TIM CHUEY WEATHER

March 24, 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

• NONE AT THIS TIME.

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) covers just about all of the Western U.S..  The graphics for days 1-3  show the frontal system moving through the Pacific Northwest Monday. The graphics for days 3-7    Wednesday through Sunday show the parade of frontal systems headed toward the Pacific Northwest between Wednesday and Thursday and another moves southeastward through Southern California between Friday and next Saturday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Mostly cloudy with a slight (20%) chance of evening rain, a good (50%) chance of rain late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with rain and slightly cooler Monday (under 0.10 in. of rain possible), evening rain likely (70%), a good (50%) chance of rain late Monday night (under 0.10 in. of rain possible),
• Mostly cloudy with AM rain likely (70%), a mix of clouds and sun and a bit warmer with a good (50%) chance of rain Tuesday afternoon, a good (50%) chance of evening rain, rain likely (70%) late at night (0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with rain Wednesday, then showers with a slight (20%) chance of thunderstorms Wednesday night.
• lows 42-45 cooling back to 42 Wednesday night highs 53-57 cooling to 55 Wednesday.
• Mostly cloudy and a bit cooler with rain and a slight (20%) chance of thunderstorms Thursday, showers likely (70%) with a slight (20%) chance of thunderstorms Thursday night,
• Mostly cloudy with rain likely (70%) and a bit warmer Friday, a (40%) chance of evening rain, partly cloudy with a (40%) chance of rain late at night,
• Mostly sunny and a bit warmer with a slight (20%) chance of rain Saturday, mostly clear Saturday night,
• Then sunny and a bit warmer Sunday.
• highs 54-64 lows near 39. (seasonal averages high 58 low 38)

Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of AM showers, rain likely (70%) and a bit cooler Monday afternoon (under 0.10 in. of rain possible, snow level 3,500 ft.), evening rain likely (70%), a good (50%) chance of showers late Monday night (under 0.10 in. of rain possible, snow level 3,500 ft.),
• Mostly cloudy and a bit warmer with a (40%) chance of showers Tuesday (under 0.10 in. of rain possible, snow level 3,000 ft.), a good (50%) chance of evening showers, showers likely (70%) late at night (under 0.10 in. of rain possible),
• Then mostly cloudy and a bit cooler with showers and a slight (20%) chance of thunderstorms Wednesday and Wednesday night.
• lows 42-47 cooling to 43 Wednesday night highs 54-60 cooling to 57 Wednesday.
• Mostly cloudy with AM showers and snow showers with a slight (20%) chance of thunderstorms, showers and a bit cooler with a slight (20%) chance of thunderstorms Thursday afternoon, evening showers, a good (50%) chance of rain and snow showers at night,
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, a good (50%) chance of showers and a bit warmer Friday afternoon, mostly cloudy with a good (50%) chance of evening showers, a (30%) chance of showers late Friday night,
• Mostly cloudy with a (30%) chance of AM showers, partly cloudy and a bit warmer with a slight  (20%) chance of showers Saturday afternoon, a slight (20%) chance of evening showers, becoming mostly clear late Saturday night,
• Then sunny and a bit warmer Sunday.
• highs 55-64 lows near 40. (seasonal average high 60 low 40)

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

• Mostly cloudy with a slight (20%) chance of early evening inland showers, a slight (20%) chance of showers tonight,
• Mostly cloudy with a good (50%) chance of AM showers, coastal showers likely (70%) Monday afternoon while inland rain likely (70%) Monday afternoon (under 0.10 in. of rain possible), a good (50%) chance of evening coastal rain while evening inland rain likely (70%), a good (50%) chance of showers late Monday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a (30%) chance of showers Tuesday (under 0.10 in. of rain possible), cloudy with a good (50%) chance of evening showers, showers likely (70%) late at night (under 0.10 in. of rain possible),
• Then mostly cloudy and a bit cooler with showers and breezy and a slight (20%) chance of thunderstorms Wednesday and Wednesday night.
• lows 43-46 cooling back to 43 Wednesday night highs 54-57 cooling to 55 Wednesday.
• Mostly cloudy with showers and a bit cooler and breezy with a slight (20%) chance of thunderstorms Thursday, evening showers, showers likely (70%) Thursday night,
• Mostly cloudy with AM showers likely (70%), a bit warmer with a good (50%) chance of showers Friday afternoon, mostly cloudy with a (40%) chance of  evening showers, partly cloudy with a (30%) chance of showers at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Saturday and in the evening, just partly cloudy late Saturday night,
• Then mostly sunny and a bit warmer with a slight (20%) chance of showers Sunday afternoon.
• highs 53-59 lows near 42. (seasonal average high 55 low 42)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly cloudy with evening rain and snow likely (70%), a good (50%) chance of rain and snow late tonight (0.25 in,. of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain and snow, rain and snow and a bit warmer Monday afternoon (0.10 in. of rain possible, 1 in. of snow possible), rain and snow Monday night (0.10 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy with AM snow and rain likely (70%), a mix of clouds and sun with a good (50%) chance of rain and snow and a bit Tuesday afternoon, rain and snow likely (70%) late at night,
• Mostly cloudy with rain and snow Wednesday, then snow and rain with a slight (20%) chance of thunderstorms Wednesday night.
• snow level 3,500 ft. tonight through Tuesday, 4,500 ft. Tuesday night and Wednesday, then 3,000 ft. Wednesday night.
• lows  28-32 cooling to 27 Wednesday night highs 38-40.
• Mostly cloudy and a bit cooler with rain and snow Thursday, a good (50%) chance of snow and rain Thursday night,
• Mostly cloudy with snow and rain and a bit warmer Friday, a (30%) chance of rain and snow at night,
• A mix of clouds and sun with a good (50%) chance of rain and snow and a bit warmer Saturday, slow clearing with a (30%) chance of rain and snow Saturday night,
• Then mostly sunny and a bit warmer with a slight (20%) chance of rain and snow Sunday.
• snow level 3,500 ft. Thursday through Friday, 4,000 ft. Friday through Saturday, then 4,500 ft. 4,500 ft. Saturday night and Sunday.
• highs 40-48 lows 25-27.