An Upper Level Low Pressure Trough  (“U “Shape) gives us onshore airflow to control temperatures and cause mountain thunderstorms. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7  Sunday through Thursday show a frontal system moving through the Pacific Northwest Sunday and another on Thursday.

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ADVISORIES:

• A RED FLAG WARNING IS IN EFFECT UNTIL 11 AM TODAY FOR THE CENTRAL MOUNTAINS OF OREGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 11 AM TODAY FOR ABUNDANT LIGHTNING FOR THE NORTHERN DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TONIGHT FOR ABUNDANT LIGHTNING FOR THE NORTHERN DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE WESTERN FORESTED BLUE MOUNTAINS, MOUNTAINS OF OREGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM TODAY FOR THE BURNS BLM AND THE THE SOUTHERN GRASSLANDS.
• A RED FLAG WARNING IS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR THE CENTRAL CANYONLANDS, THE NORTHWESTERN VALE BLM, AND THE BAKER VALLEY.
• A RED FLAG WARNING FOR ABUNDANT LIGHTNING IS IN EFFECT UNTIL 11 AM TODAY FOR THE CENTRAL BLUE MOUNTAINS, THE SOUTHERN BLUE MOUNTAINS, AND THE WESTERN FORESTED BLUE MOUNTAINS.
• A HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 11 PM TODAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
• A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE THE LOWER COLUMBIA BASIN OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.

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 start, partly cloudy and a bit warmer this afternoon, mostly cloudy late tonight,
• AM clouds, sunny Friday afternoon, partly cloudy with patchy evening coastal fog and areas of coastal fog late Friday night while becoming mostly cloudy with patchy inland fog late at night,
• Patchy AM/late night fog, mostly cloudy start, sunny Saturday afternoon, then mostly cloudy late Saturday night.
• highs near 72 lows near 55.
• Patchy AM/late night fog, mostly cloudy and a bit cooler Sunday and Sunday night,
• Mostly cloudy start, partly cloudy and a bit warmer Monday afternoon, partly cloudy with patchy fog late at night,
• Patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon, partly cloudy Tuesday night,
• Then partly cloudy and a bit warmer Wednesday.
• highs 70-75 lows 54-56.
• (seasonal averages high 67 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• AM clouds and sun, mostly cloudy and a bit cooler with a good (50%) chance of showers and a slight (20%)  chance of thunderstorms this afternoon, mostly cloudy with a (40%) chance of evening showers and a slight (20%) chance of thunderstorms, partly cloudy with a slight (20%) chance of showers late tonight,
• Mostly sunny and a bit warmer with a slight (20%) chance of thunderstorms Friday afternoon, partly cloudy with a slight (20%) chance of evening showers, then partly cloudy late Friday night,
• Sunny and a bit cooler Saturday, mostly clear in the evening, then partly cloudy late Saturday night.
• snow level above 8,000 ft. today and tonight, free air freezing level 13,000 ft. Friday, snow level above 8,000 ft. Friday night, then 13,000 ft. Saturday and Saturday night.
• highs 74-75 cooling back to 74 Saturday lows 49-47.
• Mostly sunny and a bit cooler Sunday, mostly cloudy with a slight (20%) chance of showers Sunday night,
• Mostly sunny and a bit cooler Monday, partly cloudy at night,
• Sunny and a bit warmer Tuesday, partly cloudy Tuesday  night,
• Then mostly sunny and a bit warmer Wednesday.
• free air freezing level 13,000 ft. Sunday, snow level above 8,000 ft. Sunday night, free air freezing level 12,000 ft. Monday, 13,000 ft. Monday night 14,000 ft. Tuesday, then 15,000 ft. Tuesday night and Wednesday.
• highs 69-66 warming to 75  Wednesday lows 44-48.