Weather Alert in North Carolina
Special Weather Statement issued August 12 at 2:21PM EDT by NWS Morristown TN
AREAS AFFECTED: Cherokee; Clay; Scott; Campbell; Claiborne; Hancock; Hawkins; Sullivan; Johnson; Morgan; Anderson; Union; Grainger; Hamblen; Northwest Cocke; Cocke Smoky Mountains; Northwest Greene; Southeast Greene; Washington; Unicoi; Northwest Carter; Southeast Carter; Roane; Loudon; Knox; Jefferson; NW Blount; Blount Smoky Mountains; North Sevier; Sevier Smoky Mountains; Sequatchie; Bledsoe; Rhea; Meigs; McMinn; Northwest Monroe; Southeast Monroe; Marion; Hamilton; Bradley; West Polk; East Polk; Lee; Wise; Scott; Russell; Washington
DESCRIPTION: A stream of tropical moisture will move north from the Gulf into the Tennessee valley and southern Appalachians through Wednesday. Periods of showers and embedded thunderstorms can be expected. Due to the abundant moisture these storms will be capable of producing excessive rainfall rates. If the storms move across the same locations, localized flash flooding is possible. Persons living near streams need stay alert for the potential of rapid water rise and flash flooding. Localized flooding of low lying areas and roadway flooding are possible. Please stay tuned to your NOAA weather radio and favorite radio and TV stations for the latest forecast and possible flash flood warnings or advisories in your area.
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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