Weather Alert in South Dakota
Flood Warning issued August 23 at 7:20AM CDT until August 25 at 10:00PM CDT by NWS Aberdeen SD
AREAS AFFECTED: Hamlin, SD
DESCRIPTION: ...Forecast flooding changed from Minor to Moderate severity for the following rivers in South Dakota... Big Sioux River Near Castlewood affecting Hamlin County. .For sites with a river forecast, the forecast includes precipitation through the next 24 hours. Any future precipitation could affect the forecasts. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Big Sioux River near Castlewood. * WHEN...Until late Monday evening. * IMPACTS...At 11.0 feet, Significant amounts of pasture and other agricultural lands will be flooded. * ADDITIONAL DETAILS... - At 6:45 AM CDT Saturday the stage was 11.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 6:45 AM CDT Saturday was 11.0 feet. - Forecast...The river is expected to rise to a crest of 11.1 feet this afternoon. It will then fall below flood stage Monday afternoon. - Flood stage is 9.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/abr. The next statement will be issued by Sunday afternoon at 330 PM CDT.
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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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