TIM CHUEY WEATHER

March 28, 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 11 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.

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:

An Upper Level Low Pressure Trough (“U” shape) just offshore is sending a lot of moisture to about all of the Western U.S.. The graphics for days 1-3  show no frontal systems moving through or into Pacific Northwest. The graphics for days 3-7    Sunday through Thursday show the complex frontal system headed toward the Pacific Northwest Coast moving through  through Southern California between Tuesday through next Thursday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Mostly cloudy with evening showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers late tonight (0.25 in. of rain possible, more in storms),
• Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun and a bit warmer Friday afternoon,  partly cloudy in the evening, clear with areas of frost late Friday night,
• Areas of AM frost, sunny and a bit warmer Saturday afternoon, mostly clear at night,
• Sunny and a bit cooler Sunday (Easter), then mostly clear Sunday night.
• lows near 39 highs 59-62 cooling to 60 Sunday.
• Sunny and a bit warmer Monday, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a good 50%) chance of showers Wednesday, mostly cloudy with a good (50%) chance  of showers Wednesday night,
• Then a mix of clouds and sun a bit cooler with a (50%) chance of showers Thursday.
• highs 67-69 cooling to 54 Thursday lows 44-38. (seasonal averages high 58 low 38)

Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with evening showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers late tonight (0.25 in. of rain possible, more in storms),
• Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun and a bit warmer Friday afternoon,  partly cloudy in the evening, clear with areas of frost late Friday night,
• Areas of AM frost, sunny and a bit warmer Saturday afternoon, mostly clear at night,
• Sunny and a bit cooler Sunday (Easter), then mostly clear Sunday night.
• lows near 39 highs 59-62 cooling to 60 Sunday.
• Sunny and a bit warmer Monday, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a good 50%) chance of showers Wednesday, mostly cloudy with a good (50%) chance  of showers Wednesday night,
• Then a mix of clouds and sun a bit cooler with a (50%) chance of showers Thursday.
• highs 67-69 cooling to 54 Thursday lows 44-38. (seasonal averages high 58 low 38)

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

• Mostly cloudy with early evening coastal showers with a (40%) chance of thunderstorms, showers likely (70%) with a slight (20%) chance of thunderstorms tonight while inland evening showers and a slight (20%) chance of thunderstorms and inland showers  with a slight (20%) chance of thunderstorms late tonight (0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of AM rain and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers and a bit warmer Friday (under 0.10 in. of rain possible), mostly cloudy in the evening, just partly cloudy late Friday night,
• Sunny and a bit warmer Saturday, mostly clear in the evening, partly cloudy late at night,
• Some AM clouds, sunny and a bit cooler Sunday (Easter), then clear Sunday night,
• lows near 42 highs 59-62 cooling to 60 Sunday.
• Sunny and a bit warmer Monday, mostly clear Monday night,
• Mostly sunny Tuesday, partly cloudy in the evening, mostly cloudy late at night,
• Mostly cloudy with a slight (20%) chance of rain and a bit cooler Wednesday, a slight  (20%) chance of rain Wednesday night,
• Mostly cloudy with a (40%) chance of rain Thursday.
• highs 62-54 lows 43-46 cooling to 39 Wednesday night. (seasonal average high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly cloudy with evening snow showers and rain showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of snow showers late tonight (0.25 in. of rain possible, 1 in. of snow possible), brisk wind (Pass Wind: SW 20-25 mph evening shifting and decreasing to S 10-15 mph mph late at night),
• Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun with a good (50%) chance of rain and snow showers and a bit warmer Friday afternoon, a (40%) chance of evening snow showers and a slight (20%) of rain showers, just partly cloudy late Friday night,
• Sunny and a bit warmer Saturday, mostly clear Saturday night,
• Mostly sunny with a slight (20%) chance of rain and snow showers Sunday (Easter), mostly clear Sunday night.
• snow level 2,500 ft. tonight, 2,500 ft. rising to 4,000 ft. Friday afternoon, 4,000 ft. Friday night, 5,000 ft. rising to 6,000 ft.  Saturday afternoon, then free air freezing level 6,000 ft. Saturday night, snow level 4,000 ft. Sunday, then free air freezing level 6,500 ft. Sunday night.
• lows 24-28 highs 42-46.
• Sunny and a bit warmer Monday, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late at night.
• AM mix of clouds and sun, mostly cloudy with a good (50%) chance of rain and snow showers and a bit cooler Wednesday afternoon, mostly cloudy with a good (50%) chance of snow showers and a slight (20%) chance of rain showers Wednesday night,
• AM clouds and sun with with a good (50%) chance of snow showers and a slight (20%) chance of rain showers, then a bit cooler with a mix of clouds and sun with with a good (50%) chance of snow showers and a slight (20%) chance of rain showers Thursday afternoon.
• free air freezing level 10,000 ft. Monday, 11,000 ft. Monday night and Tuesday, snow level 7,500 ft. Tuesday night, 5,500 ft. Wednesday, 3,500 ft. Wednesday night, then 2,500 ft. Thursday.
• highs 53-62 cooling to 39 Thursday lows 35-26.