Weather Alert in Iowa
Special Weather Statement issued August 11 at 4:17AM CDT by NWS La Crosse WI
AREAS AFFECTED: Howard; Winneshiek; Allamakee; Floyd; Chickasaw; Fayette; Clayton; Winona; Houston; Jackson; La Crosse; Monroe; Juneau; Adams; Vernon; Crawford; Richland; Grant
DESCRIPTION: Expect to encounter fog through 8 am across western and central Wisconsin into northeast Iowa. Some visibilities were below one- quarter of a mile. Locally, there could be near zero visibility in dense fog. If traveling, be sure to slow down in the fog. Dont make risky vehicle maneuvers like turning around in the highway when visibility is very low. Oncoming traffic will have little time to stop.
INSTRUCTION: N/A
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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
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