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 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
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