Weather Alert in North Carolina

Recent Locations: Vacherie, LA Boring, OR Battleboro, NC

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 Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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