Weather Alert in Illinois
Hydrologic Outlook issued April 4 at 11:53AM CDT by NWS Lincoln IL
AREAS AFFECTED: Piatt, IL
DESCRIPTION: ESFILX This hydrologic outlook includes the following river in Illinois: Sangamon River... The following river information is based on future predicted rainfall. The exact amount, intensity, timing, and location of the rain that will occur is still uncertain. These outlook stages are provided to show what may be expected if the forecast precipitation occurs. Once there is more certainty about the river forecasts, a flood warning or statement will be issued if the threat materializes.
INSTRUCTION: N/A
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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
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