Here is my weekly weather quiz question for the last time. What is “Sublimation”? Sublimation is the transition of a substance from the solid phase directly to the vapor phase, or vice versa, without passing through an intermediate liquid phase. Thus an ice crystal or icicle sublimes under low relative humidity at temperatures below 0°C. The process is analogous to evaporation of a liquid.
____________
An Upper Level High Pressure Ridge (“Arch” shape) is moving toward the coast. The graphics for days 1-3 show a cold front offshore pushing through today and Sunday. The graphics for days 3-7 Tuesday through Saturday show a warm front pushing northward through the Pacific Northwest Thursday followed by it’s associated cold front sliding through between Friday.
Note: Lane County residents will have to wait until Friday, November 1, 2024, at the earliest for the opening of the fall outdoor burning season. The season is typically scheduled to start on October 1st each year. However, the decision to delay has been jointly made by the Lane County Fire Defense Board and the Oregon Department of Forestry (ODF).
ADVISORIES:
- A FREEZE WARNING IS IN EFFECT FROM 3 AM MDT UNTIL 10 AM MDT TODAY FOR THE OREGON LOWER TREASURE VALLEY.
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.
Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Mostly sunny warmer today, mostly clear this evening, partly cloudy with patchy dense fog late tonight,
- Patchy AM dense fog with a slight (20%) chance of rain, a mix of clouds and sun and a bit cooler with rain Sunday afternoon, rain at night,
- Mostly cloudy and a bit cooler with rain Monday, partly cloudy with a slight (20%) chance of evening rain, then mostly cloudy with a slight (20%) chance of rain late Monday night.
- highs 72-60 lows 48-42.
- A mix of clouds and sun and a bit warmer Tuesday, partly cloudy Tuesday night,
- Mostly sunny and a bit warmer Wednesday, mostly clear in the evening, partly cloudy late at night,
- A mix of clouds and sun Thursday, mostly cloudy with a (40%) chance of showers Thursday night,
- Then mostly cloudy and a bit cooler with showers likely (70%) Friday.
- highs 63-66 cooling to 62 Friday lows 46-52 cooling to 50 Friday night. (seasonal averages high 63 low 41)
Your College Football Weather Forecast:
Today Friday October 18th:
Ducks vs Perdue Boilermakers at Ross-ADE Stadium, West Lafayette, Indiana: Game time: 5:00 pm- The Ducks shut out Perdue 35-0.
Saturday October 19th:
Beavers vs UNLV Rebels at Reser Stadium: Game time 7:00 pm- Weather Forecast: Partly cloudy 64 degrees and cooling throughout the game.
________________
HOME WOOD HEATING ADVISORY:
Eugene & Springfield: GREEN Fireplace and wood stove use permitted.
Oakridge and Westfir: GREEN Fireplace and wood stove use permitted.
The use of pellet stoves is always allowed.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
________________
Forecast for the Umpqua Valley including Roseburg:
- Sunny and warmer today, mostly clear with patchy fog tonight,
- Partly cloudy start, mostly cloudy with a (30%) chance of rain and a bit cooler Sunday afternoon, rain at night,
- Mostly cloudy with AM rain, rain likely (70%) and a bit cooler Monday afternoon, partly cloudy with a slight (2o%) chance of evening rain, then mostly cloudy and colder with patchy fog late Monday night.
- highs 79-65 lows 50-52 cooling to 45 Monday night.
- Mostly cloudy start, partly cloudy and a bit cooler Tuesday afternoon, partly cloudy Tuesday night,
- Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
- Partly cloudy and a bit warmer with a slight (20%) chance of rain Thursday afternoon,
- Mostly cloudy with a (40%) chance of AM rain, then rain likely (70%) and a bit cooler Friday afternoon.
- highs 63-72 cooling to 68 Friday lows 43-49. (seasonal averages high 65 low 44)
____________
Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Sunny and a bit warmer today, mostly cloudy with a slight (20%) coastal rain at night while partly cloudy with inland patchy fog late tonight,
- Mostly cloudy with a slight (20%) chance of AM coastal rain with coastal rain likely (70%) and a bit cooler Sunday afternoon while a bit cooler with a (40%) chance of rain Sunday afternoon, rain at night,
- Mostly cloudy with AM rain likely (70%), mostly cloudy with a good (50%) chance of rain and a bit cooler Monday afternoon, a slight (20%) chance of evening rain, then just mostly cloudy late Monday night.
- highs 63-69 cooling to 65 Sunday lows 50-46.
- Mostly cloudy start, partly cloudy and a bit warmer Tuesday and Wednesday, partly cloudy both nights,
- Partly cloudy with a slight (20%) chance of rain Thursday afternoon, mostly cloudy with a good (50%) chance of rain Thursday night,
- Mostly cloudy with a good (50%) chance of AM rain, then rain likely (70%) Friday afternoon.
- highs 60-63 lows 45-48. (seasonal average high 62 low 47).
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly sunny and warmer today, partly cloudy tonight,
- Mostly sunny with a slight (20%) chance of AM rain, a bit cooler with a good (50%) chance of rain Sunday afternoon, rain at night,
- Mostly cloudy and cooler with rain Monday, then mostly cloudy with a good (50%) chance of rain Monday night.
- free air freezing level 13,000 ft. today and tonight, snow level above 8,000 ft. Sunday and Sunday night, 6,500 ft. Monday, then 6,000 ft. Monday night.
- highs 62-45 lows 42-32.
- Mostly sunny and a bit warmer Tuesday and Wednesday, partly cloudy both nights,
- Mostly sunny and a bit warmer Thursday, mostly cloudy with a (40%) chance of showers Thursday night,
- Mostly cloudy and a bit cooler with showers likely (70%) chance of showers Friday.
- free air freezing level 10,000 ft. Tuesday, 11,000 ft. Tuesday night, 12,000 ft. Wednesday, 13,000 ft. Wednesday night, 11,000 ft. Thursday, snow level 7,500 ft. Thursday night, then 7,000 ft. Friday.
- highs 50-59 cooling back to 50 Friday lows 32-37.