Weather Alert in North Carolina
Special Weather Statement issued February 19 at 7:03PM EST by NWS Wakefield VA
AREAS AFFECTED: Gates; Pasquotank; Camden; Western Currituck; Perquimans; Eastern Currituck; Southampton; Isle of Wight; Norfolk/Portsmouth; Suffolk; Chesapeake; Virginia Beach; Newport News; Hampton/Poquoson
DESCRIPTION: Cameras and observations indicate that patchy dense fog has developed in Southeastern Virginia and Northeast North Carolina. Visibilities will average between one half and two miles, but could drop to less than a mile at times. The fog will persist for at least late tonight into early tomorrow morning. Motorists should be alert for sudden changes in visibility due to the areas of fog. Drive at reduced speeds and use low beam headlights only.
INSTRUCTION: N/A
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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