Weather Alert in Iowa
Flood Warning issued July 31 at 5:02AM CDT until August 3 at 3:00AM CDT by NWS Des Moines IA
AREAS AFFECTED: Marion, IA; Polk, IA; Warren, IA
DESCRIPTION: ...The Flood Warning continues for the following rivers in Iowa... Des Moines River at Des Moines SE 6th St affecting Marion, Warren and Polk Counties. * WHAT...Minor flooding is forecast. * WHERE...The Des Moines River at Des Moines SE 6th St, or from below the Center Street dam to Runnells. * WHEN...From this morning to early Sunday morning. * IMPACTS...At 25.7 feet, Water surrounds the base of Simon Estes Amphitheater. * ADDITIONAL DETAILS... - At 4:45 AM CDT Thursday the stage was 23.5 feet. - Forecast...The river is expected to rise above flood stage late this morning to a crest of 25.0 feet early tomorrow afternoon. It will then fall below flood stage late Saturday evening. - Flood stage is 24.0 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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