Weather Alert in California

Recent Locations: Mountain Ranch, CA   Yelm, WA   Calimesa, CA  

Dense Smoke Advisory issued September 7 at 3:12PM PDT until September 8 at 11:00AM PDT by NWS Reno NV

AREAS AFFECTED: Mono

DESCRIPTION: * WHAT...Dense smoke reducing visibility to 1 mile or less at times. Smoke will also lead to degraded air quality. * WHERE...Mono County. * WHEN...Until 11 AM PDT Monday. * IMPACTS...Hazardous travel due to reduced visibility, especially along US-395 and over southern Mono County. Poor air quality may cause health issues for those with respiratory illnesses. * ADDITIONAL DETAILS...For details on health impacts and recommended precautions, please consult the Great Basin Unified Air Pollution Control District at GBUAPCD.org and AirNow.gov.

INSTRUCTION: Persons with respiratory illnesses should remain indoors to avoid inhaling smoke.

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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 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

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

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

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