Weather Alerts for Oregon
1. Freeze Warning for: Eastern Curry County and Josephine County; Jackson County
2. Freeze Watch for: Benton County Lowlands; Linn County Lowlands; Lane County Lowlands; Upper Hood River Valley; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills
3. Frost Advisory for: Central Douglas County
4. Frost Advisory for: North Oregon Coast Range Lowlands; Central Oregon Coast Range Lowlands; North Oregon Coast Range; Central Oregon Coast Range; Lower Columbia River; Tualatin Valley; West Hills and Chehalem Mountains; Outer Southeast Portland Metro; West Central Willamette Valley; East Central Willamette Valley; West Columbia River Gorge of Oregon above 500 ft; Clackamas County Cascade Foothills; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills
5. Frost Advisory for: South Central Oregon Coast
6. Wind Advisory for: Eastern Columbia River Gorge of Oregon; Lower Columbia Basin of Oregon; Foothills of the Southern Blue Mountains of Oregon; North Central Oregon; Eastern Columbia River Gorge of Washington; Kittitas Valley; Simcoe Highlands
7. Winter Storm Warning for: Cascades of Marion and Linn Counties; Cascades of Lane County
8. Winter Storm Warning for: East Slopes of the Oregon Cascades
9. Winter Storm Warning for: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
10. Winter Weather Advisory for: Klamath Basin; Northern and Eastern Klamath County and Western Lake County
11. Winter Weather Advisory for: North Oregon Cascades; South Washington Cascades
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Weather Topic: What are Altocumulus Clouds?
Home - Education - Cloud Types - Altocumulus Clouds
Next Topic: Altostratus Clouds
Similar to cirrocumulus clouds, altocumulus clouds are
characterized by cloud patches. They are distinguished by larger cloudlets
than cirrocumulus clouds but are still smaller than stratocumulus clouds.
Altocumulus clouds most commonly form in middle altitudes (between 2 and 5 km)
and may resemble, at times, the shape of a flying saucer.
These uncommon formations, called altocumulus lenticularis, are created by uplift
in the atmosphere and are most often seen in close proximity to mountains.
Next Topic: Altostratus Clouds
Weather Topic: What are Cirrocumulus Clouds?
Home - Education - Cloud Types - Cirrocumulus Clouds
Next Topic: Cirrostratus Clouds
Cirrocumulus clouds form at high altitudes (usually around 5 km)
and have distinguishing characteristics displayed in a fine layer of
small cloud patches. These small cloud patches are sometimes referred to as
"cloudlets" in relation to the whole cloud formation.
Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the
water droplets in the cloud freeze into ice crystals and the cloud becomes a
cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud
formations generally pass rapidly.
Next Topic: Cirrostratus Clouds
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