Weather Alert in Virginia
Extreme Cold Warning issued February 7 at 3:12AM EST until February 8 at 10:00AM EST by NWS Wakefield VA
AREAS AFFECTED: Norfolk/Portsmouth; Virginia Beach
DESCRIPTION: * WHAT...For the Cold Weather Advisory, very cold wind chills as low as 3 above expected. For the High Wind Warning, northwest winds 25 to 35 mph with gusts up to 55 mph expected. For the Extreme Cold Warning, dangerously cold wind chills as low as 1 below expected. * WHERE...Norfolk/Portsmouth County, and Virginia Beach. * WHEN...For the Cold Weather Advisory, from 6 AM this morning to 10 PM EST this evening. For the High Wind Warning, from 8 AM this morning to 9 PM EST this evening. For the Extreme Cold Warning, from 10 PM this evening to 10 AM EST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. The cold wind chills as low as 1 below zero could result in hypothermia if precautions are not taken.
INSTRUCTION: Remain in the lower levels of your home during the windstorm, and avoid windows. Watch for falling debris and tree limbs. Use caution if you must drive. Dress in layers including a hat, face mask, and gloves if you must go outside. Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.
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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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