A slow moving Upper Level Low Pressure Trough  (“U” shape) continues the cool trend. 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  Wednesday through Sunday show a frontal system falling apart as it’s moving into the Pacific Northwest.

______________

ADVISORIES:

• A SEVERE THUNDERSTORM WARNING IS IN EFFECT UNTIL 8 PM MDT TONIGHT FOR EAST CENTRAL MALHEUR COUNTY.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 11 PM TONIGHT FOR THE KLAMATH BASIN AND THE FREMOINT-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 THE KLAMATH BASIN AND THE FREMOINT-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.

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.

_______________

________________

• Mostly clear with patchy fog late tonight,
•  Sunny and a bit warmer Monday, clear Monday night,
• Sunny and a bit warmer Tuesday, mostly clear at night,
• Sunny and a bit cooler with a slight (20%) chance of thunderstorms Wednesday afternoon, partly cloudy with a slight (20%) chance of evening thunderstorms,  then a slight (20%) chance showers late Wednesday night.
• lows 56-62 highs 89-92 cooling to 90 Wednesday.
• Mostly cloudy with patchy AM fog, a slight (20%) chance of thunderstorms and a bit cooler Thursday, partly cloudy with patchy fog late Thursday night,
• Patchy AM / late night fog, sunny and a bit warmer Friday afternoon, mostly clear at night,
• Mostly sunny and a bit cooler Saturday, mostly clear Saturday night,
• Some AM clouds, then sunny and a bit cooler Sunday afternoon.
• highs 86-89 cooling back to 86 Sunday lows 60-58. (seasonal averages high 88 low 59).

_______________

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

• Mostly clear with patchy evening coastal fog and partly cloudy with areas of coastal fog late tonight while partly cloudy with  patchy inland evening fog and areas of inland fog late tonight,
• Partly cloudy with patchy AM coastal fog and areas of inland AM fog, sunny and a bit warmer Monday afternoon, mostly clear with patchy evening coastal fog while patchy inland fog late Monday night,
• Areas of AM fog, sunny Tuesday afternoon, mostly cloudy with patchy coastal fog while mostly cloudy with patchy inland fog late at night,
• Mostly cloudy with patchy AM fog, sunny Wednesday afternoon, then mostly cloudy with patchy fog late Wednesday night.
• lows 52-56 highs near 72.
• Patchy AM/late night fog, mostly cloudy and a bit cooler Thursday and Thursday night,
• AM AM/late night fog, partly cloudy and a bit warmer Friday, partly cloudy at night,
• AM clouds with patchy fog, sunny Saturday afternoon, partly cloudy Saturday night,
• Then partly cloudy Sunday.
• highs 70-72 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 Monday afternoon, mostly clear Monday night,
• Sunny and a bit warmer Tuesday, mostly cloudy with a slight (20%) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of thunderstorms late at night,
• Mostly sunny and a bit cooler with a slight (20%) chance of thunderstorms Wednesday afternoon, then mostly cloudy with a slight (20%) of thunderstorms Wednesday night.
• free air freezing level 13,000 ft. tonight through Monday night, 13,000b ft. rising to 14,000 ft. Tuesday afternoon, snow level above 8,000 ft. Tuesday night, then 14,000 ft. Wednesday and Wednesday night.
• lows 49-53 cooling to 52 Wednesday night highs 77-82 cooling to 79 Wednesday.
• A mix of clouds and sun and a bit cooler with a (40%) chance of thunderstorms Thursday, mostly cloudy with a slight (20%) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of thunderstorms late Thursday night,
• Mostly sunny and a bit warmer with a slight (20%) chance of showers Friday, just mostly clear at night,
• Then sunny and a bit cooler Saturday and Sunday, partly cloudy in the evening, mostly clear late Saturday night,
• free air freezing level  14,000 ft. Thursday, 13,000 ft. Thursday night, snow level above 8,000 ft.  Friday, then free air freezing level 13,000 ft.  Friday night through Sunday.
• highs 72-74 cooling to 70 Sunday lows 49-47.