Weather Alert in California

Recent Locations: Vidal, CA  

Winter Weather Advisory issued May 3 at 5:12AM PDT until May 4 at 11:00PM PDT by NWS Las Vegas NV

AREAS AFFECTED: Eastern Sierra Slopes of Inyo County

DESCRIPTION: * WHAT...Snow expected above 8000 feet. Total snow accumulations up to 4 inches. Winds gusting as high as 40 mph. * WHERE...Eastern Sierra Slopes. * WHEN...From 5 PM this afternoon to 11 PM PDT Sunday. * IMPACTS...This late season winter storm will pose a significant risk to those hikers and outdoor recreationalists not prepared for winter conditions. The combination of low temperatures, gusty winds and accumulating snow will make for hazardous conditions. * ADDITIONAL DETAILS...Snow levels will vary between 8000 feet and 9000 feet.

INSTRUCTION: Slow down and use caution while traveling. Call 1-800-427-7623 for road information.

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Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle

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