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March 21, 2023

Note: Weather is a constantly changing phenomenon and weather forecasting is a combination of science, experience, and intuition. The accuracy of any given forecast can chance due to unexpected changes in atmospheric conditions, so there are no guarantees the the actual weather will conform to the projected forecast.

ADVISORIES

  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 2,500 FT. FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 2,000 FT. FOR THE NORTHERN OREGON CASCADE FOOTHILLS AND THE CASCADE FOOTHILLS IN LANE COUNTY.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 1,500 FT. FOR THE COAST RANGE OF NORTHWEST  OREGON AND THE CENTRAL COAST RANGE OF WESTERN OREGON.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 3,500 FT. FOR THE EAST SLOPES OF THE OREGON CASCADES.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON FOR THE SOUTH CENTRAL THE OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 2,500 FT. FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS.
  • A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON ABOVE 2,500 FT. FOR THE EASTERN CURRY COUNTY AND JOSEPHINE COUNTY.

HEALTH ADVISORIES

A PERMANENT RECREATIONAL HEALTH ADVISORY IS IN EFFECT FOR THE SOUTH UMPQUA RIVER AND MAINSTEM UMPQUA RIVER. THE ADVISORY COVERS THE SOUTH UMPQUA RIVER FROM CANYONVILLE DOWNSTREAM TO THE CONFLUENCE OF THE MAINSTEM UMPQUA RIVER, AND THE MAINSTEM UMPQUA RIVER DOWNSTREAM PAST ELKTON TO LAWSON BAR. PEOPLE IN THE BEDROCK ALONG THE RIVERS EDGE ARE ARE KNOWN TO DEVELOP CYANOBACTERIA (BLUE-GREEN ALGAE) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED AT SEVERAL ACCESS AREAS ALONG THE RIVER.

THE WEATHER PATTERN

An Upper Level Low Pressure Trough (“U” shape) is approaching the Pacific Northwest and the Atmospheric River remains well to the south moving over central and southern California. The graphics for days 1-3 show a frontal system moving our way Thursday. The graphics for days 3-7 show an increase in complex frontal systems moving our way Friday through next Tuesday continuing the rain chances.

Forecast for the South Willamette Valley including Eugene-Springfield:

  • Partly cloudy with patchy frost late tonight,
  • Clouds and sun with patchy AM frost and a slight (20%) chance of showers, a mix of clouds and sun and a bit cooler with showers Wednesday afternoon (under 0.10 in. of rain possible), increasing clouds with evening showers and a slight (20%) chance of thunderstorms, mostly cloudy with showers likely (70%) late Wednesday night (under 0.10 in. of rain possible, more in storms),
  • Mostly cloudy with showers and a bit cooler Thursday (0.25 in. of rain possible), showers with a slight (20%) chance of thunderstorms possible, snow showers late at night (0.25 in. of rain possible, snow level 1,000 ft., small hail possible),
  • Mostly cloudy with AM showers and snow showers, showers and a slight (20%) chance of thunderstorms a bit cooler Friday afternoon (snow level 1,500 ft., small hail possible), then showers with snow showers likely (70%) late Friday night (snow level 500 ft.).
  • lows 34-40 cooling to 33 Friday night highs 58-45.
  •  Mostly cloudy with AM showers and snow showers, showers and a bit warmer Saturday afternoon (snow level 1,000 ft.), a good (50%) chance of evening showers, partly cloudy with a slight (20%) chance of showers and snow showers late Saturday night (snow level 1,000 ft.),
  • Mostly cloudy with a good (50%) chance of AM rain and snow showers, a good (50%) chance of showers and a bit warmer Sunday afternoon (snow level 1,500 ft.), a good (50%) chance of showers at night,
  • Mostly cloudy with a good (50%) chance of AM showers and snow showers, a bit warmer with a good (50%) chance of showers Monday afternoon (snow level 1,500 ft.), a (30%) chance of evening showers, a slight (20%) chance of rain and snow showers late Monday night,
  • Partly cloudy with a slight (20%) chance of AM showers, then a (30%) chance of showers and a bit warmer Tuesday afternoon.
  • highs 46-55 lows near 32. (seasonal averages high 58 low 38)

