Weather Alert in Illinois
Red Flag Warning issued February 27 at 12:28AM CST until February 27 at 6:00PM CST by NWS St Louis MO
AREAS AFFECTED: Adams; Brown; Pike; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain
DESCRIPTION: The National Weather Service in St Louis MO has issued a Red Flag Warning in effect from noon today to 6 PM CST this evening. * AFFECTED AREA...Portions of west central Illinois and central and northeast Missouri. * TIMING...From noon today to 6 PM CST this evening. * WINDS...West winds 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...Relative Humidity between 20 to 25 percent. * TEMPERATURES...In the upper 60s to low 70s. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended.
INSTRUCTION: Please advise the appropriate officials or fire crews in the field of this Red Flag Warning.
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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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