TIM CHUEY WEATHER

April 18, 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 FLOOD WARNING IS IN EFFECT UNTIL EARLY FRIDAY AFTERNOON FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING MALHEUR COUNTY.

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  brings the Pacific Northwest a lot more sunshine.  The graphics for days 1-3  show a complex frontal system moving through Oregon Saturday. The graphics for days 3-7  Sunday through Thursday show a frontal system that moves across the Pacific Northwest Wednesday.  Another complex frontal system will be offshore next Thursday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Mostly clear this evening, partly cloudy late tonight,
• Sunny and a bit warmer Friday, partly cloudy Friday night,
• AM sun, a mix of clouds and sun with a good (50%) chance of showers and a bit cooler with a good (50%) chance of showers Saturday afternoon, mostly cloudy with a good (50%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a (40%) chance of showers Sunday, then becoming mostly clear Sunday night.
• lows 38-44 cooling to back to 38 Sunday night highs 72-60.
• Mostly sunny and a bit warmer Monday, partly cloudy Monday night,
• A mix of clouds and sun and a bit warmer Tuesday, mostly cloudy with a slight (20%) chance of showers at night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler with a (40%) chance of showers Wednesday afternoon,
• Then mostly cloudy and a bit cooler with a good (50%) chance of showers Thursday.
• highs 66-68 cooling to 60 Thursday lows 42-45. (seasonal averages high 62 low 40)

Forecast for the Umpqua Valley including Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Sunny and a bit warmer Friday, partly cloudy Friday night,
• Sunny start, becoming mostly cloudy and a bit cooler with a (30%) chance of rain Saturday afternoon, mostly cloudy with a slight (20%) chance of evening rain, partly cloudy with a slight (20%) chance of rain at night,
• Partly cloudy with a slight (20%) chance of AM rain, partly cloudy and a bit cooler Sunday afternoon and evening, then mostly cloudy with areas of frost late Sunday night.
• lows 44-47 cooling to 37 Sunday night highs 76-62.
• Areas of AM frost, partly cloudy and a bit warmer Monday afternoon, partly cloudy Monday night,
• Mostly cloudy start, partly cloudy with a slight (20%) chance of AM rain, partly cloudy and a bit warmer Tuesday afternoon, mostly cloudy with a slight (20%) chance of rain at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Wednesday, a (30%) chance of rain Wednesday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of rain Thursday.
• highs 68-72 cooling to 62 Thursday lows 43-46. (seasonal averages high 64 low 43)

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

• Mostly clear this evening, partly cloudy late tonight,
• Sunny Friday, partly cloudy and a bit warmer Friday night,
• Partly cloudy with a goods (50%) chance of AM coastal rain and mostly cloudy and a bit cooler with coastal rain likely (70%) Saturday afternoon while a sunny start inland becoming mostly cloudy with a (40%) chance of inland Saturday afternoon, rain at night, mostly cloudy with a slight (20%) chance of evening rain and partly cloudy with a slight (20%) chance of rain late at night,
• Partly cloudy with a slight (20%) chance of AM rain, just partly cloudy Sunday afternoon, then partly cloudy with areas of frost Sunday night.
• lows 42-44 cooling to 36 Sunday night highs 65-58.
• Partly cloudy and a bit warmer Monday, mostly cloudy Monday night,
• Mostly cloudy and a bit cooler Tuesday, mostly cloudy with a slight (20%) chance of rain late at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Wednesday, a slight (20%) chance of rain Wednesday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of rain Thursday.
• highs 60-57 lows near 45. (seasonal average high 57 low 44)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly clear this evening, partly cloudy late tonight,
• Sunny and a bit warmer Friday, mostly clear in the evening, partly cloudy late Friday night,
• Morning sun,  partly cloudy and a bit cooler with a good (50%) chance of showers Saturday afternoon, mostly cloudy with evening rain and snow showers, a slight (20%) chance of rain and snow showers late at night,
• A mix of clouds and sun and cooler with good (50%) chance of snow showers and a slight (20%) chance of rain showers Sunday, then mostly clear with widespread frost late Sunday night.
• free air freezing level 9,000 ft. tonight and Friday, 10,000 ft. Friday night, snow level 6,500 ft. Saturday, 5,000 ft. falling to 3,500 ft. late Saturday night, snow level 3,500 ft. Sunday, then free air freezing level 6,500 ft. Sunday night.
• lows 32-36 cooling to 28 Saturday night and Sunday night highs 59-47.
• Sunny and warmer Monday, partly cloudy Monday night,
• Mostly sunny and a bit warmer Tuesday, mostly cloudy with a slight (20%) chance of rain and snow showers at night.
• A mix of clouds and sun and cooler with a good (40%) chance of rain and snow showers Wednesday, mostly cloudy with a good (50%) chance of  rain and snow showers Wednesday night,
• Then mostly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Thursday.
• free air freezing level 10,000 ft. Monday and Monday night, snow level 6,500 ft. Tuesday, 6,500 ft. Tuesday night, 6,000 ft. Wednesday, then 5,500 ft. Wednesday night and Thursday.
• highs 59-60 cooling to 44 Thursday lows 36-33.