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

• A FROST ADVISORY IS IN EFFECT UNTIL 8 AM MONDAY FOR THE NORTH OREGON COAST RANGE LOWLANDS, THE NORTH OREGON COAST RANGE, THE UPPER HOOD RIVER VALLEY, AND THE CLACKAMAS COUNTY CASCADE FOOTHILLS.

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) brought the Pacific Northwest a small chance of rain. Now it’s time for dry weather and sunshine.  The graphics for days 1-3  show the cold front that moved through Oregon Saturday for cooling and a few showers. The next front is on the way. 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:

• Mostly clear this evening, partly cloudy late tonight,
• Areas of AM frost, mostly sunny and a bit warmer Monday (Earth Day), mostly cloudy Monday night,
• A mix of clouds and sun and a bit warmer Tuesday, mostly clear in the evening, partly cloudy with patchy fog late at night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday afternoon,  then mostly cloudy with a slight (20%) chance of  showers Wednesday night.
• lows 37-44 highs 67-72 cooling to 64 Wednesday.
• Mostly cloudy and a bit cooler with a showers likely (70%) Thursday, showers Thursday night.
• Mostly cloudy with showers likely (70%) and a bit warmer Friday, a good (50%) chance of showers at night,
• Mostly cloudy with a good (50%) chance of AM showers, partly cloudy and a bit warmer with a good (50%) chance of showers Saturday afternoon, mostly cloudy with a good (50%) chance of showers Saturday night,
• Mostly cloudy with a good (50%) chance of AM showers, then a mix of clouds and sun with a good (50%) of showers Sunday afternoon.
• highs 57-62 lows 47-43. (seasonal averages high 63 low 41)

Forecast for the Umpqua Valley including Roseburg:

• Partly cloudy tonight,
• Mostly cloudy and a bit warmer Monday (Earth Day), mostly cloudy Monday night,
• Partly cloudy and a bit warmer Tuesday, partly cloudy at night,
• Mostly cloudy start, partly cloudy and a bit cooler Wednesday afternoon and evening, then mostly cloudy with a slight (20%) chance of rain late Wednesday night.
• lows 39-46 cooling to 43 Tuesday warming to 45 Wednesday night highs 72-74 cooling to 67 Wednesday.
• Mostly cloudy with a good (50%) chance of AM rain, a bit cooler with rain likely (70%) Thursday afternoon, rain Thursday night,
• Mostly cloudy with rain and a bit warmer Friday, a good (50%) chance of rain at night,
• Mostly cloudy and a bit warmer with a (30%) chance of rain Saturday, a (30%) chance of rain Saturday night,
• Then mostly cloudy and a bit warmer with a (40%) chance of rain Sunday.
• highs 58-64 lows 48-45. (seasonal averages high 65 low 43)

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

• Partly cloudy tonight,
• Mostly cloudy and a bit warmer Monday (Earth Day), partly cloudy Monday night,
• Mostly cloudy start, partly cloudy and cooler Tuesday afternoon and evening, mostly cloudy late at night,
• Mostly cloudy Wednesday, then mostly cloudy with a slight (20%) chance of rain late Wednesday night.
• lows 39-44 cooling to 42 Tuesday night warming to 44 Wednesday night highs 65-59.
• Mostly cloudy with AM rain likely (70%), rain and a bit cooler Thursday afternoon, rain Thursday night,
• Mostly cloudy with AM rain likely (70%), a good (50%) chance of rain and a bit warmer Friday afternoon, a (40%) chance of rain at night,
• Mostly cloudy with a (40%) chance of rain Saturday and Saturday night,
• Then mostly cloudy with a good (50%) chance  of rain Sunday.
• highs 54-57 lows 47-44. (seasonal average high 57 low 45)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Partly cloudy tonight,
• Mostly sunny and warmer Monday (Earth Day), becoming mostly cloudy Monday night,
• A mix of clouds and sun with a slight (20%) chance of showers Tuesday afternoon, partly cloudy with a slight (20%) chance of showers Tuesday night,
• A mix of clouds and sun and cooler with a slight (20%) chance of rain and snow showers Wednesday, then mostly cloudy with a good (50%) chance of  rain and snow showers Wednesday night.
• free air freezing level 8,000 ft. rising to 9,000 ft. late tonight, 10,000 ft. Monday and Monday night, snow level 7,000 ft. falling to 5,000 ft. late Tuesday afternoon, 7,000  ft. falling to 5,500 ft. late Tuesday night, 5,000 ft. Wednesday, then 5,500 ft. Wednesday night.
• lows 32-38 cooling to 33 Wednesday night highs 62-52.
• Mostly cloudy with rain and snow showers and a bit cooler Thursday, rain and snow showers Thursday night,
• Mostly cloudy with rain and snow showers Friday, rain showers likely (70%) with a (%) chance of snow showers at night,
• Mostly cloudy with rain and snow showers likely (70%) Saturday, a (50%) chance of rain and snow showers Saturday night,
• Then mostly cloudy and a bit warmer with rain and snow showers likely (70%) Sunday.
• snow level 5,000 ft. Thursday, 5,500 ft. Thursday night, then 5,000 ft. Friday through Sunday.