Weather Alert in North Carolina
Special Weather Statement issued April 4 at 6:46PM EDT by NWS Blacksburg VA
AREAS AFFECTED: Surry; Carroll; Patrick
DESCRIPTION: At 642 PM EDT, Doppler radar was tracking cluster of thunderstorms over Cana, moving northeast at 20 mph. These storms have a 3 to 5 inch per hour rainfall rate, which could lead to localize flooding. HAZARD...Two to three inch of rain possible. Wind may gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Localized flooding in low lying areas and ponding of water on roadways. Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Mount Airy... Ararat... Cana... Pine Ridge... Lambsburg... and Toast.
INSTRUCTION: If outdoors, consider seeking shelter inside a building. Locally heavy rain will quickly reduce visibility and result in ponding of water on roadways, standing water in low lying areas, and minor flooding of creeks, streams, and areas of poor drainage. Drivers are urged to slow down and use extra caution to avoid hydroplaning.
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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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