Weather Alert in New Hampshire
Winter Weather Advisory issued March 22 at 2:20AM EDT until March 23 at 12:00AM EDT by NWS Gray ME
AREAS AFFECTED: Northern Coos; Southern Coos; Northern Grafton; Southern Grafton; Sullivan; Merrimack; Belknap; Strafford
DESCRIPTION: * WHAT...Mixed precipitation expected. Total snow accumulations between 3 and 6 inches and ice accumulations around a light glaze. * WHERE...Portions of central and northern New Hampshire. * WHEN...Until midnight EDT tonight. * IMPACTS...Light snowfall accumulations are expected as periods of snow impact the region. Be prepared for variable travel conditions and slow down when you approach areas of heavier snowfall as road conditions could change rapidly. Difficult travel conditions are possible due to icy road conditions. This is especially true on untreated side roads. Periods of moderate and heavy snow will combine with low visibility to create dangerous driving conditions.
INSTRUCTION: Slow down and use caution while traveling. The latest road conditions can be obtained by going to newengland511.org
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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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