Weather Alerts for Montana
1. Cold Weather Advisory for: Daniels; Sheridan; Northern Phillips; Northern Valley
2. Cold Weather Advisory for: East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty
3. Cold Weather Advisory for: Hill County; Northern Blaine County; Southern Rocky Mountain Front; Southern High Plains; Eastern Pondera and Eastern Teton; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Cascade County below 5000ft; Upper Blackfoot and MacDonald Pass; Gates of the Mountains
4. Cold Weather Advisory for: Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
5. Winter Weather Advisory for: Musselshell; Treasure; Northern Rosebud; Custer; Northern Stillwater; Powder River; Carter; Golden Valley; Northern Big Horn; Southern Rosebud; Southern Big Horn; Bighorn Canyon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills
6. Winter Weather Advisory for: Northern Park; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland
7. Winter Weather Advisory for: Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
8. Winter Weather Advisory for: Red Lodge Foothills; Southeastern Carbon; Northern Carbon
9. Winter Weather Advisory for: West Glacier Region
10. Winter Weather Advisory for: Western and Central Chouteau County; Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
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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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