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  Thursday through Monday show a frontal system falling apart as it’s moving into the Pacific Northwest. A cold front will be to our northwest next Monday.

______________

ADVISORIES:

• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TONIGHT FOR LIGHTNING FOR THE BURNS BLM AND THE SOUTHERN GRASSLANDS.
• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TONIGHT FOR LIGHTNING FOR THE THE BAKER VALLEY.
• A FIRE WEATHER WATCH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING  FOR LIGHTNING FOR THE BURNS BLM AND THE SOUTHERN GRASSLANDS
• A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM MDT TONIGHT FOR LIGHTNING FOR THE CENTRAL CANYONLANDS AND NORTHWESTERN VALE BLM.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM TUESDAY 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 FIRE WEATHER WATCH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY 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 TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR ABUNDANT LIGHTNING FOR THE CENTRAL BLUE MOUNTAINS AND THE SOUTHERN BLUE MOUNTAINS.
• A FIRE WEATHER WATCH IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR 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 FIRE WEATHER WATCH IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTHERN OREGON CASCADES.
• 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.

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.

_______________

________________

• Clear with patchy fog late tonight,
• Sunny and a little bit warmer Tuesday, mostly clear Tuesday night,
• Sunny and a bit cooler with a slight (20%) chance of thunderstorms Wednesday, mostly cloudy with a slight (20%) chance of thunderstorms at night,  patchy fog late at night,
• Mostly cloudy with patchy AM fog, partly cloudy with a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon, partly cloudy in the evening, mostly clear with patchy fog late Thursday night.
• lows 58-62 cooling to 60 Thursday night highs 92-86.
• Patchy AM/late night fog, mostly sunny and a bit warmer Friday afternoon, mostly clear Friday night,
• Partly cloudy and a bit cooler Saturday, partly cloudy at night,
• Partly cloudy and a bit cooler Sunday, mostly clear Sunday night,
• Then partly cloudy and a bit warmer Monday.
• highs 86-85 warming to 87 Monday lows 59-58. (seasonal averages high 88 low 59).

_______________

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

• Becoming mostly cloudy with patchy late evening coastal fog continuing overnight becoming mostly cloudy with patchy inland fog late tonight, areas of fog even later tonight,
• Partly cloudy with areas of AM fog, sunny and a bit warmer Tuesday afternoon, mostly clear with patchy coastal evening fog and mostly cloudy with patchy coastal late at night while becoming mostly cloudy with patchy inland fog late Tuesday night,
• Mostly cloudy with patchy AM fog, sunny and a  bit cooler Wednesday afternoon, mostly cloudy with a slight (20%) chance of coastal thunderstorms late Wednesday night while a slight (20%) chance of inland thunderstorms at night,
• Patchy AM/late night fog, mostly cloudy with a slight (20%) chance of AM thunderstorms, just mostly cloudy and a bit warmer Thursday afternoon, partly cloudy in the evening,  mostly cloudy late Thursday night.
• lows 53-57 cooling to 55 Thursday night highs 72-70 warming back to 72 Thursday.
• AM/late night fog, partly cloudy Friday, partly cloudy Friday night,
• AM clouds with patchy fog, sunny Saturday afternoon, partly cloudy Saturday night,
• Then partly cloudy and a bit cooler Sunday, partly cloudy at night,
• Partly cloudy and a bit warmer Monday.
• highs 72-70 warming back to 72 Monday lows 55-53.
• (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 warmer with a slight (20%) chance of thunderstorms Tuesday afternoon, partly cloudy with a (40% ) chance of showers and a slight (20%) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of showers late Tuesday night,
• AM sun, a mix of clouds and sun and a bit cooler with a good (50%) chance of thunderstorms Wednesday afternoon, mostly cloudy with a good (50%) chance of thunderstorms at night,
• A mix of clouds and sun and cooler with a good (50%) chance of thunderstorms Thursday, partly cloudy with a slight (20%) chance of  thunderstorms Thursday night.
• free air freezing level 13,000 ft. tonight, 13,000 ft. rising to 14,000 ft. Tuesday afternoon, snow level above 8,000 ft. Tuesday night, free air freezing level 14,000 ft. Wednesday, 14,000 ft. falling to 13,000 ft. Wednesday night, then 13,000 ft. Thursday and Thursday  night.
• lows 52-53 cooling to 48 Thursday night highs 82-70.
• Mostly sunny and a bit warmer with a slight (20%) chance of showers Friday, partly cloudy in the evening,  mostly clear late Friday night,
• Sunny Saturday, mostly clear in the evening, partly cloudy late at night,
• Mostly sunny and a bit cooler Sunday, partly cloudy in the evening, mostly clear late Sunday night,
• Then mostly sunny Monday.
•  snow level above 8,000 ft. Friday, free air freezing level 13,000 ft.  Friday night through Sunday night, then 14,000 ft. Monday.
• highs 73-70 Sunday lows 47-45.