Weather Alerts for Idaho
1. Freeze Warning for: Arco/Mud Lake Desert
2. Freeze Warning for: Arco/Mud Lake Desert
3. Freeze Warning for: Lower Treasure Valley; Upper Treasure Valley; Western Magic Valley; Oregon Lower Treasure Valley
4. Freeze Warning for: Lower Treasure Valley; Upper Treasure Valley; Western Magic Valley; Oregon Lower Treasure Valley
5. Freeze Warning for: Shoshone/Lava Beds; Upper Snake River Plain; Lower Snake River Plain; Eastern Magic Valley
6. Freeze Warning for: Shoshone/Lava Beds; Upper Snake River Plain; Lower Snake River Plain; Eastern Magic Valley
7. Special Weather Statement for: West Central Mountains; Upper Weiser River; Baker County
8. Wind Advisory for: Arco/Mud Lake Desert
9. Wind Advisory for: Beaverhead/Lemhi Highlands
10. Wind Advisory for: Southwest Highlands; Southern Twin Falls County; Harney County; Malheur County
11. Winter Weather Advisory for: Bear River Range; Centennial Mountains/Island Park
12. Winter Weather Advisory for: Central Panhandle Mountains
13. Winter Weather Advisory for: Frank Church Wilderness; Sawtooth/Stanley Basin; Sun Valley Region; Big Lost Highlands/Copper Basin
14. Winter Weather Advisory for: Northern Clearwater Mountains; Southern Clearwater Mountains
15. Winter Weather Advisory for: Western Lemhi County; Eastern Lemhi County
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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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