Here is my weekly weather quiz question for the last time. What is “Latent Heat Flux?” Here is the correct answer. Latent Heat Flux is the flux of heat from the earth’s surface to the atmosphere that is associated with evaporation or condensation of water vapor at the surface; a component of the surface energy budget. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

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A large upper level low (Shaded U shape with blue arrows) continues to send frontal systems at us. A frontal system pushed into the Pacific Northwest dropping well over an inch of rain throughout the area already. There will be a brief break from the rain late Monday morning and early afternoon, then the rain returns.  A parade of storms is still out there. One will hit late today and tonight while another frontal system will slide into Oregon Thursday. Wait there is more! We will see another frontal system come through between Friday night and Saturday afternoon.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 68 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A HIGH WIND WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY, AND CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT THROUGH MIDNIGHT TONIGHT FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 4 AM MONDAY  FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.

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

• Mostly cloudy with showers this evening, partly cloudy with patchy fog and a slight (20%) chance of showers late tonight (0.10 in. of rain possible),
• Partly cloudy in the AM, cloudy with a slight (20%) chance of rain (under 0.10 in. of rain possible) Monday afternoon (Martin Luther King, Jr. Day), rain Monday night (0.50 in. of rain possible) and Tuesday (0.50 in. of rain possible), showers at night (0.15 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Wednesday AM, a good (50%) chance of rain in the afternoon, then rain Wednesday night.
• lows 42-44 highs near 49.
• Mostly cloudy and a bit warmer with rain Thursday, rain likely (60%) Thursday night and Friday (a bit cooler), showers likely (70%) at night,
• Rain likely (70%) Saturday, cloudy with a (40%) chance of showers Saturday night,
• Then mostly cloudy with a good (50%) chance of showers Sunday.
• highs 53-47 lows 43-38. (seasonal averages high 48 low 34)

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN- Burning is Allowed.

Oakridge:  GREEN- Burning is Allowed.

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

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Cloudy with rain likely (60%) this evening,  a good (50%) chance of showers late tonight (under 0.10 in. of rain possible),
• Partly cloudy in the AM, mostly cloudy with a slight (20%) chance of rain (under 0.10 in. of rain possible) Monday afternoon (Martin Luther King, Jr. Day), rain Monday night (0.20 in. of rain possible) and Tuesday (0.25 in. of rain possible), showers at night (0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of rain Wednesday, then  rain Wednesday night.
• lows 42-40 warming to 48 Wednesday night highs near 52.
• Mostly cloudy with rain Thursday, rain likely (60%) Thursday night through Friday night,
• Showers likely (70%) Saturday, cloudy with a (30%) chance of showers at night,
• Then mostly cloudy with a good (50%) chance of rain Sunday.
• highs 54-49 lows 44-40. (seasonal averages high 50 low 37)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Cloudy with evening coastal rain likely (70%) with a slight (20%) chance of thunderstorms and a good (50%) chance of  showers late tonight while evening inland showers likely (70%) with a slight (20%) chance of inland showers late tonight (under 0.10 in. of rain possible),
• Partly cloudy Monday AM inland and cloudy with a good (50%) chance of afternoon rain while coastal rain (under 0.10 in. of rain possible) and a bit cooler in the afternoon (Martin Luther King, Jr. Day), rain Monday night (0.60 in. of rain possible),
• Rain Tuesday (0.75 in. of rain possible) and breezy (Wind: SE 10-20 mph at the shore increasing to S 20-30 mph in the afternoon while S 10-20 mph inland gusts to 40 mph in the afternoon), evening showers, then showers likely (70%) late Tuesday night (0.15 in. of rain possible),
• Mostly cloudy with a (40%) chance of rain Wednesday, then rain Wednesday night.
• lows 45-47 cooling to 44 Tuesday night warming to  53 Wednesday night highs 55-53 warming back to 55 Wednesday.
• Mostly cloudy with rain Thursday, rain likely (70%) Thursday night through Friday night,
• Showers Saturday, cloudy with a (40%) chance of showers Saturday night,
• Then rain likely (60%) Sunday.
• highs 56-52 lows 48-44. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening showers,  becoming partly  cloudy with a (%) chance of snow showers tonight (0.25 in. of rain possible, 1-3 in. of snow possible),
• A mix of clouds and sun and a bit cooler Monday (Martin Luther King, Jr. Day), becoming mostly cloudy with rain and snow Monday night (0.50 in. of rain possible, 2-4 in. of snow possible),
• Rain and snow Tuesday and in the evening, rain and snow showers late Tuesday night and breezy (Wind: SW 15-25 mph gusts to 40 mph decreasing to SW 10-15 mph gusts to 30 mph late at night),
• Mostly cloudy with a slight (20%) chance of rain and snow showers Wednesday AM, a good (50%) chance of rain and snow in the afternoon, then rain likely (70%) at night.
• snow level 6,000 ft. falling to 4,500 ft. late tonight, 5,000 rising to 6,000 ft. Monday afternoon, 4,500 ft. Monday night, 5,000 ft. Tuesday, 4,000 ft. Tuesday night and Wednesday, then 6,000 ft. Wednesday night.
• lows 27-30 cooling back to 27 Tuesday night warming to 33 Wednesday night highs near 36.
• Rain and a bit warmer Thursday, rain likely (70%) Thursday night and Friday (a bit cooler), rain and snow showers likely (70%) Friday night,
• Mostly cloudy and cooler with rain and snow likely (70%) Saturday, cloudy with a good (50%) chance of rain and snow showers at night,
• Then mostly cloudy with a (40%) chance of rain and snow showers Sunday.
• snow level 8,000 ft. Thursday, 6,500 ft. Thursday night and Friday, 5,000 ft. Friday night, 3,500 ft. Saturday and at night, then 4,000 ft. Saturday.
• highs 40-32 lows 30-25.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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