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 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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