Weather Alert in Illinois
Special Weather Statement issued May 16 at 9:31AM CDT by NWS Chicago IL
AREAS AFFECTED: Winnebago; Boone; McHenry; Lake; Ogle; DuPage; Kankakee; Livingston; Iroquois; Ford; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will
DESCRIPTION: Strong south to southwesterly winds gusting to 45 mph along with relative humidities to around 25 percent will result in an elevated fire danger through early evening, particularly for locations where little to no rain occurred on Thursday. Any fires that start in these conditions will have an increased risk of spreading quickly. Avoid or delay any outdoor burning, use extra caution with any farm machinery, and fully extinguish cigarettes or matches before disposing of them properly.
INSTRUCTION: N/A
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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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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