Weather Alert in California

Current Alerts for San Fernando, CA: Flood Watch High Surf Advisory
Wind Advisory

Avalanche Watch issued February 15 at 7:10AM PST by NWS Reno NV

AREAS AFFECTED: Mono

DESCRIPTION: AVAREV The following message is transmitted at the request of the Eastern Sierra Avalanche Center. The Eastern Sierra Avalanche Center in Mammoth Lakes has issued a BACKCOUNTRY AVALANCHE WATCH for the following areas: NWS Las Vegas NV - CA-519 (Eastern Sierra in Inyo County) NWS Reno NV - CA-073 (Eastern Sierra in Mono County) * WHAT...The avalanche danger is expected to rise to HIGH by Monday afternoon (February 16) and remain elevated through mid- week. * WHERE...The eastern Sierra Nevada from Virginia Lakes to the southern end of Bishop Creek. * WHEN...In effect from Monday 7 AM PST to Tuesday 7 AM PST. * IMPACTS...Heavy snow and extreme winds will create widespread areas of unstable snow. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions are expected to develop. Avalanches may run long distances, into mature forests, valley floors, or flat terrain. Travel in avalanche terrain is not recommended. 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.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

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.

Next Topic: Rain

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