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March 2, 2024

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 WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM SUNDAY ABOVE 1,000 FT. FOR THE COAST RANGE OF NORTHWEST OREGON AND THE CENTRAL COAST RANGE OF WESTERN OREGON.
  • A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 PM SUNDAY ABOVE 1,500 FT. FOR THE NORTHERN OREGON CASCADE FOOTHILLS AND THE CASCADE FOOTHILLS IN LANE COUNTY.
  • A WINTER STORM WATCH IS IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY AFTERNOON ABOVE 4,500 FT. FOR THE KLAMATH BASIN.
  • A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM SUNDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
  • A WINTER STORM WATCH IS IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY AFTERNOON ABOVE 4,500 FT. FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
  • A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM SUNDAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY.
  • A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM SUNDAY ABOVE 2,000 FT. FOR CENTRAL DOUGLAS COUNTY AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
  • A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM SUNDAY ABOVE 2,000 FT. FOR JACKSON COUNY.
  • A FLOOD WARNING IS IN EFFECT UNTIL JUST AFTER MIDNIGHT TONIGHT FOR THE COQUILLE RIVER AT COQUILLE AFFECTING COOS COUNTY.

HEALTH ADVISORIES

  • A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE  RIVER.

THE WEATHER PATTERN:

The Jet Stream will be bringing us colder air from the northwest with an Upper Level High Pressure Ridge (“Arch” shape) moving over the the Pacific Northwest.  The graphics for days 1-3  show no frontal systems over the Pacific Northwest. The graphics for days 3-7    Wednesday through Sunday show increasing frontal activity through the period.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly cloudy with evening rain showers and snow showers likely (70%) with a slight (20%) chance of thunderstorms, rain showers with a slight (20%) chance of thunderstorms late tonight (0.25 in. of rain possible, more in thunderstorms, 1 in. of snow possible, snow level 500 ft.),
  • Mostly cloudy with AM snow showers and a slight (20%) chance of thunderstorms, slightly warmer with showers and a slight (20%) chance of thunderstorms Sunday afternoon (snow level 500 ft.), evening rain showers and a slight (20%) chance of snow showers with a slight (20%) chance of thunderstorms, rain showers and a slight (20%) chance of snow showers Sunday night (0.25 in. of rain possible, more in storms, snow level 1,000 ft.),
  • Mostly cloudy with AM rain showers and a slight (20%) chance of snow showers and a slight (20%) chance of thunderstorms, showers and slightly cooler Monday afternoon (AM snow level 1,000 ft.), evening showers, a good (50%) chance of rain and snow showers at night (snow level 1,000 ft.),
  • A mix of clouds and sun with a good (50%) chance of rain with snow showers Tuesday (snow level 1,000 ft.), then just partly cloudy Tuesday night.
  • lows 32-26 highs 46-45.
  • Partly cloudy and a bit warmer with a (40%) chance of snow showers Wednesday (snow level 500 ft.), partly cloudy with a slight (20%) chance of evening rain and snow showers, mostly cloudy with a slight (20%) chance of rain and snow showers late Wednesday night (snow level 1,000 ft),
  • A mix of clouds and sun and a bit warmer with a (40%) chance of rain and snow showers Thursday (snow level 1,000 ft.), partly cloudy with a slight (20%) chance of showers at night,
  • A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Friday, mostly cloudy with a good (50%) chance of showers Friday night,
  • Then mostly cloudy with a good (50%) chance of showers Saturday.
  • highs 46-55 lows 29-37. (seasonal averages high 55 low 36)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with rain showers, snow showers likely (70%) and a slight (20%) chance of thunderstorms through late evening, a good (50%) chance of rain showers, snow showers and a slight (20%) chance of thunderstorms late tonight (under 0.10 in. of rain possible, 2-3 in. of snow possible, snow level 600 ft. ),
  • Mostly cloudy with rain showers, snow showers and a slight (20%) chance of thunderstorms and a bit cooler Sunday (1 in. of snow possible lower elevations and 2-3 in. of snow possible above 1,500 ft., snow level 700 ft. rising to 1,500 ft. in the afternoon), rain showers, snow showers with a slight (20%) chance of thunderstorms late Sunday night (1 in., of snow possible lower elevations and 2-3 in. of snow possible above 1,500 ft. ,snow level 1,000 ft. at night),
  • Mostly cloudy with rain showers, snow showers and a slight (20%) chance of thunderstorms Monday (snow possibly heavy at times, snow level 1,000 ft. rising to 2,500 ft. in the afternoon), evening rain and snow, rain and snow showers likely (70%) late at night (snow level 1,500 ft. falling to 1,000 ft. late at night),
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow Tuesday, then partly cloudy with a slight (20%) chance of rain and snow Tuesday night.
  • lows 32-34 cooling to 28 Tuesday night highs 44-46.
  • Mostly cloudy and a bit warmer with a slight (20%) chance  of rain and snow Wednesday and Wednesday night,
  • Mostly cloudy with a slight (20%) chance of AM rain and snow, a bit warmer with a slight (20%) chance of rain Thursday and at night,
  • Partly cloudy and a bit warmer with a slight (20%) chance of rain Friday and Friday night,
  • Then mostly cloudy with a (40%) chance of rain Saturday.
  • highs 47-56 lows 30-37. (seasonal average high 57 low 39)

