Weather Alert in Illinois
Severe Thunderstorm Warning issued April 19 at 2:39AM CDT until April 19 at 3:00AM CDT by NWS St Louis MO
AREAS AFFECTED: Fayette, IL; Marion, IL
DESCRIPTION: At 239 AM CDT, severe thunderstorms were located along a line from over Farina to near Helm, or along a line from 15 miles northeast of Salem to 12 miles east of Salem, moving east at 70 mph. HAZARD...70 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. Locations impacted include... Centralia, Salem, Sandoval, Wamac, Central City, Odin, Kinmundy, Patoka, Farina, Omega, Stephen Forbes Station, Fairman, Helm, Tonti, La Clede, Iuka, Junction City, St. Peter, Alma and Kell. This includes Interstate 57 in Illinois between exits 109 and 135.
INSTRUCTION: Anyone outdoors should move to shelter inside a well-built structure and stay away from windows. These storms are capable of producing widespread damaging winds. Tornadoes can develop quickly from severe thunderstorms. Seek shelter immediately in an interior room on the lowest floor of a well-built structure.
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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
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
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