Weather Alert in Maryland
Special Weather Statement issued February 27 at 4:08AM EST by NWS Baltimore MD/Washington DC
AREAS AFFECTED: Washington; Frederick; Carroll; Northern Baltimore; Cecil; Southern Baltimore; Northwest Montgomery; Central and Southeast Montgomery; Northwest Howard; Central and Southeast Howard; Northwest Harford; Southeast Harford; Augusta; Rockingham; Shenandoah; Frederick; Page; Warren; Clarke; Albemarle; Greene; Madison; Rappahannock; Orange; Culpeper; Fairfax; Northern Fauquier; Southern Fauquier; Eastern Highland; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park; Hampshire; Berkeley; Jefferson; Hardy; Eastern Grant; Eastern Pendleton
DESCRIPTION: Patchy fog has developed across much of the region, especially in valleys and other low lying areas. While visibilities may be variable, some fog is locally dense with visibility less than one quarter mile. Temperatures in many of these locations have fallen into the upper 20s and lower 30s, which could result in freezing fog. Any residual moisture from Thursday's rain could also result in icy spots. Expect the fog to gradually erode by mid morning. If driving early this morning, be prepared for rapidly changing conditions. Slow down, increase following distance, and use low beam headlights when encountering dense fog. Any road surfaces which appear wet may actually be icy.
INSTRUCTION: N/A
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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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