An Upper Level High Pressure Ridge (“Arch”shape) keeps heating us up after stable temperatures  for your Tuesday.  The graphics for days 1-3 show the weak cold frontal system moving through the Pacific Northwest late today that postpones heat increases for one day. The graphics for days 3-7   Friday through Tuesday show a cold frontal system pushing through the Pacific Northwest by next Saturday and Sunday.

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ADVISORIES:

• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM WEDNESDAY FOR CENTRAL DOUGLAS COUNTY AND THE DOUGLAS COUNTY FOOTHILLS.
• AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 8 PM THIS EVENING EVENING FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A HEAT ADVISORY IS IN EFFECT FROM THIS AFTERNOON THROUGH WEDNESDAY EVENING FOR THE LOWER COLUMBIA RIVER, THE TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, THE EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT., AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT FROM NOON TODAY UNTIL 10 PM WEDNESDAY FOR THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM MONDAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS.

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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• Sunny and a bit cooler today, hazy with patchy evening smoke, clear late tonight,
• AM haze, sunny and a bit warmer Wednesday, clear at night,
• Sunny and a bit cooler Thursday, then clear Thursday night.
• highs 92-99 cooling back to 92 Thursday lows 64-58.
• Mostly sunny Friday, clear Friday night,
• Mostly sunny and a bit cooler Saturday, mostly clear at night.
• Then mostly sunny and a bit cooler Sunday, mostly clear Sunday night,
• Then mostly sunny and a bit warmer Monday.
•  highs 92-86 warming to 87 Monday lows 59-58 (seasonal averages high 86 low 58).

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

• Some AM  clouds, sunny and a bit warmer this afternoon, mostly clear tonight,
• Sunny and a bit warmer Wednesday, mostly clear in the evening, mostly cloudy with patchy fog late at night,
• Patchy AM and late night fog, partly cloudy and a bit cooler Thursday afternoon, partly cloudy Thursday night.
• highs 70-73 cooling back to 70 Thursday lows near 53.
• Patchy AM and late night fog, partly cloudy Friday and Friday night,
• Patchy AM and late night fog, partly cloudy Saturday afternoon and at night,
• Patchy AM fog, then partly cloudy Sunday and Monday, partly cloudy Sunday night.
• highs near 70  lows 53-52.
• (seasonal averages high 66 low 54).                                                                                                                                                                                                                                                                                                                                                                                                                         _______________

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

• Sunny today, clear tonight,
• Sunny and a bit warmer Wednesday, clear at night,
• Sunny and a bit cooler Thursday, then clear Thursday night.
• free air freezing level 16,000 ft. today through Thursday night,
• highs 82-84 cooling back to 82 Thursday lows 52-53 cooling back to 52 Thursday night.
• Sunny and a bit cooler Friday, clear Friday night,
• Sunny and a bit cooler Saturday, mostly clear in the evening , partly cloudy late at night,
• Sunny and a bit cooler Sunday, mostly clear in the evening, partly cloudy late Sunday night,
• Then sunny and a bit warmer Monday.
• highs 82-79 warming to lows 53-52.
• free air freezing level 15,000 ft. Friday through Saturday night, then 14,000 ft. Sunday through Monday.
• highs 84-82 lows 53-52.