Weather Alert in Iowa
Flood Watch issued July 11 at 12:29PM CDT until July 12 at 1:00AM CDT by NWS Des Moines IA
AREAS AFFECTED: Grundy; Black Hawk; Marshall; Tama; Dallas; Polk; Jasper; Poweshiek; Madison; Warren; Marion; Mahaska
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues to be possible. Rainfall amounts between 2 and 3 inches, with locally higher amounts are expected this morning. Additional heavy rainfall is expected this afternoon and evening. * WHERE...Portions of central, northeast, and south central Iowa, including the following counties, in central Iowa, Dallas, Grundy, Jasper, Marshall, Polk, Poweshiek and Tama. In northeast Iowa, Black Hawk. In south central Iowa, Madison, Mahaska, Marion and Warren. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
INSTRUCTION: For the latest waterway observations and forecasts refer to weather.gov/desmoines/water.
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North America Water Vapor (Moisture)
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
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
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