Weather Alert in Pennsylvania
Winter Storm Watch issued March 16 at 2:28AM EDT until March 18 at 8:00AM EDT by NWS Cleveland OH
AREAS AFFECTED: Southern Erie
DESCRIPTION: * WHAT...Heavy lake effect snow possible. Total snow accumulations between 5 and 9 inches possible. Winds could gust as high as 45 mph. * WHERE...Southern Erie County. * WHEN...From this evening through Wednesday morning. * IMPACTS...Plan on slippery conditions with with slower travel likely The hazardous conditions could impact the Tuesday morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Rain showers will change to snow showers this afternoon, with bands of locally heavy lake effect snow expected to develop tonight as arctic air moves into the region. The lake effect snow will persist into Tuesday night before gradually tapering off. The snowfall amounts will depend on the placement and duration of the most persistent snow bands. In addition, west winds will continue to gust to 35 to 45 mph at times tonight and Tuesday morning leading to blowing snow and poor visibility where the bands persist.
INSTRUCTION: Monitor the latest forecasts for updates on this situation.
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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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