOR THE SOUTHERN BLUE MOUNTAINS.
• A RED FLAG WARNING FOR LIGHTNING IS IN EFFECT UNTIL 9 PM MDT TONIGHT FOR THE THE BURNS BLM, CENTRAL CANYONLANDS, NORTHWESTERN VALE BLM, AND THE BAKER VALLEY. (SPECIFICALLY FOR THE COW VALLEY AND DURKEE BURN SCAR)
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING UNTIL 8 PM TONIGHT FOR THE SOUTHERN BLUE MOUNTAINS.
• A FLASH FLOOD WARNING IS IN EFFECT 8:45 PM MDT TONIGHT FOR SOUTH CENTRAL BAKER AND NORTH CENTRAL MALHEUR COUNTIES.
• A FLOOD ADVISORY IS IN EFFECT UNTIL 8 PM TONIGHT FOR DESCHUTES COUNTY.

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

• Mostly cloudy with patchy late evening fog and areas of coastal fog late tonight while mostly cloudy with patchy inland fog late tonight,
• AM clouds with patchy fog, sunny and a bit warmer Monday afternoon, partly cloudy with patchy evening coastal fog and areas of coastal fog late at night while patchy inland fog late Monday night,
• Partly cloudy with areas of AM coastal fog while patchy AM inland fog, partly cloudy and a bit warmer Tuesday afternoon and evening, partly cloudy with patchy coastal fog and a slight (20%) chance of showers late Tuesday night while mostly cloudy with a slight (20%) chance of inland showers and patchy inland fog late at night,
• Mostly cloudy with patchy AM fog and a slight (20%) chance of showers, partly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon, mostly cloudy with patchy fog and a slight (20%) chance of evening showers, then mostly cloudy with areas of fog late Wednesday night.
• lows 54-58 highs 72-75.
• Mostly cloudy AM fog and a slight (20%) chance of showers, just mostly cloudy and a bit cooler Thursday afternoon, mostly cloudy with patchy fog late Thursday night,
• Some AM clouds with patchy fog, sunny and a bit warmer Friday afternoon, mostly clear Friday night,
• Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
• highs 74-78 lows 55-57.
• (seasonal averages high 67 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Mostly cloudy tonight,
• Mostly sunny and a bit warmer Monday, mostly clear in the evening, partly cloudy late Monday night,
• Sunny and a bit warmer Tuesday, partly cloudy at night,
• Mostly sunny and a bit cooler Wednesday, then mostly cloudy with a slight (20% chance of showers Wednesday night.
• free air freezing level 13,000 ft. falling to 12,000 ft. tonight, 12,000 ft.  Monday, 13,000 ft. Monday night through Wednesday, then snow level above 8,000 ft. Wednesday night.
• lows 43-48 highs 67-72 cooling to 70 Wednesday.
• A mix of clouds and sun Thursday, partly cloudy Thursday night,
• Sunny and a bit warmer Friday and Saturday, mostly clear both nights,
• Then sunny and a bit warmer Sunday.
• free air freezing level 14,000 ft. Thursday, 15,000 ft. Thursday night, 14,000 ft. Thursday, 15,000 ft. Thursday night through Saturday, then 16,000 ft. Saturday night and Sunday.
• highs 70-84 lows 45-52.