Weather Alert in Illinois
Flood Watch issued July 25 at 5:30PM CDT until July 26 at 7:00PM CDT by NWS Chicago IL
AREAS AFFECTED: Winnebago; Boone; McHenry; Lake; Ogle; Lee; De Kalb; La Salle
DESCRIPTION: * WHAT...Flash flooding caused by excessive rainfall due to repeated rounds of torrential rain-producing thunderstorms is possible. * WHERE...Boone, De Kalb, La Salle, Lee, Ogle, Winnebago, Lake IL and McHenry counties in Illinois. * WHEN...Through Saturday evening. * IMPACTS...Creeks and streams may rise out of their banks. In addition, roads and streets may flood, especially in areas where storm drains are clogged with debris. Finally, flooding of basements may occur if thunderstorms train over urban areas. * ADDITIONAL DETAILS... - Over the next 36 hours, several rounds of torrential rain- producing thunderstorms are possible in the watch area including over areas that experienced several inches of rain in the past few days. The tropical-like airmass will support rain rates in excess of 2 inches per hour in the strongest thunderstorms, leading to a threat for flash flooding. - http://www.weather.gov/safety/flood
INSTRUCTION: Monitor the latest forecasts and be prepared to take quick action should flooding develop.
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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