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 Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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