Weather Alert in California
Winter Storm Warning issued February 17 at 11:57AM PST until February 20 at 7:00AM PST by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Northern Ventura County Mountains; Eastern San Gabriel Mountains
DESCRIPTION: * WHAT...Heavy snow possible. Total snow accumulations of up to 4 inches between 3500 and 4500 feet, 6 to 12 inches for 4500 to 6000 feet, and 1 to 2 feet above 6000 feet. Wind gusts of up to 60 to 70 mph possible this afternoon through late tonight, and again late Wednesday night into Thursday morning. * WHERE...Eastern San Gabriel Mountains and Northern Ventura County Mountains. * WHEN...Until 7 AM PST Friday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could become treacherous. Visibilities may drop below one-quarter mile due to falling and blowing snow. Damaging winds could blow down trees and power lines. * ADDITIONAL DETAILS...There will be a break in the snowfall for Tuesday into Tuesday night, before heavy snow returns by Wednesday. However, blowing and drifting snow producing significant visibility restrictions will continue above 6000 feet elevation, even during the break in snowfall.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
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Weather Topic: What are Contrails?
Home - Education - Cloud Types - 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
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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