________________

It’s time for my new weekly weather quiz question. Here it is. What is a blocking ridge?  Please post your answer as a comment by clicking on “no 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.

________________

The jet stream shows a high pressure ridge (shaded “arch” shape) is aiming the airflow straight South toward the Pacific Northwest.  A frontal system slipped in from the Northwest bringing the chance of rain and a second front is moving down behind it to dry us off and cool the temperatures a bit. Yet another ridge will start to build in and that will keep us under a relatively calm weather pattern through the rest of the week. Remember that, particularly this time of the year, often when it’s not raining it is usually fogging. The next major frontal system should move in between next Friday and Saturday.

________________

Advisories:  A FROST ADVISORY IS IN EFFECT  FROM 2 AM UNTIL 8  AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON COAST.

________________

Here are your detailed forecasts. **

_________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with a slight (20%) chance of AM showers, mostly cloudy with some sun breaks this afternoon, partly cloudy tonight with patchy fog late and early Wednesday AM, a mix of clouds and sun Wednesday afternoon, and partly cloudy Wednesday night with areas of fog late at night and Thursday AM, a mix of clouds and sun Thursday afternoon, then partly cloudy with patchy fog Thursday night highs 47-53 lows 29-35. Partly cloudy with a slight (20%) chance of rain Friday, a good (50%) chance of rain Friday night, mostly cloudy with rain likely (60%) Saturday, then a good (50%) chance of rain Saturday night and (40%) Sunday through Monday highs 55-49 lows 40-33. (seasonal  averages high 50low 34)

________________

Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with a (30%) chance of scattered rain and snow showers this AM, a slight (20%) chance of isolated rain and snow showers in the afternoon , partly cloudy with patchy fog late tonight and Wednesday AM, sunny in the afternoon,  mostly clear Wednesday night with areas of fog and freezing fog , mostly clear Wednesday night, areas of fog and freezing fog late Wednesday night and Thursday AM, partly cloudy Thursday and Thursday night with patchy fog late night and early Friday AM, mostly cloudy Friday, a  slight (20%) chance of rain Friday night highs 46-59 lows 32-42. Mostly cloudy with rain likely (60%) Saturday through Sunday, mostly cloudy with a slight (20%) chance of rain Sunday night and Monday highs 57-50 lows 38-33. (seasonal averages high 54 low 36)

_______________

Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a (30%) chance of  scattered showers this AM (snow level 2,000 ft. early AM) and a (30%) chance of isolated inland showers this afternoon, mostly cloudy this afternoon, partly cloudy this evening, mostly clear with areas of patchy fog tonight and Wednesday AM, sunny Wednesday afternoon, mostly clear with areas of fog late Wednesday night, sunny Thursday, mostly clear Thursday night, mostly cloudy Friday, then mostly cloudy with a (30%) chance of rain Friday night highs 46-58 cooling to 55 Friday lows 34-44. Mostly cloudy with rain likely (60%) Saturday through Sunday, a (30%) chance of rain Sunday night, and mostly cloudy with a slight (20%) chance of rain Monday highs 54-49 lows 44-40. (seasonal averages high 54 low 41).

_________________

Forecast for the Cascades of Lane County: Mostly cloudy with snow showers likely (60%) this AM, partly cloudy with a slight (20%) chance of snow showers this afternoon (1 in. of snow possible), partly cloudy tonight, mostly sunny Wednesday and Thursday, mostly clear Wednesday night, partly cloudy Thursday night, mostly cloudy with a slight (20%) chance of rain Friday, a (40%) chance of rain Friday night snow level at the surface today, free air freezing level 2,500 ft. tonight, 4,000 ft. Wednesday, 6,500 ft. Wednesday night, 8,000 ft. Thursday, 9,000 ft. Thursday night, snow level  8,000 ft. Friday, and 6,000 ft. Friday night highs 32-46 lows 20-32. Mostly cloudy with snow and rain likely (60%) Saturday,  a good (50%) chance of rain and snow Saturday night, a (40%) chance of show Sunday, mostly cloudy with a (40%) chance of rain and snow Sunday night, and mostly cloudy with a (40%) chance of rain Monday snow level 4,500 ft. Saturday, and 3,500 ft. Saturday night, 2,500 ft. Sunday, 4,000 ft. Sunday night, and 5,500 ft. Monday highs 37-42 lows near 25.

_________________

**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.