Weather Alert in Illinois
Flood Warning issued April 4 at 11:38AM CDT until April 7 at 1:00AM CDT by NWS Chicago IL
AREAS AFFECTED: La Salle, IL
DESCRIPTION: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at Ottawa affecting La Salle County. Illinois River at La Salle affecting La Salle, Bureau and Putnam Counties. For the Illinois River (Upper)...including Ottawa, La Salle...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Illinois River from Heritage Harbor east of Ottawa downstream to Starved Rock Lock and Dam, including the Ottawa gauge. * WHEN...Until early Tuesday morning. * IMPACTS...At 464.0 feet, Backwater causes the Fox River to reach bankfull near St. Elizabeth Medical Center in Ottawa. * ADDITIONAL DETAILS... - At 10:30 AM CDT Saturday the stage was 463.0 feet. - Forecast...The river is expected to rise to a crest of 464.5 feet early tomorrow afternoon. It will then fall below flood stage Monday evening. - Flood stage is 463.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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