Weather Alert in Missouri
Flood Advisory issued June 30 at 7:47PM CDT until June 30 at 11:45PM CDT by NWS St Louis MO
AREAS AFFECTED: St. Louis, MO
DESCRIPTION: * WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...A portion of east central Missouri, including the following county, central Saint Louis. * WHEN...Until 1145 PM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 746 PM CDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Between 1 and 1.5 inches of rain have fallen. - The storm causing the heavy rainfall is barely moving, and it will continue to rain over these areas until it dissipates. - Some locations that will experience flooding include... Chesterfield, University City, Maryland Heights, Hazelwood, Ferguson, Creve Coeur, Overland, St. Ann, Bridgeton, Town and Country, Berkeley, Ladue, Olivette, St. John, Woodson Terrace, Frontenac, Bel-Ridge, Kinloch, Lambert-St. Louis International Airport and Breckenridge Hills.
INSTRUCTION: Be aware of your surroundings and do not drive on flooded roads.
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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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