The upper airflow (look at the little arrows along the coast) is swinging around to start bringing warmer more moist air into Oregon. A frontal system is approaching the coast of California (see last frame of animation). It will move in and spread moisture northward over us. That sets up a situation that could produce some nasty weather conditions, especially when that air mass first gets here.

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Advisories: A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT  THROUGH 9 AM FRIDAY FOR THE SOUTH OREGON COAST. A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY AFTERNOON FOR THE NORTHERN COAST RANGE. ANOTHER IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY NIGHT FOR THE CENTRAL COAST RANGE, FROM FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON FOR THE FOOTHILLS OF THE NORTH CASCADES.. A WINTER STORM WATCH IS IN EFFECT FOR TH I-5 CORRIDOR FROM EUGENE NORTH FROM THIS EVENING THROUGH SATURDAY AFTERNOON..

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For the Willamette Valley: Mostly clear overnight tonight low 11-13. A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH  LATE FRIDAY NIGHT. Friday some AM clouds, then mostly cloudy in the afternoon with a slight (20%) chance of rain, freezing rain, and snow in the afternoon high 30-34,  mostly cloudy at night with a (50%) chance of rain and light freezing rain low 17-20. AM rain and light freezing rain likely (60%) Saturday high 33-36 then rain likely (60%)  Saturday night and it will be warmer low 33-35. Mostly cloudy Sunday with a (50%) chance of rain high 42-44. Mostly cloudy with a (50%) chance of rain Sunday night lows 35-37. Mostly cloudy with rain likely (60-70%) Monday night through Wednesday highs warming from 44-50 lows 34-39. Rain will be likely (60%) Wednesday night and a (50%) chance of showers Thursday low 36-39 high near 50.

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For the Umpqua Basin: Tonight partly cloudy and becoming mostly cloudy low 23-26. Friday mostly cloudy with a slight (20%) chance of snow in the morning (snow level 1,500′  in the afternoon) then snow likely (60%) in the afternoon, no accumulation expected high 36-40. Rain  (70%) Friday night (snow level 3,500′) and a bit warmer low 36-39. Rain (80% chance) Saturday and rain likely (60%) Saturday night (snow level 3,000′) high 39-43 low 35-39. Rain and and snow will be likely Sunday and snow showers likely Sunday night high 40-43 low 34-36. Rain will be likely (60%) Monday through Wednesday night highs warming 45-50 lows near 40. Thursday will be cloudy with a good (50%) chance of rain high in the low 50s.

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Forecast for the South Coast: Partly cloudy this evening, then mostly cloudy at night low 28-30. A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM FRIDAY. Mostly cloudy Friday with a slight (20%) chance of rain in the AM at the beaches chance of rain and snow inland rain likely (60%) in the afternoon high 47. Cloudy with rain Friday night low near 39-41. Rain (80%) Saturday and Saturday night high 48-50 low 44. Rain likely (60%) Sunday with showers (70%) Sunday night high 46-48 low near 40. Rain (70-80%) Monday through Wednesday night highs warming to the low to mid 50s lows low to mid 40s Thursday rain likely (60%) high 53-56.

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Advisory for the Cascade foothills of Lane County: A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON.

For the Cascades: The free air freezing level will be at the surface tonight going to 3,000′ in the afternoon Friday and then a snow level of 3,000′ Friday night, then a snow level of 3,500′ Saturday and  Saturday night, down to the surface Sunday, 2,500′  Sunday night. Monday the snow level will back up to 3,000′ ,Monday night 4,000′, and 5,000′ Tuesday, and 4,500′ Tuesday night and Wednesday . The snow level will rise to 5,000′ Wednesday night and Thursday.

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The weekly quiz question was correctly answered so the next quiz will start next Monday. To see the winner go back to the post where it was announced. A reminder for this week’s winner Tim to contact me about his prize.

The upper airflow (look at the little arrows along the coast) is swinging around to start bringing warmer more moist air into Oregon. A frontal system is approaching the coast of California (see last frame of animation). It will move in and spread moisture northward over us. That sets up a situation that could produce some nasty weather conditions, especially when that air mass first gets here.

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Advisories: A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY AFTERNOON FOR THE NORTHERN COAST RANGE. ANOTHER IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY NIGHT FOR THE CENTRAL COAST RANGE, FROM FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON FOR THE FOOTHILLS OF THHE NORTH CASCADES..  A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT  THROUGH 9 AM FRIDAY. A WINTER STORM WATCH IS IN EFFECT FOR TH I-5 CORRIDOR FROM EUGENE NORTH.

