Here is my weekly weather quiz question for the last time. “What is the “Saffir-Simpson Hurricane Wind Scale?” Here is the correct answer. The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 categorization based on the hurricane’s intensity at the indicated time. The scale provides examples of the type of damage and impacts in the United States associated with winds of the indicated intensity. In general, damage rises by about a factor of four for every category increase. The maximum sustained surface wind speed (peak 1-minute wind at the standard meteorological observation height of 10 m [33 ft] over unobstructed exposure) associated with the cyclone is the determining factor in the scale. The scale does not address the potential for other hurricane-related impacts, such as storm surge, rainfall-induced floods, and tornadoes.
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An Upper Level Low Pressure Trough (“U” shape) allows frontal movement through the Pacific Northwest. The graphics for days 1-3 show no frontal systems moving through the Pacific Northwest. The graphics for days 3-7 Wednesday through Sunday show no frontal systems pushing through the Pacific Northwest until a cold front moves through next Sunday.
ADVISORIES:
- A FREEZE WARNING IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 8 AM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE 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.
Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy with a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, partly cloudy with patchy fog late tonight (under 0.10 in. of rain, more in storms),
- Patchy AM and late night fog, mostly sunny and a bit warmer Monday afternoon, mostly clear Monday night,
- Sunny and a bit warmer Tuesday, clear at night,
- Sunny and a bit warmer Wednesday (Juneteenth), then mostly clear Wednesday night.
- lows 42-50 highs 67-83.
- Sunny and a bit warmer Thursday (Summer Solstice 1:50 pm), partly cloudy in the evening, mostly clear late Thursday night,
- Sunny and a bit warmer Friday, mostly clear at night,
- Sunny and a bit cooler Saturday, mostly clear Saturday night,
- Then mostly sunny and a bit cooler Sunday.
- highs 85-87 cooling to 77 Sunday lows near 52. (seasonal averages high 74 low 48)
Forecast for the Umpqua Valley including Roseburg:
- Partly cloudy with a (30%) chance of early evening showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of late evening rain, just partly cloudy late tonight,
- Mostly cloudy start, partly cloudy and warmer Monday afternoon, mostly clear Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Mostly sunny and a bit warmer Wednesday afternoon (Juneteenth), then mostly clear Wednesday night.
- lows 46-54 highs 78-86.
- Partly cloudy and a bit warmer Thursday (Summer Solstice 1:50 pm), mostly clear Thursday night,
- Mostly sunny and a bit warmer Friday, mostly clear Friday night,
- Then mostly sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night,
- highs 87-89 cooling to 80 Sunday lows 54-56 cooling back to 54 Saturday night. (seasonal average high 76 low 52)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Partly cloudy tonight,
- Partly cloudy and a bit warmer Monday, mostly clear in the evening, partly cloudy late Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Sunny and a bit warmer Wednesday (Juneteenth), then partly cloudy Wednesday night.
- lows 44-50 highs 64-69.
- Partly cloudy Thursday (Summer Solstice 1:50 pm) and in the evening, mostly cloudy late Thursday night,
- Partly cloudy Friday and at night,
- Partly cloudy Saturday, partly cloudy Saturday night,
- Mostly cloudy start, then partly cloudy and a bit cooler Sunday afternoon.
- highs 68-70 cooling to 66 Sunday lows 52-50 warming back to 52 Saturday night. (seasonal average high 64 low 51)
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with evening rain showers likely (70%) with possible snow showers and thunderstorms, a (40%) chance of snow showers with a slight (20%) chance of rain showers late tonight (0.25 in. of rain possible, more in storms, 2 in. of snow possible),
- A mix of clouds and sun and a bit warmer Monday, partly cloudy Monday night,
- Sunny and warmer Tuesday, mostly clear at night,
- Sunny and warmer Wednesday (Juneteenth), then mostly clear Wednesday night.
- snow level 4,500 ft. tonight, free air freezing level 5,000 ft. rising to 6,000 ft. Monday, 7,000 ft. Monday night, 8,000 ft. rising to 9,000 ft. Tuesday afternoon, 110,000 ft. rising to 11,000 ft. late Tuesday night, 11,000 ft. Wednesday, then 12,000 ft. Wednesday night.
- lows 30-40 highs 50-65.
- Mostly sunny and a bit warmer Thursday (Summer Solstice 1:50 pm), partly cloudy in the evening, clear late Thursday night,
- Sunny and a bit warmer Friday, mostly clear at night,
- Then sunny and a bit cooler Saturday and Sunday, clear Saturday night,
- free air freezing level 13,000 ft. Thursday through Friday, 14,000 ft. Friday night, then 15,000 ft. Saturday through Sunday.
- highs 72-75 lows 44-47.