A strengthening Upper Level High Pressure Ridge (“Arch “Shape) brings some warming. The graphics for days 1-3 show what’s left of a weak cold front that’s sliding out of the Pacific Northwest. The graphics for days 3-7  Friday through Tuesday show a frontal system falling apart as it’s moving into the Pacific Northwest. A cold front will be to our northwest next Monday.

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ADVISORIES:

• A TSUNAMI ADVISORY IS IN EFFECT UNTIL FURTHER NOTICE FOR THE COASTAL AREAS OF OREGON, WASHINGTON, AND BRITISH COLUMBIA FROM THE OREGON/CALIFORNIA BORDER TO THE BRITISH COLUMBIA/ALASKA BORDER\.
• A RED FLAG WARNING IS IN EFFECT FROM 11AM UNTIL 11 PM WEDNESDAY FOR THUNDERSTORMS FOR THE NORTHERN WILLAMETTE NATIONAL FOREST AND THE SOUTHERN WILLAMETTE NATIONAL FORECAST.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM WEDNESDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE UMPQUA NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE CENTRAL MOUNTAINS OF OREGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM WEDNESDAY UNTIL 11 AM THURSDAY FOR THE CENTRAL MOUNTAINS OF REGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 9 PM WEDNESDAY FOR THE CENTRAL MOUNTAINS OF OREGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM WEDNESDAY UNTIL 11 AM THURSDAY FOR ABUNDANT LIGHTNING FOR THE NORTHERN DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 9 PM WEDNESDAY FOR ABUNDANT LIGHTNING FOR THE NORTHERN DESCHUTES NATIONAL FOREST.
• 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, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM WEDNESDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST, 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 WEDNESDAY UNTIL 11 AM THURSDAY FOR THE WESTERN FORESTED BLUE MOUNTAINS. MOUNTAINS OF OREGON AND THE DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM WEDNESDAY UNTIL 11 AM THURSDAY FOR THE WESTERN FORESTED BLUE MOUNTAINS.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 9 PM WEDNESDAY FOR THE WESTERN FORESTED BLUE MOUNTAINS.
• A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE BURNS BLM AND THE SOUTHERN GRASSLANDS.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM WEDNESDAY FOR THE BURNS BLM AND THE THE SOUTHERN GRASSLANDS.
• A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE NORTHWESTERN VALE BLM.
• A FIRE WEATHER WATCH IS IN EFFECT FROM 11 AM WEDNESDAY THROUGH 11 AM THURSDAY FOR THUNDERSTORMS (15%-35% CHANCE) FOR THE NORTHERN WILLAMETTE NATIONAL FOREST AND THE SOUTHERN WILLAMETTE NATIONAL FOREST.
• A FIRE WEATHER WATCH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY MORNING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE UMPQUA NATIONAL FOREST.
• A FIRE WEATHER WATCH IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM WEDNESDAY EVENING THROUGH THURSDAY MORNING FOR THE UMPQUA BASIN.
• A HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 11 PM WEDNESDAY 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 FROM NOON WEDNESDAY UNTIL 11 PM THURSDAY 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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• Mostly clear tonight,
• Sunny with a slight (20%) chance of thunderstorms Wednesday afternoon, partly cloudy with a slight (20%) chance of evening thunderstorms, mostly cloudy with a slight (20%) chance of thunderstorms late at Wednesday night,
• Mostly cloudy with patchy AM fog, partly cloudy with a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon and in the evening, mostly clear late at night,
• Mostly sunny and a bit warmer Friday, then mostly clear Friday night.
• lows 59-62 cooling to back to 59 Friday night highs 92-85 warming to 89 Friday.
• Some AM clouds, sunny and a bit cooler Saturday afternoon, partly cloudy Saturday night,
• Partly cloudy and a bit cooler Sunday, partly cloudy in the evening, mostly clear at night,
• Then partly cloudy and a bit warmer Monday and Tuesday, partly cloudy Monday night,
• highs 87-84 warming to 88 Tuesday lows 57-55 warming to 88 Tuesday. (seasonal averages high 88 low 59).

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

• Mostly clear with patchy dense coastal evening fog and mostly cloudy with fog continuing late tonight while becoming mostly cloudy with patchy inland fog late tonight,
• Mostly cloudy with patchy AM fog, sunny and a  bit warmer with a slight (20%) of inland thunderstorms Wednesday afternoon, mostly cloudy with patchy coastal fog late Wednesday night with a slight (20%) chance of coastal thunderstorms late Wednesday night while mostly cloudy with a slight (20%) chance of inland thunderstorms with patchy fog late Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM coastal thunderstorms while  cloudy with a slight (20%) chance of inland thunderstorms, partly cloudy with patchy dense fog Thursday afternoon, mostly cloudy with patchy fog late Thursday night,
• AM/late night fog, partly cloudy Friday afternoon, partly cloudy Friday night,
• lows 55-57 cooling back to 55 Friday night highs near 72.
• Patchy AM/late night fog, partly cloudy and a bit cooler Saturday and Saturday night,
• Patchy AM/late night fog, mostly cloudy start, sunny Sunday afternoon, partly cloudy at night,
• Partly cloudy and a bit warmer Monday and in the evening, mostly cloudy with patchy fog late Monday night,
• AM clouds with patchy fog, then sunny and a bit warmer Tuesday afternoon.
• highs 70-73 lows 54-56.
• (seasonal averages high 67 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late tonight,
• Mostly sunny and a bit warmer with a good (50%) chance of thunderstorms Wednesday afternoon (0.25 in.of rain possible), mostly cloudy with a good (50% ) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun and cooler with a good (50%) chance of showers and a slight (20%)  chance of thunderstorms Thursday, mostly cloudy with a slight (20%) chance of evening showers and thunderstorms, partly cloudy with a slight (20%) chance of showers late at night,
• Mostly sunny and a bit warmer with a slight (20%) chance of showers Friday, partly cloudy in the evening, then mostly clear late Friday night.
• snow level above 8,000 ft. tonight, free air freezing level 14,000 ft. Wednesday and Wednesday night, snow level above 8,000 ft. Thursday and Thursday night, then free air freezing level 13,000 ft. Friday and Friday night.
• lows 53-48 highs 82-77.
• Sunny Saturday, mostly clear in the evening, partly cloudy late Saturday night,
• Mostly sunny and a bit cooler Sunday, partly cloudy at night,
• Mostly sunny Monday, partly cloudy Monday night,
• Then sunny Tuesday.
•  snow level above 8,000 ft. Friday, free air freezing level 13,000 ft. Friday night through Saturday night, 12,000 ft. Sunday, 13,00  ft. Sunday night and Monday, then 14,000 ft. Monday night and Tuesday.
• highs 73-70 Sunday lows 47-45.