May 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
- 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 ) is approaching the West Coast bringing unsettled weather. The graphics for days 1-3 show frontal systems moving into or across Oregon. The graphics for days 3-7 Tuesday through Saturday show a front that slides through between Tuesday and Tuesday night. Another cold front will push into the Pacific Northwest Friday.
Forecast For The South Willamette Valley Including Eugene-Springfield:
- Partly cloudy tonight,
- Mostly sunny Sunday, partly cloudy in the evening, mostly clear late Sunday night,
- Sunny and a bit warmer Monday, mostly clear with patchy fog late at night,
- Mostly sunny with a slight (20%) of AM rain, mostly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon, then mostly cloudy with a good (50%) chance of rain Tuesday night, patchy fog late.
- lows 40-49 highs 63-69 cooling to 66 Tuesday.
- Mostly cloudy with patchy AM fog and and a good (50%) chance of rain, partly cloudy and a bit cooler with a good (50%) chance of rain Wednesday afternoon, partly cloudy with patchy fog and a slight (20%) chance of showers Wednesday night,
- Mostly sunny and a bit warmer with a slight (20%) chance of showers Thursday, partly cloudy with patchy fog and a (30%) chance of showers at night,
- A mix of clouds and sun and a bit warmer with a (40%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
- Then a mix of clouds and sun and a bit cooler with a (30%) chance of showers Saturday.
- highs 64-69 cooling to 66 Saturday lows 44-46. (seasonal averages high 69 low 44)
Forecast for the Umpqua Valley including Roseburg:
- Increasing clouds to mostly cloudy late tonight,
- Partly cloudy and a bit cooler with a slight (20%) chance of showers Sunday afternoon, partly cloudy in the evening, mostly clear late Sunday night,
- Sunny and a bit warmer Monday, mostly clear at night,
- Partly cloudy start, mostly cloudy and a bit warmer Tuesday afternoon, then mostly cloudy with a slight (2o%) chance of showers Tuesday night.
- lows 44-52 highs 65-72.
- Mostly cloudy with a (20%) chance of showers and a bit cooler Wednesday, partly cloudy with a slight (20%) chance of showers Wednesday night,
- Partly cloudy with a slight (20%) chance of showers and a bit warmer Thursday, a slight (20%) of showers at night,
- Partly cloudy and a bit warmer with a slight (20%) of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
- Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Saturday.
- highs 66-72 cooling to 68 Saturday lows 46-49. (seasonal average high 72 low 48)
Forecast for the Oregon Coast including Coos Bay and North Bend:
- Increasing clouds to mostly cloudy late tonight,
- Partly cloudy with a slight (20%) chance of AM coastal showers, becoming sunny and a bit cooler Sunday afternoon, mostly clear Sunday night,
- Sunny and a bit warmer Monday, mostly clear in the evening, partly cloudy at night,
- Partly cloudy start, mostly cloudy Tuesday afternoon, mostly cloudy with a slight (20%) chance of showers Tuesday night,
- lows 42-48 highs 59-62.
- Mostly cloudy with a slight (20%) chance of AM showers, just partly cloudy and a bit cooler Wednesday afternoon, partly cloudy in the evening, mostly cloudy late Wednesday night.
- Partly cloudy and a bit warmer Thursday, partly cloudy with a slight (20%) chance of showers late at night,
- Mostly cloudy with a slight (20%) chance of showers Friday and Friday night,
- Mostly cloudy with a slight (20%) chance of AM showers, then partly cloudy with a slight (20%) chance of showers Saturday afternoon.
- highs 59-62 lows 44-46. (seasonal average high 61 low 48)
Forecast for the Northern Oregon Cascades including Willamette Pass:
- Mostly cloudy tonight,
- Mostly sunny Sunday, partly cloudy Sunday night,
- Sunny and a bit warmer Monday, mostly clear at night,
- Mostly sunny and a bit warmer with a slight (20%) chance of rain Tuesday, then mostly cloudy with showers likely (70%) Tuesday night.
- free air freezing level 7,000 ft. falling to 5,000 ft. late tonight, 4,500 ft. rising to 5,500 ft. Sunday afternoon, 6,000 ft. falling to 5,500 ft. late Sunday night, 7,500 ft. rising to 7,000 ft. Monday afternoon, 8,000 ft. falling to 7,500 ft. late Monday night, snow level 6,500 ft. Tuesday, then 7,500 ft. Tuesday night.
- lows 29-38 highs 48-55.
- Mostly cloudy with a good (50%) chance of AM rain and snow showers, partly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Wednesday afternoon, mostly cloudy with a good (50%) chance of rain and snow showers Wednesday night,
- Mostly sunny and a bit warmer with a slight (20%) chance of rain and snow showers Thursday, mostly cloudy with a (40%) chance of showers at night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of showers Friday, mostly cloudy with a good (50%) rain and snow showers Friday night,
- Then a mix of clouds and sun and a bit cooler with a (40%) chance of rain and snow showers Saturday.
- snow level 6,000 ft. Wednesday, 5,500 ft. Wednesday night and Thursday, 6,500 ft. Thursday night through Friday night, then 6,000 ft. Saturday.
- highs 46-55 cooling to 53 Saturday lows 32-35.