TIM CHUEY WEATHER

April 21, 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) brings the Pacific Northwest a small chance of rain.  The graphics for days 1-3  show the cold front that moved through Oregon Saturday for cooling and possible showers. The graphics for days 3-7  Wednesday through Sunday show a frontal system that moves across the Pacific Northwest between by Wednesday.  Another frontal system will weaken and push in Friday, then a complex frontal system will be offshore headed our way next Saturday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Patchy AM fog, sunny and a bit cooler today, partly cloudy this evening, becoming mostly clear with patchy frost late tonight,
• Mostly sunny and a bit warmer Monday (Earth Day), mostly cloudy in the evening, partly cloudy late at night,
• A mix of clouds and sun and a bit warmer Tuesday, then partly cloudy Tuesday night.
• highs 62-70 lows 37-42.
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Wednesday, partly cloudy with a slight (20%) chance of  showers Wednesday night,
• AM clouds and sun with a good (50%) chance of showers, mostly cloudy and a bit cooler with a good (50%) chance of showers Thursday afternoon, showers likely (70%) at night,
• Mostly cloudy with showers likely (70%) and a bit warmer Friday, a good (50%) chance of showers Friday night,
• AM clouds and sun with a (40%) chance of showers, then mostly cloudy and a bit warmer with a (40%) chance of showers Saturday afternoon.
• highs 65-59 warming to 62 Saturday lows 42-46 cooling to 43 Friday night. (seasonal averages high 62 low 41)

Forecast for the Umpqua Valley including Roseburg:

• Partly cloudy and a bit cooler today, mostly clear this evening, partly cloudy tonight,
• Sunny and a bit warmer Monday afternoon (Earth Day), partly cloudy at night,
• Partly cloudy Tuesday, then partly cloudy Tuesday night.
• highs 65-73 lows 40-46 cooling to 44 Tuesday.
• Partly cloudy and a bit cooler Wednesday, partly cloudy Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM rain, a bit cooler with a (30%) chance of showers Thursday afternoon, mostly cloudy with a good (50%) chance of showers at night,
• Mostly cloudy with  AM showers likely (70%), a good (50%) chance of showers and a bit cooler Friday afternoon, a (30%) chance of showers Friday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of showers Saturday.
• highs 69-60 warming to 63 Saturday lows 44-48 cooling to 46 Friday night. (seasonal averages high 65 low 43)

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

• Partly cloudy and a bit cooler today, mostly clear this evening, partly cloudy late tonight,
• Sunny start, partly cloudy and a bit warmer Monday afternoon (Earth Day), partly cloudy at night,
• Mostly cloudy and cooler Tuesday, then partly cloudy Tuesday night.
• highs 59-64 cooling back to 59 Tuesday lows 40-44.
• Mostly cloudy a bit cooler Wednesday, mostly cloudy Wednesday night,
• Mostly cloudy with a slight (20%) of AM rain, a bit warmer with a (40%) chance of showers Thursday afternoon, showers likely (70%) at night,
• Mostly cloudy with showers likely (70%) Friday, a slight (20%) chance of showers Friday night,
• Then mostly cloudy with a slight (20%) chance of showers Saturday.
• highs 60-56 warming to 57 Friday and Saturday lows 43-46. (seasonal average high 57 low 45)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly sunny and cooler today, mostly clear tonight,
• Mostly sunny and warmer Monday (Earth Day), mostly cloudy at night,
• Mostly sunny and a bit cooler Tuesday, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• free air freezing level 4,000 ft. rising to 6,500 ft. this afternoon, 9,000 ft. late tonight, 9,000 ft. rising to 10,000 ft. Monday afternoon, 11,o00 ft. Monday night, 10,000 ft. Tuesday, then snow level 6,500 ft. late Tuesday night.
• highs 52-62 lows 32-38 cooling to 35 Tuesday night.
• A mix of clouds and sun and cooler with a slight (20%) chance of rain and snow showers Wednesday, mostly cloudy with a good (50%) chance of  rain and snow showers Wednesday night,
• AM clouds and sun with snow showers likely (70%) and a good (50%) chance of rain, mostly cloudy and a bit cooler with snow showers likely (70%) with a good (50%) chance of rain Thursday afternoon, rain and snow showers likely (70%) at night,
• Mostly cloudy with rain and snow showers likely (70%) and a bit cooler Friday.
• snow level 5,500 ft. Wednesday and Wednesday night, 5,000 ft. Thursday, 5,500 ft. Thursday night, then 5,000 ft. Friday through Saturday.
• highs 52-42 warming to 46 Saturday lows near 33.