An approaching Broad Upper Level High Pressure Ridge (“Arch”shape) takes over heating us up. The graphics for days 1-3 show no frontal systems moving into or through the Pacific Northwest. The graphics for days 3-7   Thursday through Monday show the frontal systems that pushed into the Pacific Northwest Wednesday, then a cold front will be to our northwest next Monday.

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• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING FROM 2 PM UNTIL 11 PM TUESDAY FOR THE CENTRAL MOUNTAINS OF OREGON AND THE SOUTHERN DESCHUTES NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM UNTIL 11 PM TUESDAY.FOR THE KLAMATH BASIN, 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 IS IN EFFECT FOR ABUNDANT LIGHTNING FROM 2 PM UNTIL 11 PM TUESDAY FOR THE JOHN DAY VALLEY.
• A FIRE WEATHER WATCH IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE  AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE LOWER COLUMBIA BASIN OF OREGON.
• A FIRE WEATHER WATCH IS IN EFFECT FOR LIGHTNING FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING THE BURNS BLM, THE SOUTHERN GRASSLANDS, CENTRAL CANYONLANDS, AND THE NORTHWESTERN VALE BLM.
• A HEAT ADVISORY IS IN EFFECT FROM 11 AM UNTIL 9 PM TUESDAY FOR THE LOWER COLUMBIA BASIN OF OREGON, AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
• A HEAT ADVISORY IS IN EFFECT FROM NOON MDT UNTIL 9 PM MDT FOR THE OREGON LOWER TREASURE VALLEY.

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 with a slight (20%) chance of evening thunderstorms, just mostly clear late tonight,
• Sunny and a bit cooler Tuesday, mostly clear Tuesday night,
• Some AM clouds, sunny and a bit cooler Wednesday afternoon, mostly clear in the evening, then mostly cloudy late Wednesday night,
• AM clouds, sunny Thursday afternoon, clear Thursday night.
• lows 62-59 warming to 62 Wednesday night highs 92-86.                     .
• Sunny and a bit warmer Friday, clear Friday night,
• Sunny and a bit warmer Saturday, clear at night,
• Then sunny Sunday and Monday, clear Sunday night,
•  highs 92-94 lows 60-63 (seasonal averages high 84 low 56).

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

• Mostly clear this evening, mostly cloudy late tonight,
• AM clouds, sunny and a bit warmer Tuesday afternoon, partly cloudy in the evening, mostly cloudy late Tuesday night,
• Mostly cloudy start, partly cloudy and a bit warmer Wednesday afternoon, mostly cloudy at night,
• AM clouds, sunny and a bit warmer Thursday afternoon, then mostly clear Thursday night.
• lows 53-55 cooling to 53 Thursday night highs 68-72.
• Mostly sunny and a bit warmer Friday, mostly clear Friday night,
• Mostly sunny Saturday, a mostly clear in the evening, partly cloudy late at night,
• Mostly sunny Sunday, mostly clear Sunday  night,
• Then mostly sunny Monday.
• highs near 72 lows 52-55.
• (seasonal averages high 66 low 53).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Clear tonight,
• Sunny and a bit cooler Tuesday, mostly clear Tuesday night,
• Sunny and a bit cooler Wednesday, partly cloudy in the evening, mostly cloudy late at night,
• Mostly sunny and a bit cooler Thursday, then clear Thursday night.
• free air freezing level 15,000 ft, tonight and Tuesday, 15,000 ft. falling to 14,000 ft Tuesday night, 13,000 ft Wednesday, 14,000 ft. rising to  15,000 ft. Wednesday night, then 15,000 ft. Thursday and Thursday night.
• lows 55-48 highs 72-72.
• Sunny and warmer Friday, clear Friday night,
• Sunny and a bit warmer Saturday, mostly clear at night,
• Then sunny Sunday and Monday, clear Sunday night.
• highs 75-85 cooling to 83 Wednesday lows 48-54.
• free air freezing level 16,000 ft. Friday through Monday.
• highs 82-83 lows 52-53.