Weather Alerts for Oregon
1. Fire Weather Watch for: Burns BLM; Southern Grasslands; Central Canyonlands; Northwestern Vale BLM
2. Fire Weather Watch for: Klamath Basin and the Fremont-Winema National Forest; South Central Oregon Desert including the BLM Land in Eastern Lake and Western Harney Counties
3. Fire Weather Watch for: Lower Columbia Basin of Oregon; Lower Columbia Basin
4. Heat Advisory for: Lower Columbia Basin of Oregon; Foothills of the Northern Blue Mountains of Oregon; Yakima Valley; Lower Columbia Basin of Washington; Foothills of the Blue Mountains of Washington
5. Red Flag Warning for: John Day Valley; Central Mountains of Oregon; Southern Deschutes National Forest
6. Red Flag Warning for: Klamath Basin and the Fremont-Winema National Forest; South Central Oregon Desert including the BLM Land in Eastern Lake and Western Harney Counties
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North America Water Vapor (Moisture)
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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