Here is my weekly weather quiz question for the last time. What is a “Hodograph“?  Here is the correct answer.  A Hodograph is a polar coordinate graph which shows the vertical wind profile of the lowest 7000 meters of the atmosphere. These plots are used to determine the advection patterns aloft, whether a thunderstorm will rotate, and the type of thunderstorms that you will likely see that day. I’ll have a new weekly weather quiz for you starting Monday.  The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs. Good luck.

_________________

An Upper Level High Pressure Ridge (Shaded “Arch” shape with arrows) is still controlling our weather with northwest airflow, but a disturbance tries to slip through. The graphics for days 1-3 show a frontal system that moved through the Pacific Northwest. The graphics for days 3-7  show a frontal system just offshore Wednesday and another that will push through Oregon next Friday.

Note: The Leonid Meteor Shower peaks this weekend. Best viewing out in the country away from the city lights.

________________

Air Quality Index:

Eugene/Springfield: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 34 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

________________

Advisories:

• AN AIR STAGNATION ADVISORY IS IN EFFECT FROM 7 AM SUNDAY UNTIL 1 PM NEXT WEDNESDAY FOR THE EASTERN COLUMBIA RIVER GORGE, THE LOWER COLUMBIA BASIN OF OREGON, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS, NORTH CENTRAL OREGON, AND CENTRAL OREGON.
• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 4 AM TUESDAY FOR THE SOUTH CENTRAL OREGON COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, THEN WESTERN, CENTRAL AND EASTERN LAKE COUNTY.

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

• Clear tonight,
• Sunny and a bit cooler Sunday and Monday, mostly clear both nights,
• Mostly sunny and a bit cooler Tuesday, then becoming mostly cloudy with a slight (20%) chance of rain late Tuesday night.
• low 32-30 warming to 39 Tuesday night highs 56-54.
• Mostly cloudy and a bit cooler with a good (50%) chance of rain Wednesday, cloudy with a good (50%) chance of rain Wednesday night,
• Mostly cloudy with rain Thursday (Thanksgiving Day), rain at night,
• Showers likely (70%) and a bit cooler Friday, a good (50%) chance of showers Friday night,
• Then cloudy with a good (50%) chance of rain Saturday.
• highs 52-49 lows near 42. (seasonal averages high 52 low 38)

_____

Home Wood Heating Advisory:

Posted Daily

Eugene-Springfield: YELLOW– Caution is Advised.

Oakridge: YELLOW– Caution is Advised.

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

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

_____

Your College Football Forecast    

Friday November 23rd: The Civil War Game

Ducks vs Beavers at Reser Stadium – Kickoff: 1:00 PM- PST – Too early for a preliminary weather forecast.

_________________

Forecast for Roseburg:

• Clear with patchy fog late tonight,
• Patchy AM fog, sunny and hazy and a bit warmer Sunday and Monday, clear and hazy Sunday night, mostly clear and hazy Monday evening and partly cloudy and hazy late at night,
• AM haze, partly cloudy Tuesday, then becoming mostly cloudy with a (30%) of rain Tuesday night.
• lows 40-37 warming to 43 Tuesday night highs near 60.
• Mostly cloudy and a bit cooler with rain likely (70%) Wednesday and at night,
• A bit cooler with rain Thursday (Thanksgiving Day) and Thursday night,
• Mostly cloudy with rain and a bit cooler Friday, then rain likely (70%) Friday night and Saturday.
• highs 54-50 lows near 45. (seasonal averages high 53 low 40)

_____________________

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

• Clear this evening, partly cloudy late tonight,
• Some AM clouds, sunny and a bit cooler Sunday afternoon with inland haze, mostly clear with coastal haze late at night while inland haze at night,
• Partly cloudy with patchy AM fog and haze, sunny and hazy Monday afternoon, mostly clear and hazy in the evening, partly cloudy and hazy late Monday night,
• Mostly cloudy and a bit cooler Tuesday, then rain likely (70%) chance of rain at night.
• lows 42-47 highs near near 60.
• Mostly cloudy with rain likely (70%) and a bit cooler Wednesday and at night,
• Rain and a bit cooler Thursday (Thanksgiving Day) and Thursday night,
• Mostly cloudy with rain Friday, then rain likely (70%) Friday night and Saturday.
• highs 57-55 lows near 50. (seasonal averages high 55 low 43)

________________

Forecast for the Cascades in Lane County:

• Clear tonight,
• Mostly sunny and a bit cooler Sunday and Monday, clear Sunday night, mostly clear both nights,
• Mostly sunny Tuesday, then mostly cloudy with a slight (20%) chance of rain and snow late Tuesday night.
• free air freezing level 12,000 ft. tonight through Sunday night, 11,000 ft. Monday, 11,000 ft. falling to 10,000 ft. late Monday night, 10,000 ft. Tuesday, then snow level 6,000 ft. Tuesday night.
• lows 27-33 highs near 50.
• Mostly cloudy with rain and snow likely (70%) and a bit cooler Wednesday and Wednesday night,
• Rain and snow likely (70%) and a bit cooler Thursday (Thanksgiving Day), rain and snow at night,
• Mostly cloudy with rain and snow showers and a bit cooler Friday, rain and snow showers likely (70%) Friday night,
• Then rain and snow likely (70%) and a bit warmer Saturday.
• snow level 5,500 ft. Wednesday and Wednesday night, 4,500 ft. Thursday and Thursday night, 4,000 ft. Friday and Friday night, then 3,500 ft. Saturday.
• highs 40-34 warming to 35 Saturday lows near 30.

________________