Weather Alert in Iowa
Special Weather Statement issued February 16 at 3:22AM CST by NWS Quad Cities IA IL
AREAS AFFECTED: Des Moines; Lee; Henry; Bureau; Putnam; Mercer; Henderson; Warren; Hancock; McDonough; Clark
DESCRIPTION: Patchy dense fog, reducing visibility to around a quarter of a mile or less, will be found across the area mainly from along the Mississippi River between Keokuk to Burlington on eastward to around Monmouth, Kewanee, Sheffield and Princeton. If driving be prepared for some travel impacts for the early morning commute. Visibility could change rapidly over short distances. When encountering fog reduce your speed, use low beam headlights, and also increase your following distance.
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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