TIM CHUEY WEATHER

April 5, 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 STORM WARNING IS IN EFFECT UNTIL 11 AM SATURDAY FOR THE NORTHERN BLUE MOUNTAINS OF OREGON.
• A FLOOD WARNING IS IN EFFECT UNTIL EARLY WEDNESDAY AFTERNOON FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING MALHEUR COUNTY.
• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR THE NORTH OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE, THE TUALATIN VALLEY, THE WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL WILLAMETTE VALLEY, THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS,  THE LANE COUNTY LOWLANDS, THE UPPER HOOD RIVER VALLEY, CLACKAMAS COUNTY, THE CASCADE FOOTHILLS, THE CASCADE FOOTHILLS OF MARION AND LINN COUNTIES, AND THE LANE 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:

• A strong Upper Level Low Pressure Trough (“U” shape) is moving up to the Pacific Coast. The graphics for days 1-3  show a frontal system approaching the Pacific Northwest Saturday. The graphics for days 3-7    Monday through Friday show frontal systems moving over the Pacific Northwest Wednesday and Friday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• AM clouds and sun with a slight (20%) chance of showers, mostly cloudy and a bit warmer with a good (50%) chance of showers this afternoon (under 0.10 in. of rain possible), a good (50%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with showers and a bit cooler Saturday (0.10 in., of rain possible) and in the evening, a good (50%) chance of showers at night (0.10 in., of rain possible),
• Mostly cloudy with showers likely (70%) and a bit warmer Sunday, then mostly cloudy with patchy frost late Sunday night.
• highs 54-52 warming back to 54 Sunday lows 38-40 cooling to 37 Sunday night.
• A mix of clouds and sun and a bit warmer Monday, mostly cloudy in the evening, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, partly cloudy at night,
• A mix of clouds and sun and a bit warmer Wednesday, mostly cloudy Wednesday night,
• Then mostly sunny and a bit warmer Thursday.
• highs 60-70 lows 39-43. (seasonal averages high 59 low 39)

Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with a good (50%) chance of AM rain and snow showers, a (30%) of showers and a bit warmer this afternoon (under 0.10 in. of rain possible, snow level 2,000 ft. rising to 2,500 ft.), a (30%) chance of rain and snow showers tonight (under 0.10 in. of rain possible, snow level 2,500 ft. falling to 2,000 ft.),
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers likely (70%) and a bit warmer Saturday afternoon (under 0.10 in., of rain possible), evening showers, a good(50%) chance of rain and snow showers at night (0.10 in., of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain and snow, rain likely (70%) and a bit warmer Sunday afternoon, a slight (20%) chance of evening rain, then just mostly cloudy  Sunday night.
• highs 52-54 lows 37-39.
• AM clouds, partly cloudy and a bit warmer Monday afternoon, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, just partly cloudy at night,
• Then partly cloudy and a bit warmer Wednesday and Thursday, partly cloudy Wednesday night.
• highs 62-73 lows 39-46. (seasonal averages high 61 low 41)

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

• Mostly cloudy with a (30%) chance of AM coastal showers and a slight (20%) chance of thunderstorms with a good (50%) chance of coastal showers and a bit warmer this afternoon while patchy AM inland fog and a slight (20%) chance of showers today (under 0.10 in. of rain possible), a (30%) chance of showers tonight,
• Mostly cloudy with AM coastal showers likely (70%) while a good (50%) chance of AM inland showers with inland showers and a bit warmer Saturday afternoon (0.10 in., of rain possible), evening showers, coastal showers with a slight (20%) chance of thunderstorms late at night while inland showers likely (70%) late at night (0.25 in., of rain possible),
• Mostly cloudy with AM rain likely (70%), a bit warmer with a good (50%) chance of rain Sunday, a slight (20%) chance of evening rain, then just mostly cloudy late Sunday night.
• highs 52-54 lows 40-38.
• Partly cloudy and a bit warmer Monday and Tuesday, partly cloudy both nights,
• Mostly cloudy and a bit warmer Wednesday and Wednesday night,
• Mostly cloudy start, then partly cloudy and a bit warmer Thursday afternoon.
• highs 58-63 lows 42-45. (seasonal average high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly cloudy with a good (50%) chance of AM snow showers, a bit warmer with snow and rain showers this afternoon (0.25 in. of rain possible, 1 in. of snow possible), snow showers likely (70%) tonight 0.25 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy and a bit warmer with snow  showers and rain showers Saturday afternoon, snow and rain showers at night,
• Mostly cloudy and a bit warmer with snow and rain showers Sunday, then a good (50%) chance of rain and snow showers late Sunday night.
• snow level 2,000 ft. today, 2,500 ft. tonight, 2,000 ft. rising to 3,500 ft. Saturday afternoon, then 3,000 ft. Saturday night through Sunday night.
• highs 33-37 lows 24-26 cooling back to 24 Friday night.
• Mostly sunny and a bit warmer Monday, partly cloudy in the evening, moistly clear late Monday night,
• Sunny and a bit warmer Tuesday, partly cloudy at night,
• Mostly sunny and a bit warmer Wednesday, partly cloudy Wednesday night,
• Then mostly sunny and a bit warmer Thursday.
• snow level  free air freezing level 4,500 ft. Monday, 7,000 ft. Monday night, 9,000 ft. Tuesday and Tuesday night, 10,000 ft. Wednesday, 11,000 ft. Wednesday night, then 10,000 ft. Thursday.
• highs 45-62 lows 29-37.