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

  • Mostly cloudy with early evening coastal showers likely and a (40%) chance of thunderstorms and coastal showers and a chance of thunderstorms tonight while inland showers and snow showers likely (70%) with a (40%) chance of thunderstorms tonight (0.25 in. of rain possible, 1-2 in. of snow possible, snow level 1,000 ft.)
  • Mostly cloudy with a good (50%) chance of coastal showers and a (40%) chance of thunderstorms Sunday while inland showers and snow showers with a  (30%) chance of thunderstorms Sunday (1 in. of snow possible, snow level 1,000 ft. rising to 1,500 ft. in the afternoon) night (snow level 1,500 ft.)
  • Mostly cloudy with coastal showers and a slight (20%) chance of thunderstorms while inland AM showers and snow and a slight (20%) chance of thunderstorms Monday with inland showers and a slight (20%) chance of thunderstorms a bit warmer Monday afternoon (AM snow level 1,500 ft.), evening rain, a good (50%) chance of coastal rain late at night while inland rain and snow likely (70%) at night,
  • Mostly cloudy with a (40%) chance of AM rain and snow, a (30%) chance of rain and a bit warmer Tuesday afternoon, partly cloudy with a slight (20%) chance of  rain and snow Tuesday night.
  • lows 34-35 cooling to 32 Tuesday night highs 48-49.
  • Partly cloudy and a bit warmer with a slight (20%) chance of rain and snow Wednesday, a slight (20%) chance of  rain and snow Wednesday night,
  • Mostly cloudy with a slight (20%) chance of AM rain and snow, partly cloudy with a slight (20%) chance of rain and a bit warmer Thursday afternoon, partly cloudy with a slight (20%) chance of rain at night,
  • Partly cloudy and a bit warmer with a slight (20%) chance of rain Friday, a (30%) chance of rain Friday night,
  • Mostly cloudy with a good (50%) chance of AM rain, then rain likely (70%) Saturday afternoon.
  • highs 50-57 lows 35-40. (seasonal average high 55 low 41)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with evening snow showers likely (70%) and a slight (20%) chance of thunderstorms, snow and rain showers late tonight (0.25 in. of rain possible, 1-2 in. of snow possible),
  • Mostly cloudy with AM snow and rain showers, a bit warmer with snow showers and a slight (20%) chance  of thunderstorms Sunday afternoon (0.50 in. of rain possible, 2-4 in. of snow possible), snow showers with a slight (20%) chance of thunderstorms Sunday night (0.50 in. of rain possible, 2-5 in. of snow possible),
  • Mostly cloudy and a bit warmer with snow showers Monday (snow possibly heavy at times), snow showers Monday night (snow possibly heavy at times),
  • Mostly cloudy and a bit warmer with snow showers likely (70%) Tuesday, partly cloudy with a good (50%) chance of snow showers Tuesday night.
  • snow level at the surface tonight, 1,500 ft. Sunday afternoon, at the surface Sunday night, 2,500 ft. Monday afternoon, 1,500 ft. Monday night, then at the surface Tuesday and Tuesday night.
  • lows 16-20 cooling to 13 Tuesday night highs 27-30.
  • Partly cloudy and a bit warmer with a (40%) chance of snow showers Wednesday, a slight (20%) chance of snow showers Wednesday night,
  • A mix of clouds and sun and a bit warmer with a (40%) chance of snow showers and a bit cooler Thursday, partly cloudy with a slight (20%) chance of snow showers at night,
  • Partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Friday, a slight (20%) chance of rain and snow showers Friday night,
  • Then mostly cloudy with a good (50%) chance of rain and snow showers Saturday.
  • snow level  at the surface Wednesday and Wednesday night, 1,500 ft, Thursday, 2,500 ft. Thursday night, 3,500  ft. Friday, then 4,500 ft. Friday night and Saturday.
  • highs 33-42 cooling to 40 Saturday lows 17-25.