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For the Willamette Valley: Sunny skies today high 29-31 mostly clear overnight low 17-20. A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH  LATE FRIDAY NIGHT. Friday some AM clouds, then mostly cloudy in the afternoon with a (30%) chance of rain, freezing rain, and snow high 30-34,  mostly cloudy at night with a (50%) chance of rain and light freezing rain low 28-32. AM rain and light freezing rain likely (60%) Saturday then rain likely (60%) for the afternoon with a slight chance of freezing rain high 36-39.  Saturday night rain will be likely (60%) and it will be warmer low 34-36. Mostly cloudy Sunday with a (50%) chance of rain high 44-46. Mostly cloudy with a (50%) chance of rain Sunday night lows 38-43. Mostly cloudy with rain likely (60-70%) Monday through Wednesday highs warming from 44-50 lows 35-39.

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For the Umpqua Basin: Today will be sunny in the AM then partly cloudy by afternoon high 33-35.  Tonight partly cloudy low 26-28. Friday mostly cloudy with a good  (50%) chance of rain and snow in the morning (snow level 2,500′  in the afternoon)and a chance of rain in the afternoon high 36-40. Chance of rain  (70%) Friday night and a bit warmer low 36-39. Rain will be likely (60%) Saturday through Wednesday highs warming slowly from 45-50 lows in the upper 30s to low 40s.

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Forecast for the South Coast: Skies will be partly cloudy today high 42-44, then partly cloudy at night low 28-30. Mostly cloudy Friday with a chance of rain in the AM (snow level 500′) rain likely (60%) in the afternoon high 47. Cloudy with rain Friday night low near 39-43. Rain likely (60%) Saturday and Saturday night high 48-50 low 44. Showers likely Sunday with a chance of rain (70%) Sunday night low in the low 40s. Rain likely (60%) Monday through Wednesday highs 47-55 lows mid to upper 40s.

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For the Cascades: The free air freezing level will be at the surface today and tonight going to 2,500′ in the afternoon Friday and Friday night, then a snow level to the surface Saturday and 3,500′ Saturday night, down to the surface Sunday and Sunday night. Monday the snow level will back to 3,000′, 4,000′ Monday night, and 5,000′ Tuesday, and 4,500′ Tuesday night and Wednesday .

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The weekly quiz question was correctly answered so the next quiz will start next Monday. To see the winner go back to the post where it was announced. A reminder for this week’s winner Tim to contact me about his prize.

An upper level low (shaded area) is still bringing cold modified Arctic air through Canada to us. It will slowly slide to the south to California. The colder weather will last until the weekend, then it will warm up a bit and get wet. Friday night and Saturday morning could see a wintery mix of rain, freezing rain, and even light snow flurries continuing before changing to rain Saturday afternoon .

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For the Willamette Valley: There  will be a mix of clouds & sun today high 31-34 partly cloudy overnight low 13-18. Friday a mix of clouds and sun in the morning then mostly cloudy with a slight (20%) chance of rain high 34-37,  mostly cloudy at night with a (40%) chance of rain, light freezing rain, and snow mix low 28-30. AM rain and light freezing rain likely (60%) Saturday then rain likely for the afternoon high near 40.  Saturday night rain will be likely (60%) and it will be warmer low 34-36. Mostly cloudy Sunday with a (50%) chance of showers high 44-46. Mostly cloudy with a (50%) chance of rain Sunday night lows 37-40. Mostly cloudy with rain likely (60-70%) Monday through Wednesday highs 44-50 lows 35-40.

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For the Umpqua Basin: Today will be sunny in the AM then partly cloudy by afternoon high 36-42.  Thursday night mostly cloudy low 24-27. Friday mostly cloudy with a slight (20%) chance of rain and snow (snow level 3,000′ in the afternoon high 36-40. Chance of rain  (50%) Friday night and a bit warmer low 36-39. Rain will be likely Saturday through Wednesday highs warming slowly from 45-50 lows in the upper 30s to near 40.

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Advisories: For the South Oregon Coast:  A FREEZE WARNING IS IN EFFECT  UNTIL 9 AM TODAY. FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT THROUGH 9 AM FRIDAY  .

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Forecast for the South Coast: Skies will be partly cloudy today high 42-44, then mostly cloudy at night low 34-36. Mostly cloudy Friday with a  slight (20%) chance of rain at the shore, but a 30% chance of rain/snow mix inland high 47. Mostly cloudy rain likely (60%) and not as cool Friday night low near 39-43. Rain likely Saturday, Saturday night, and Sunday high 48-50 low 42. Chance of rain (50%) Sunday night low in the low 40s. Rain likely (60%) Monday through Wednesday highs 50-54 lows near 45.

