TIM CHUEY WEATHER

April 16, 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 FREEZE WARNING IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM WEDNESDAY FOR THE NORTH OREGON COAST RANGE, THE CENTRAL OREGON COAST RANGE, THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, THE LANE COUNTY LOWLANDS (WHICH INCLUDE EUGENE & SPRINGFIELD), THE UPPER HOOD RIVER VALLEY, THE CLACKAMAS COUNTY CASCADE FOOTHILLS, AND THE LANE COUNTY CASCADE FOOTHILLS,
• A FROST ADVISORY IS IN EFFECT FROM 11 PM TONIGHT UNTIL 9 AM WEDNESDAY FOR THE CLATSOP COUNTY COAST, TILLAMOOK COUNTY COAST, THE CENTRAL COAST OF OREGON, THE NORTH OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE LOWLANDS, , THE LOWER COLUMBIA RIVER, THE TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, THE INNER PORTLAND METRO, EAST PORTLAND METRO, THE OUTER SOUTHEAST PORTLAND METRO, THE WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL  WILLAMETTE VALLEY, THE WEST COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT., AND THE WEST COLUMBIA RIVER GORGE I-84 CORRIDOR.
• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 8 AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A FREEZE WARNING IS IN EFFECT FROM 3 AM UNTIL 9 AM WEDNESDAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A FLOOD WARNING IS IN EFFECT UNTIL EARLY FRIDAY APRIL 19 TH 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 more sunshine.  The graphics for days 1-3  show no frontal systems approaching Oregon with little or no effect on our weather. The graphics for days 3-7 Friday through Tuesday show a frontal system offshore next Saturday moving across the Pacific Northwest between Saturday night and next Sunday.  A complex frontal system will be offshore Monday then moving in next Tuesday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

• Partly cloudy this evening, clear with areas of frost late tonight,
• Areas of AM frost, sunny and a bit warmer Wednesday afternoon, clear Wednesday night,
• Sunny and a bit warmer Thursday, mostly clear at night,
• Sunny and a bit warmer Friday, then partly cloudy Friday night.
• lows 32-44 highs 62-72.
• Mostly sunny and a bit cooler with a slight (20%) chance of rain Saturday, mostly cloudy in the evening showers, partly cloudy late Saturday night,
• Mostly sunny and a bit cooler Sunday, partly cloudy at night,
• Mostly sunny and a bit warmer Monday, partly cloudy Monday night,
• Then mostly sunny and a bit cooler with a slight (20%) chance of rain Tuesday.
• highs 67-65 warming to 69 Monday cooling to 66 Tuesday lows near 42. (seasonal averages high 61 low 40)

Forecast for the Umpqua Valley including Roseburg:

• Partly cloudy this evening, mostly clear with areas of frost late tonight,
• Areas of AM frost, sunny and a bit warmer Wednesday afternoon, mostly clear with areas of frost Wednesday night,
• Areas of AM frost, sunny and a bit warmer Thursday, mostly clear Thursday night,
• Sunny and a bit warmer Friday, then partly cloudy Friday night.
• lows 36-47 highs 63-76.
• Partly cloudy and a bit cooler with a slight (20%) chance of rain Saturday, partly cloudy Saturday night,
• Partly cloudy Sunday and at night,
• Partly cloudy and a bit warmer Monday and Monday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon.
• highs 70-72 cooling to 68 Tuesday lows near 44. (seasonal averages high 63 low 42)

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

• Partly cloudy early this evening, mostly clear tonight with patchy coastal frost late tonight while areas of inland frost late tonight,
• Areas of AM frost, sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Then sunny and a bit warmer Thursday and Friday, partly cloudy both nights,
• lows 35-45 highs 59-66.
• Partly cloudy with a slight (20%) chance of AM rain, mostly cloudy and a bit cooler with a slight (20%) chance of rain Saturday afternoon, just  partly cloudy Saturday night,
• Partly cloudy  Sunday and in the evening, mostly cloudy Sunday night,
• Mostly cloudy start, then partly cloudy and a bit warmer Monday afternoon and evening, mostly cloudy Monday night,
• Mostly cloudy with a slight (20%) chance of AM rain, then partly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon.
• highs 60-62 cooling back to 60 Tuesday lows 42-44. (seasonal average high 57 low 44)

Forecast for the Northern Oregon Cascades including Willamette Pass:

• Mostly cloudy this evening, mostly clear with widespread frost late tonight,
• Sunny and a bit warmer Wednesday, clear Wednesday night,
• Sunny and a bit warmer Thursday, mostly clear Thursday night,
• Sunny and a bit warmer Friday, then partly cloudy Friday night.
• free air freezing level 5,000 ft. falling to 3,500 ft. late tonight, 5,500 ft. Wednesday afternoon, 7,000 ft. falling to 6,500 ft. late Wednesday night, 8,000 ft. Thursday afternoon, 9,000 ft. Thursday night and Friday, then 10,000 ft. Friday night.
• lows 22-35 highs 48-60.
• Mostly sunny and a bit cooler with a slight (20%) chance of rain Saturday, mostly cloudy with a slight (20%) chance of rain and snow Saturday night,
• Mostly sunny and a bit warmer Sunday, partly cloudy Sunday night,
• Mostly sunny and a bit warmer Monday, partly cloudy with a slight (20%) chance of rain and snow Monday night,
• Then mostly sunny and a bit cooler with a slight (20%) chance of rain and snow Tuesday.
• snow level 6,500 ft. Saturday, 6,000 ft. Saturday night, free air freezing level 8,000 ft. Sunday, 10,000 ft. Sunday night, 11,000 ft. Monday, then snow level 6,500 ft. Monday night and Tuesday.
• highs 57-59 cooling to 57 Tuesday lows 32-36.