Weather Alert in California

Recent Locations: San Francisco, CA  
Current Alerts for San Francisco, CA: Special Weather Statement

Wind Advisory issued March 30 at 10:01AM PDT until March 31 at 9:00PM PDT by NWS Las Vegas NV

AREAS AFFECTED: White Mountains of Inyo County; Esmeralda and Central Nye County; Lincoln County; Sheep Range

DESCRIPTION: * WHAT...Southwest winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...White and Inyo Mountains, Esmeralda and Central Nye County, Lincoln County, and Sheep Range. * WHEN...From 8 AM to 9 PM PDT Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

INSTRUCTION: Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

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Current U.S. National Radar--Current

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North America Water Vapor (Moisture)

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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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