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For the Cascades: The free air freezing level will be at the surface today going to 2,500′ this afternoon, then back to the surface after midnight. The snow level will be at 2 ,500′ Friday,  and at 3,000′ Friday night a winter mix of rain, snow, & freezing rain the snow level will be at 3,500′. The snow level will be at 3,500′  Saturday and Saturday night, down to the surface Sunday and Sunday night. Monday the snow level will back to 3,000′, 4,000′ Monday night, and 5,000′ Tuesday, and 4,500′ Tuesday night and Wednesday .

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The weekly quiz question was correctly answered so the next quiz will start next Monday. To see the winner go back to the post where it was announced.

An upper level low (shaded area) is still bringing cold modified Arctic air through Canada to us. The colder weather will last until the weekend, then it will warm up a bit and get wet. Friday night and Saturday morning could see a wintery mix of rain, freezing rain, and even light snow flurries continuing before changing to rain Saturday afternoon .

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For the Willamette Valley: Mostly sunny  and cold today high 28-32 and mostly clear and not quite as cold overnight  low 11-14. There  will be a mix of clouds & sun Thursday high 31-34 partly cloudy overnight low 13-18. Friday a mix of clouds and sun high 33-35,  mostly cloudy at night with a (50%) chance of rain, light freezing rain, and snow mix low 28-30. Mostly cloudy and warmer Saturday with a (60%) chance of rain, freezing rain, and snow flurries in the morning then rain likely for the afternoon high near 40.  Saturday night rain will be likely and it will be warmer low 34-36. Mostly cloudy Sunday with a (50%) chance of showers high 44-46. Mostly cloudy with a (50%) chance of rain Sunday night through Tuesday highs 45-50 lows 38-42.

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For the Umpqua Basin:  Sunny today and clear tonight high 32-35 low 17-20. Thursday sunny in the AM then partly cloudy by afternoon high 34-38 . Thursday night mostly cloudy low 24-27. Friday mostly cloudy with a (30%) chance of rain (snow level 2,500′ rising to 3,500’in the afternoon high low to mid 40s.  Rain or showers will be likely (60%) Friday night through Tuesday highs mid to upper 40s to near 50 by Tuesday lows near 40.

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Advisories: For the South Oregon Coast:  A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM THURSDAY. FREEZE WATCH IS IN EFFECT THURSDAY EVENING THROUGH FRIDAY MORNING .

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Forecast for the South Coast: Skies will be sunny today and mostly clear tonight high 35-39 low 22-25. Thursday partly cloudy n the AM, then mostly cloudy at night high rising to the low 40s low in the mid 20s. Mostly cloudy Friday with a  (30%) chance of rain high 47. Mostly cloudy rain likely (60%) and not as cool Friday night low near 37-39. Rain Saturday and  Saturday night high 48 low 42. Showers likely (60%) Sunday high 49-51. Chance of showers(50%) Sunday night low in the low 40s. Rain likely (60%) Monday and Monday night high in the low 50s low near 45. Rain likely (60% Tuesday high in the mid 50s.

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For the Cascades: The free air freezing level will be at the surface today through  Thursday night, 3,000′ Thursday night, 3,500′, Friday, Friday night a winter mix of rain, snow, & freezing rain the snow level will be at 3,500′. The snow level will be at 3,500′  Saturday and  Saturday night & 3,000′ Sunday and Sunday night. Monday the snow level will rise to 4,000′, 5,000′ Monday night and 6,500′ Tuesday.

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The weekly quiz question was correctly answered so the next quiz will start next Monday. To see the winner go back to the post where it was announced.

An upper level low (shaded area) is still bringing cold modified Arctic air through Canada to us. The colder weather will last into the weekend, but it will slowly warm up a bit.

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For the Willamette Valley: Look for a mix of clouds and sun today high near 29-32. Partly cloudy at night low still very cold near 10-13. Wednesday mostly sunny  high 30-33 and mostly clear and not quite as cold overnight  low 16-20. There  will be a mix of clouds & sun Thursday high 33-35 partly cloudy overnight low 17-19. Friday partly cloudy high near 40 mostly cloudy at night with a (40%) chance of rain and light freezing rain low 28-30. Mostly cloudy and warmer Saturday with a (60%) chance of rain and freezing rain in the morning with afternoon rain likely (60% chance) high near 45.  Saturday night through Monday will be mostly cloudy with rain likely (60%) chance of rain lows 35-38 high 44-46.

