Weather Alert in California
Winter Storm Watch issued February 13 at 11:06AM PST until February 18 at 10:00PM PST by NWS Reno NV
AREAS AFFECTED: Lassen-Eastern Plumas-Eastern Sierra Counties
DESCRIPTION: * WHAT...Heavy snow. Snow accumulations 6 to 12 inches west of Highway 395, with local high elevation totals west of Highway 89 up to 2 feet. This includes locations such as Plumas Eureka, Graeagle, Portola, and Lake Davis. For valley locations along and east of Highway 395, 2 to 6 inches, including Susanville, Janesville, Standish, and Doyle. Wind gusts 35 to 45 mph with up to 65 mph for wind prone locations along US-395. * WHERE...Lassen-Eastern Plumas-Eastern Sierra Counties. * WHEN...From Sunday evening through Wednesday evening. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning and evening commutes. * ADDITIONAL DETAILS...Elevations below 5000 feet will initially start as rain, changing to snow Monday afternoon into evening for all elevations.
INSTRUCTION: Monitor the latest forecasts for updates on this situation. Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.
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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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