Forecast for the Umpqua Valley including Roseburg:

  • Partly cloudy with patchy fog tonight,
  • Mostly cloudy with patchy AM fog and showers likely (70%), showers and a slight (20%) chance of thunderstorms a bit cooler Wednesday afternoon and evening (under 0.10 in. of rain possible), a good (50%) chance of rain and snow showers at night (under 0.10 in. of rain possible, snow level 3,500 ft. falling to 2,5oo0 ft. late at night),
  • Mostly cloudy with rain and snow showers and a bit cooler Thursday (0.25 in. of rain possible, snow level 2,500 ft.), showers and snow showers with a slight (20%) chance of thunderstorms Thursday night (0.10 in. of rain possible, snow level 1,500 ft.),
  • Mostly cloudy with AM rain and snow showers, a bit cooler with showers, snow showers and a slight (20%) chance of thunderstorms Friday afternoon, evening rain and snow showers, then snow showers late Friday night.
  • lows 37-42 cooling to 34 Friday night highs 57-46.
  • Mostly cloudy with AM snow showers, rain and snow showers and a bit warmer Saturday afternoon, a good (50%) chance of rain and snow showers Saturday night,
  • Mostly cloudy with a good (50%) chance of rain and snow showers and a bit warmer Sunday and in the evening, rain and snow showers likely (70%) late Sunday night,
  • Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Monday, a (30%) chance of rain and snow showers Monday night,
  • Then mostly cloudy and a bit warmer with a (30%) chance of rain and snow showers Tuesday.
  • highs 47 -56 lows near 34. (seasonal averages high 60 low 40)

