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; Powder River; Carter; Northern Big Horn; Southern Rosebud; Southern Big Horn; Bighorn Canyon; Northeastern Yellowstone; Sheridan Foothills
6. Winter Weather Advisory for: Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
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Current U.S. National Radar--Current
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National Weather Forecast--Current
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National Weather Forecast for Tomorrow
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North America Water Vapor (Moisture)
This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.
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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