Weather Alert in Iowa
Flood Warning issued July 31 at 5:01AM CDT until August 3 at 1:00PM CDT by NWS Des Moines IA
AREAS AFFECTED: Polk, IA
DESCRIPTION: ...The Flood Warning continues for the following rivers in Iowa... Raccoon River at Des Moines Fleur Dr affecting Polk County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...The Raccoon River at Des Moines Fleur Dr, or from Walnut Creek to the Des Moines River. * WHEN...Until early Sunday afternoon. * IMPACTS...At 13.5 feet, Water affects the low areas of Water Works Park. * ADDITIONAL DETAILS... - At 4:47 AM CDT Thursday the stage was 12.5 feet. - Forecast...The river is expected to rise to a crest of 13.5 feet tomorrow morning. It will then fall below flood stage Sunday morning. - Flood stage is 12.0 feet.
INSTRUCTION: For the latest waterway observations and forecasts refer to weather.gov/desmoines/water. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. River forecasts include observed precipitation plus forecast precipitation over the next 24 hours.
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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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