Weather Alerts for Oregon
1. Freeze Warning for: South Central Oregon Coast; Curry County Coast
2. Freezing Fog Advisory for: Northern Blue Mountains of Oregon
3. Winter Storm Warning for: Central Douglas County
4. Winter Storm Warning for: Eastern Curry County and Josephine County
5. Winter Storm Warning for: Jackson County
6. Winter Storm Warning for: Northern Blue Mountains of Oregon; Northwest Blue Mountains
7. Winter Weather Advisory for: Central Douglas County
8. Winter Weather Advisory for: East Slopes of the Oregon Cascades
9. Winter Weather Advisory for: Eastern Curry County and Josephine County
10. Winter Weather Advisory for: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
11. Winter Weather Advisory for: Grande Ronde Valley; Wallowa County; Southern Blue Mountains of Oregon
12. Winter Weather Advisory for: Jackson County
13. Winter Weather Advisory for: John Day Basin; Foothills of the Northern Blue Mountains of Oregon; Foothills of the Blue Mountains of Washington
14. Winter Weather Advisory for: North Oregon Cascades; Cascades of Marion and Linn Counties; Cascades of Lane County; South Washington Cascades
15. Winter Weather Advisory for: North Oregon Coast Range; Central Oregon Coast Range; Clackamas County Cascade Foothills; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills; Willapa Hills; South Washington Cascade Foothills
16. Winter Weather Advisory for: Ochoco-John Day Highlands
17. Winter Weather Advisory for: South Central Oregon Coast; Curry County Coast
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Current U.S. National Radar--Current
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North America Water Vapor (Moisture)
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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