Weather Alert in Oregon
Winter Storm Warning issued March 31 at 10:42AM PDT until April 2 at 5:00PM PDT by NWS Medford OR
AREAS AFFECTED: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
DESCRIPTION: * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches, with 24 to 30 inches in Crater Lake National Park. Winds gusting as high as 50 mph over high and exposed terrain. * WHERE...The southern Oregon Cascades north of Howard Prairie Lake, and the eastern Douglas County Foothills above 3000 ft, including the passes along highways 140, 62, 138, 230, and 58. * WHEN...From 5 AM Wednesday to 5 PM PDT Thursday. * IMPACTS...Travel may be very difficult to impossible. The hazardous conditions could impact the Wednesday morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...The heaviest snow is expected Wednesday afternoon when 1 in/hr rates are highly likely (>90% chance) and there is a 60-80% chance of 2 in/hr snowfall rates.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Call 511 or visit tripcheck.com for road information.
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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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