Weather Alerts for Montana
1. Lake Wind Advisory for: Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
2. Winter Storm Warning for: Little Belt and Highwood Mountains; Gallatin and Madison County Mountains and Centennial Mountains
3. Winter Storm Watch for: Absaroka/Beartooth Mountains; Crazy Mountains
4. Winter Storm Watch for: Bighorn Canyon
5. Winter Storm Watch for: Bitterroot/Sapphire Mountains; Butte/Blackfoot Region; Potomac/Seeley Lake Region
6. Winter Storm Watch for: Custer; Fallon; Powder River; Carter
7. Winter Storm Watch for: Dawson; Prairie; Wibaux
8. Winter Storm Watch for: Northern Big Horn; Southwestern Yellowstone
9. Winter Storm Watch for: Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
10. Winter Storm Watch for: Southern Big Horn
11. Winter Storm Watch for: Southern Rosebud
12. Winter Storm Watch for: Treasure; Northern Rosebud; Northeastern Yellowstone
13. Winter Weather Advisory for: Big Belt, Bridger and Castle Mountains
14. Winter Weather Advisory for: Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
15. Winter Weather Advisory for: East Glacier Park Region
16. Winter Weather Advisory for: Southern Big Horn
17. Winter Weather Advisory for: Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass; Elkhorn and Boulder Mountains; Northwest Beaverhead County
18. Winter Weather Advisory for: Southern Rosebud
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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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