Here is my weekly weather quiz question for the last time. What is a “Lightning Channel? Here is the correct answer. A Lightning Channel is the irregular path through the air along which a lightning discharge occurs. A typical discharge of flash between the ground and the cloud is actually a composite flash which is composed of several sequential lightning strokes, each of which is initiated by a leader and terminated by a return streamer.

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A blocking  Upper Level High Pressure Ridge (“Arch” shape) has taken over bringing a heat wave. The graphics for days 1-3  show system, show no frontal systems approaching the Pacific Northwest. The graphics for days 3-7  Tuesday through next Saturday show a quiet weather pattern with a complex frontal system lingering offshore through Thursday and then pushing through Oregon next Friday and Saturday.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 47 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 26 in the good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 43 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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ADVISORIES

• A HEAT  ADVISORY IS IN EFFECT UNTIL 11 PM SUNDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HEAT ADVISORY IS IN EFFECT UNTIL  11PM SUNDAY THE COAST RANGE OF NORTHWESTERN OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM MONDAY FOR THE LOWER COLUMBIA AND THE GREATER PORTLAND METRO AREA.
• A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM SUNDAY FOR CENTRAL DOUGLAS COUNTY , EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS,  JACKSON COUNTY, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES..

HEALTH ADVISORIES:

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Clear  tonight,
• Sunny and a bit warmer, Hot, Sunday, mostly clear Sunday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Monday afternoon, mostly clear at night,
• Mostly sunny and a bit cooler Tuesday, then clear Tuesday night.
• lows 54-57 cooling to 52 Tuesday night highs 93-84.
• Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Mostly sunny Thursday, mostly clear at night,
• Some AM clouds, mostly sunny and a bit cooler Friday afternoon, mostly clear Friday night,
• Some AM clouds, then sunny and a bit cooler Saturday afternoon.
• highs 85-79 lows 55-53 warming to 55 Saturday. (seasonal averages high 68 low 44)

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Home Wood Heating Advisory:

Posted Daily

Eugene-Springfield: GREEN– Burning is Allowed.

Oakridge: GREEN– Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Data courtesy of Lane Regional Air Protection Agency (LRAPA

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Eugene-Springfield Pollen Count:

Forecast for the Umpqua Valley including Roseburg:

• Clear tonight,
• Sunny and a bit warmer Sunday, mostly clear Sunday night,
• Mostly sunny and a bit cooler Monday, a slight (20%) chance of evening thunderstorms, just mostly clear late at night,
• Mostly sunny and a bit cooler Tuesday, then mostly clear Tuesday night.
• lows 60-62 cooling to 56 Tuesday night highs 98-87.
• Mostly sunny Wednesday and Thursday, mostly clear both nights,
• Mostly sunny and a bit cooler Friday, mostly clear Friday night,
• Then partly cloudy and a bit cooler Saturday.
• highs 87-80 lows near 56. (seasonal averages high 71 low 48)

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

• Clear tonight,
• Sunny and warmer Sunday, mostly clear Sunday night,
• Patchy AM coastal fog, sunny and cooler Monday afternoon, mostly clear in the evening, mostly cloudy late at night,
• Partly cloudy and a bit warmer Tuesday, then partly cloudy Tuesday night.
• lows 56-50 highs 85-66 warming to 68 Tuesday.
• Partly cloudy and a bit warmer Wednesday, partly cloudy Wednesday night,
• Then partly cloudy and a bit cooler Thursday through Saturday.
• highs 68-65 lows 50-52. (seasonal averages high 60 low 48)

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

• Clear tonight,
• Mostly sunny and a bit cooler Sunday with a slight (20%) chance of afternoon showers, partly cloudy with a slight (20%) chance of  showers Sunday night,
• Partly cloudy with a good (50%) chance of AM showers and a slight (20%) chance of thunderstorms, a good (50%) chance of showers and thunderstorms Monday afternoon, a slight (20%) chance of evening showers and thunderstorms,  just partly cloudy late at night,
• Mostly sunny start, partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday afternoon, then mostly clear Tuesday night.
• free air freezing level 14,000 ft. falling to 13,000 ft. late tonight, snow level above 8,000 ft. Sunday through Tuesday, then free air freezing level 12,000 ft. Tuesday  night.
• lows 45-47 cooling to 44 Tuesday highs 68-70.
• Mostly sunny and a bit warmer Wednesday and Thursday, mostly clear both nights,
• Mostly sunny and a bit warmer Thursday, mostly clear at night,
• Mostly sunny with a slight (20%) chance of showers Friday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Friday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers Saturday afternoon.
• free air freezing level 12,000 ft. Wednesday, 13,000 ft. Wednesday night through Thursday night, then snow level above 8,000 ft. Friday through Saturday.
• highs 74-76 cooling to 73 Saturday lows 45-48.