Weather Alert in Kentucky
Special Weather Statement issued September 6 at 11:25PM EDT by NWS Louisville KY
AREAS AFFECTED: Fayette; Jessamine; Clark; Marion; Boyle; Garrard; Madison; Green; Taylor; Casey; Lincoln; Allen; Barren; Monroe; Metcalfe; Adair; Russell; Cumberland; Clinton
DESCRIPTION: The combination of clearing skies, light winds, and lingering low-level moisture will result in valley fog developing and possibly becoming rather dense overnight. The most extensive fog will be found in the river valleys and over bodies of water. Visibilities may drop below a quarter of a mile in spots. Be sure to slow down and use low-beam headlights if you encounter fog.
INSTRUCTION: N/A
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - 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
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