TIM CHUEY WEATHER

April 3, 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 FROM 11 PM TONIGHT UNTIL 4 PM THURSDAY FOR CENTRAL OREGON.
• A WINTER STORM WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH SATURDAY MORNING FOR THE NORTHERN BLUE MOUNTAINS OF OREGON.

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 High Pressure Ridge (“Arch” shape) weakens allowing a cold front to make big changes. The graphics for days 1-3  show a frontal system moving through the Pacific Northwest today. The graphics for days 3-7    Saturday through Wednesday show a parade of frontal system moving into and through the Pacific Northwest through the period.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Mostly cloudy with a good (50%) chance of showers tonight (0.10 in. of rain possible),
• Mostly cloudy with showers likely (70%) with a slight (20%) chance of thunderstorms Thursday afternoon (under 0.10 in. of rain possible, more in storms), mostly cloudy with a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, partly cloudy with a slight (20%) chance of showers with areas of frost late Thursday night (under 0.10 in. of rain possible, more in storms),
• AM clouds and sun, mostly cloudy with a good (50%) chance of showers Friday afternoon (under 0.10 in. of rain possible), a good (50%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with showers Saturday, then a good (50%) chance of rain Saturday night.
• lows 37-34 warming to warming to 42 Saturday night highs near 52.
• Mostly cloudy with a good (50%) chance of AM showers, partly cloudy and a bit warmer with a good (50%) chance of showers Sunday afternoon, partly cloudy with patchy frost late Sunday night,
• Mostly sunny and a bit warmer Monday, mostly cloudy in the evening, partly cloudy at night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy in the evening, mostly cloudy late Tuesday night,
• Then a mix of clouds and sun and a bit warmer Wednesday.
• highs 56-67 lows 36-42. (seasonal averages high 59 low 39)

Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with a (30%) chance of rain and snow showers tonight (under 0.10 in. of rain possible, snow level 2,000 ft. falling to 1,500 ft.),
• Mostly cloudy with AM rain showers, snow showers likely (70%) and a slight (20%) chance of thunderstorms and a bit warmer Thursday afternoon (under 0.10 in. of rain possible, 1 in. of snow possible, snow level 2,000 ft.), a (40%) chance of evening rain showers and snow showers with a slight (20%) chance of thunderstorms, a slight (20%) chance of rain and snow showers Thursday night (under 0.10 in. of rain possible, snow level 2,000 ft.),
• Mostly cloudy with a good (50%) chance of AM rain and snow, a bit warmer with rain likely (70%) Friday afternoon (under 0.10 in. of rain possible, snow level 2,000 ft. rising to 2,500 ft.), a good (50%) chance of rain and snow at night,
• Then mostly cloudy and a bit warmer with rain and snow likely (70%) Saturday and  Saturday night.
• lows 38-42 highs near 52.
• Mostly cloudy with a good (50%) chance of AM rain and snow, a good (50%) chance of rain and a bit warmer Sunday afternoon, just partly cloudy  Sunday night,
• Partly cloudy and a bit warmer Monday, partly cloudy at night,
• Some AM clouds, sunny and a bit warmer Tuesday afternoon, just partly cloudy Tuesday night,
• Mostly cloudy start, then partly cloudy and a bit warmer Wednesday afternoon.
• highs 57-72 lows 38-45. (seasonal averages high 61 low 41)

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

• Mostly cloudy with a (40%) chance of coastal showers tonight while a (40%) chance inland early evening showers with a good (50%) chance of inland rain and snow showers tonight (under 0.10 in. of rain possible),
• Partly cloudy with a slight (20%) chance of AM coastal thunderstorms and a good (50%) chance of coastal showers and a slight (20%) chance of thunderstorms and a bit warmer Thursday afternoon while a good (50%) chance of inland showers and a slight (20%) chance of thunderstorms and a bit warmer Thursday afternoon (under 0.10 in. of rain possible), a good (50%) chance of coastal showers with a slight (20%) chance of thunderstorms Thursday night while a good (50%) chance of evening inland showers and thunderstorms and inland showers, snow showers and a slight (20%) chance thunderstorms Thursday night(under 0.10 in. of rain possible),
• Mostly cloudy with AM coastal showers likely (70%) with a slight (20%) chance of thunderstorms and a good (50%) chance of coastal rain and a bit warmer Friday afternoon while a good (50%) chance of inland rain Friday (0.10 in. of rain possible), a (40%) chance of rain at night,
• Mostly cloudy with a good (50%) chance of AM rain, rain likely (70%) and a bit cooler Saturday afternoon, evening rain, then rain likely (70%) late Saturday night.
• lows 35-42 highs 52-54 cooling back to 52 Saturday.
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Sunday, partly cloudy Sunday night,
• Partly cloudy and a bit warmer Monday, partly cloudy at night,
• Some AM clouds, sunny and a bit warmer Tuesday afternoon, mostly cloudy Tuesday night,
• Then mostly cloudy and a bit warmer Wednesday.
• highs 55-62 lows 39-44. (seasonal average high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly cloudy with evening showers and snow showers, snow showers late tonight (0.25 in. of rain possible, 1-3 in. of snow possible),
• Mostly cloudy with snow showers and a bit cooler with a slight (20%) chance of thunderstorms Thursday afternoon (0.25 in. of rain possible, 1-3 in. of snow possible), evening snow showers likely (70%) with a slight (20%) chance of thunderstorms, a good (50%) chance of snow showers late Thursday night,
• Mostly cloudy with a good (50%) chance of AM snow showers, a bit warmer with snow and rain showers likely (70%) Friday afternoon, snow showers and rain showers at night,
• Mostly cloudy and a bit warmer with snow and rain showers Saturday, then snow showers likely (70%) with rain showers Saturday night.
• snow level 3,000 ft. falling to 2,000 ft. tonight, at the surface Thursday, 2,000 ft. Thursday night, 3,000 ft. Friday afternoon, 2,500 ft. Friday night, then 3,000 ft. Saturday and Saturday night.
• lows 23-27 highs 33-36.
• Mostly cloudy and a bit warmer with snow and rain showers likely (70%) Sunday, a (30%) chance of rain and snow showers late Sunday night,
• Mostly sunny and a bit warmer Monday, partly cloudy at night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
• Then mostly sunny and a bit warmer Wednesday.
• snow level 3,000 ft. Sunday, 3,500 ft. Sunday night, free air freezing level 4,500 ft. Monday, 6,000 ft. Monday night, 8,000 ft. Tuesday, 9,000 ft. Tuesday night, then 10,000 ft. Wednesday.
• highs 38-58 lows 24-33.