Weather Alert in Minnesota
Dense Fog Advisory issued September 11 at 1:26PM CDT until September 12 at 10:00AM CDT by NWS Duluth MN
AREAS AFFECTED: Southern Lake/North Shore; Southern Cook/North Shore; Carlton/South St. Louis; Douglas
DESCRIPTION: * WHAT...Visibility less around one quarter mile in dense fog. * WHERE...In Minnesota, Carlton, South St. Louis, Southern Cook and Southern Lake Counties. In Wisconsin, Douglas County. This includes the Tribal Lands of the Grand Portage Reservation and the Fond du Lac Band. * WHEN...From 7 PM this evening to 10 AM CDT Friday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...In Douglas County, the most widespread dense fog is expected in the northern areas of the county.
INSTRUCTION: If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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