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

  • Becoming mostly cloudy with a slight (20%) chance of coastal showers late tonight while inland patchy fog tonight beginning late this evening,
  • Mostly cloudy with a slight (20%) chance of AM coastal showers and a bit cooler with coastal showers likely (70%) Wednesday afternoon while patchy AM inland fog and inland showers likely (70%) Wednesday (under 0.10 in. of rain possible), coastal evening showers likely (70%) with coastal showers late at night while inland evening showers and inland showers likely (70%) late Wednesday night (under 0.10 in. of rain possible),
  • Mostly cloudy with AM coastal showers with coastal showers and a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon while inland showers Thursday (0.25 in. of rain possible, snow level 2,000 ft.), coastal showers with a slight (20%) chance of thunderstorms at night while inland snow showers and a slight (20%) chance of thunderstorms at night (0.25 in. of rain possible),
  • Mostly cloudy with rain showers and snow showers with a slight (20%) chance of thunderstorms and a bit cooler Friday afternoon, then rain and snow showers Friday night.
  • lows 36-38 cooling to 33 Friday night highs 52-47.
  • Mostly cloudy with AM rain and snow showers, showers Saturday afternoon, a (50%) chance of rain and snow showers Saturday  night,
  • Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers likely (70%) and a bit warmer Sunday afternoon, rain and snow showers likely (70%) at night,
  • Mostly cloudy with rain and snow showers likely (70%) and a bit warmer Monday, a (40%) chance of showers Monday night,
  • Mostly cloudy with a (40%) chance of AM rain and snow showers, then a (30%) chance of rain and a bit warmer Tuesday afternoon.
  • highs 47-45 lows 32-34. (seasonal averages high 55 low 42)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Partly cloudy tonight,
  • AM clouds and sun with a good (50%) chance of showers,  showers with snow showers likely (70%) and a bit cooler with a slight (20%) chance of thunderstorms Wednesday afternoon and evening (0.25 in. of rain possible, 1 in. of snow possible, evening snow possibly heavy at times), snow and rain showers late Wednesday night (0.50 in. of rain possible, 2-5 in. of snow possible),
  • Mostly cloudy with snow showers and a bit cooler Thursday afternoon (snow possibly heavy at times) and breezy (Pass Wind: SW 10-15 mph gusts to 30 mph increasing to SW 15-25 mph afternoon gusts to 40 mph), snow showers (possibly heavy at times) and breezy (Pass Wind: W 15-25 mph gusts to 35 mph),
  • Mostly cloudy and a bit cooler with snow showers Friday and a slight (20%) chance of afternoon thunderstorms (small hail possible, snow possibly heavy at times, then snow showers with brisk wind Friday night (snow possibly heavy at times in the evening),
  • free air freezing level 6,000 ft. falling to 5,000 ft. late tonight, snow level 3,500 ft. rising to 4,500 ft. Wednesday afternoon, 4,000 ft. falling to 3,000 ft. late Wednesday night, 2,500 ft. Thursday, then at the surface Thursday night through Friday night.
  • lows 24-26 cooling to 18 Friday night highs 39-27.
  • Mostly cloudy with snow showers Saturday, evening snow showers likely (70%), a good (50%) chance of snow showers late Saturday night,
  • Mostly cloudy with a good (50%) chance of AM snow showers, snow showers likely (70%) and a bit warmer Sunday afternoon, a good (50%) chance of evening rain and snow showers, partly cloudy with a good (50%) chance of snow showers late at night,
  • Mostly cloudy with a good (50%) chance of AM snow showers, snow showers likely (70%) and a bit warmer Monday afternoon, a good (50%) chance of evening showers, a good (50%) chance of snow showers late Monday night,
  • Clouds and sun with a (40%) chance of AM snow showers, then a mix of clouds and sun and a bit warmer with a (40%) chance of showers Monday afternoon.
  • snow level at the surface Saturday through Sunday, 1,500 ft Sunday night, 2,000 ft. Monday and Monday night, then 3,000 ft. Tuesday.
  • highs 27-36 lows 17-19.

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  • For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com

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10/31 Showers with patchy fog overnight.

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_____

  • For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com

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Mostly clear again tonight, then sunshine and slightly cooler for your Friday.

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

  • Becoming mostly cloudy late tonight,
  • Some AM clouds, sunny and a bit warmer Friday afternoon, clear in the evening, partly cloudy late Friday night,
  • Mostly cloudy start, partly cloudy and slightly cooler Saturday afternoon, mostly clear at night,
  • Mostly sunny Sunday, then mostly clear Sunday night.
  • lows 54-56 cooling back to 54 Sunday night highs 70-69.
  • Mostly sunny and a bit warmer Monday, mostly clear Monday night,
  • Partly cloudy and slightly cooler Tuesday, partly cloudy at night,
  • Then partly cloudy Wednesday through Thursday.
  • highs 73-72 lows 54-56 cooling back to 54 Wednesday night. (Seasonal Averages high 66 low 54)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly clear tonight,
  • Mostly sunny and a bit cooler Friday, clear Friday night,
  • Sunny and a bit warmer Saturday, mostly clear at night,
  • Some AM clouds, mostly sunny and a bit cooler Sunday, then clear Sunday night.
  • free air freezing level 15,000 ft. falling to 14,000 ft. late tonight, 14,000 ft. rising to 15,000 ft. Friday afternoon, 15,000 ft. Friday night through Sunday, then 16,000 ft. Sunday night.
  • lows 49-47 highs 74-72 warming back to 74 Sunday.
  • Sunny and a bit warmer Monday, clear Monday night,
  • Sunny Tuesday, mostly clear at night,
  • Then mostly sunny and a bit cooler Wednesday and Thursday, mostly clear Wednesday night.
  • free air freezing level 16,000 ft. Monday through Thursday.
  • highs 80-75 lows 53-50.