Weather Alert in California

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Current Alerts for Grand Terrace, CA: Wind Advisory Winter Storm Warning

Avalanche Warning issued February 17 at 6:11AM PST by NWS Las Vegas NV

AREAS AFFECTED: Eastern Sierra Slopes of Inyo County

DESCRIPTION: AVWVEF The Eastern Sierra Avalanche Center in Mammoth Lakes has issued a Backcountry Avalanche Warning for the following areas: the Eastern Sierra in Mono County and the Eastern Sierra in Inyo County * WHAT...Eastern Sierra Avalanche Center is issuing an avalanche warning due to High Avalanche Danger. * WHERE...Eastern High Sierra between Bishop Pass and Virginia Lakes. * WHEN...Until 7 AM Wednesday. * IMPACTS...Heavy snowfall and strong winds are rapidly loading a poor snowpack structure creating widespread areas of unstable snow. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions. Travel in avalanche terrain is not recommended. Avalanches may run long distances and can run into mature forests, valley floors, or flat terrain. Consult http://www.esavalanche.org or www.avalanche.org for more detailed information Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.

INSTRUCTION: N/A

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Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

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Weather Topic: What is Precipitation?

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Precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

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