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For the Umpqua Basin: Partly cloudy in the AM Today then sunny this afternoon high in the low to mid mid 30s mostly clear at night low near 14-16. Sunny Wednesday morning and then partly cloudy high 36-38 low 16-18. Thursday partly cloudy in the AM then mostly cloudy by afternoon high 37-42 . Thursday night mostly cloudy low in the low 30s. Friday mostly cloudy with a (50%) chance of rain high low to mid 40s.  Rain will be likely (60%) Friday night through Monday highs mid to upper 40s lows near 40.

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Advisories: For the South Oregon Coast:   A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM WEDNESDAY. A FREEZE WATCH IS IN EFFECT WEDNESDAY EVENING THROUGH THURSDAY MORNING .

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Forecast for the South Coast: Skies will be sunny today and mostly clear tonight high 34-37 low 20-23. Sunny  Wednesday highs will be in the low 40s and low near 30. Thursday partly cloudy n the AM, then mostly cloudy at night high rising to the mid 40s. Mostly cloudy Friday with a (70%) chance of rain high 47. Mostly cloudy rain and breezy Friday night through Saturday night high 48 low 42. Rain likely (60%) Sunday through Monday high in the low 50s low near 45.

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For the Cascades:  The free air freezing level will be at the surface today through Wednesday night, staying below pass levels through Thursday. The free air freezing level will be at 2,500′ Thursday night & Friday, 3,500′ Friday night. The snow level will be at 4,000′  Saturday and  Saturday night & 3,500′ Sunday. The level will be at 4,500′ Sunday night and 4,000′ Monday.

An upper level low (shaded area) is bringing cold Arctic air through Canada to us. A colder blast of Arctic air is moving in from the North producing  maybe a few snow flurries, but again no accumulation expected, so far anyway. The colder weather will last well into next week.

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For the Willamette Valley: Today will see mostly sunny skies but cold  high right around freezing at 30-33, then mostly clear and even colder at night low in the low teens. A mix of clouds and sun again Tuesday high near 33-35. Partly cloudy at night low still in the teens near 17. Wednesday mostly sunny  high 35-38 and mostly clear and not quite as cold overnight  low 23-26. There  will be a mix of clouds & sun Thursday high 37-40 low 24-29. Friday a mix of clouds & sun high near 40 mostly cloudy at night with a (40%) chance of rain or snow low 28-30. Mostly cloudy and warmer with a (50%) chance of rain  Saturday high near 45.  Saturday night and Sunday will be mostly cloudy with a (50%) chance of rain low 38 high 42-44.

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For the Umpqua Basin: Mostly cloudy this morning then partly cloudy this afternoon high low to mid 30s . Partly cloudy this evening and clearing later low 15-20. Sunny in the AM Tuesday then partly cloudy high in the mid 30s partly cloudy at night low near 20. Partly cloudy Wednesday and Thursday highs 30s to 40s lows in the mid 20s. Thursday night a slight (20%) chance of rain or snow showers low low to mid 30s. Friday mostly cloudy with a (50%) chance of showers high low to mid 40s  Rain will be likely (60%) Saturday through Sunday highs low to mid 40s lows low to mid 30s.

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Advisories: For the South Oregon Coast:  A FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT  THROUGH 9 AM TUESDAY. A FREEZE WATCH IS IN EFFECT TUESDAY EVENING THROUGH WEDNESDAY MORNING .

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Forecast for the South Coast: Skies will be partly cloudy today through Tuesday morning, Mostly cloudy Tuesday afternoon, partly cloudy Wednesday through through Thursday. Highs will be in the mid 40s and lows in the mid to upper 20s through Thursday, rising to highs near 50 and lows from the low 30s warming to upper 30s Friday through Monday. Mostly cloudy with a slight (20%) chance of showers Thursday night, (60%) chance of showers Friday, then a 70% chance of rain Saturday through Sunday.

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For the Cascades:  The snow level will be at the surface today then a free air freezing level at the surface through Tuesday night, staying below pass levels through Thursday night. Friday through Sunday it will be a snow level below the passes with rain and snow likely for Saturday and Sunday.

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Here is my weather quiz question for this week. I picked this one because of our colder than normal temperatures. What time zone or zones help to tell the time at both the North and South Poles? Please place your question as a comment after this post. The first person to post the correct answer  will win one free week of personalized forecasts tailored to your needs. Good luck.