Weather Alert in North Carolina

Recent Locations: Browns Summit, NC Lockridge, IA Deming, NM

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 Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle