Jul
09.
Here is my weekly weather quiz question for the last time. What is a “Mesocyclone? ” Here is the correct answer. Mesocyclone (abbrev. MESO)- A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in the right rear flank of a supercell (or often on the eastern, or front, flank of an HP storm). The circulation of a mesocyclone covers an area much larger than the tornado that may develop within it. Properly used, mesocyclone is a radar term; it is defined as a rotation signature appearing on Doppler radar that meets specific criteria for magnitude, vertical depth, and duration. It will appear as a yellow solid circle on the Doppler velocity products. Therefore, a mesocyclone should not be considered a visually-observable phenomenon (although visual evidence of rotation, such as curved inflow bands, may imply the presence of a mesocyclone).
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An Upper Level High Pressure Ridge (“Arch” shape offshore) will keep up the onshore airflow. Still no chance of getting the much needed rain for the Willamette Valley and Eastern Oregon. The graphics for days 1-3 show no frontal systems approaching the coast. The graphics for days 3-7 Wednesday through Sunday show a cold front well to the Northwest Friday and next Saturday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 31 in the Good category measuring Ozone.
Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 26 in the Good category measuring Ozone.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES
- NONE AT THIS TIME.
HEALTH ADVISORIES:
- A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR THE SOUTHERN PORTION OF UPPER KLAMATH LAKE, FROM HOWARD’S BAY SOUTH TO THE LINK RIVER DAM IN KLAMATH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE RESERVOIR WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE GALESVILLE RESERVOIR AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY.. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.
- 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.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:,
- Partly cloudy tonight,
- AM clouds, sunny Monday, mostly clear Monday night,
- Some AM clouds, sunny and a bit warmer Tuesday afternoon, mostly clear at night,
- AM clouds and sun, sunny Wednesday afternoon, then clear Wednesday night.
- lows 52-50 warming back to 52 Tuesday night cooling back to 50 Wednesday night highs 79-83.
- Sunny and a bit warmer Thursday, Friday, and Saturday, clear each night,
- Then sunny and a bit cooler Sunday.
- highs 86-94 cooling to 92 Sunday lows 53-56. (seasonal averages high 83 low 51)
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Eugene-Springfield Pollen Count:
Grass Pollen: Moderate (6)
Weeds: Low (5)
Tree Pollen: Low (6)
Last counted: 7.9.23
Data courtesy of Oregon Allergy Associates.
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Forecast for the Umpqua Valley including Roseburg:
- Clear this evening, mostly cloudy late tonight,
- AM clouds, sunny and a bit cooler Monday afternoon, mostly clear Monday night,
- Some AM clouds, sunny and a bit warmer Tuesday afternoon, mostly clear at night,
- Sunny and a bit warmer Wednesday, then clear Wednesday night.
- lows near 55 highs 82-86.
- Sunny and a bit warmer Thursday, Friday and Saturday, clear each night,
- The sunny and a bit cooler Sunday.
- highs near 90-97 cooling to 95 Sunday lows 58-62. (seasonal averages high 85 low 57)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with patchy coastal drizzle and patchy fog late tonight while clear inland this evening and mostly cloudy with patchy inland fog late tonight,
- Mostly cloudy with patchy AM fog and drizzle, partly cloudy and a bit warmer Monday afternoon, mostly clear in the evening, partly cloudy late Monday night,
- AM clouds, sunny Tuesday afternoon, mostly clear in the evening, mostly cloudy late at night,
- AM clouds, sunny Wednesday afternoon, then mostly clear Wednesday night.
- lows near 52 highs near 70.
- Mostly sunny and a bit warmer Thursday, Friday, and Saturday, mostly clear each night.
- Then mostly sunny and a bit cooler Sunday.
- highs 72-74 cooling to 72 Sunday lows near 53. (seasonal averages high 66 low 53)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Partly cloudy with a slight (20%) chance of showers and thunderstorms tonight,
- Some AM clouds, sunny and a bit cooler Monday afternoon, mostly clear Monday night,
- Sunny and a bit warmer Tuesday, then mostly clear Tuesday night,
- Mostly sunny and a bit cooler Wednesday, clear Wednesday night.
- snow level above 8,000 ft. tonight, free air freezing level 13,000 ft. Monday, 14,000 ft. Monday night and Tuesday, 14,000 ft. falling to 13,000 ft. late Tuesday night, 13,000 ft. Wednesday, then 14,000 ft, Wednesday night.
- lows 42-44 highs 69-72 cooling to 70 Wednesday.
- Sunny and a bit warmer Thursday, clear at night,
- Sunny and a bit warmer Friday and Saturday, clear both nights,
- Then sunny and a bit cooler Sunday.
- free air freezing level 14,000 ft. Thursday, 15,000 ft. Thursday night, 16,000 ft. Friday, then above 16,000 ft. Friday night through Sunday.
- highs 75-86 cooling to 82 Sunday lows 44-50.
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For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com
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