Weather Alert in Minnesota
Winter Weather Advisory issued February 24 at 2:56AM CST until February 24 at 3:00PM CST by NWS Duluth MN
AREAS AFFECTED: North St. Louis; Central St. Louis
DESCRIPTION: * WHAT...Snow. Additional snow accumulations between 1 and 3 inches. * WHERE...Central and North St. Louis County. This includes the Tribal Lands of the Bois Forte Band, Lake Vermilion and, Nett Lake areas. Other locations including Voyageurs National Park. This also includes the Boundary Waters western area. * WHEN...Until 3 PM CST this afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...The highest snow accumulations will be in far east-central and northern St. Louis County. While snowfall rates will be moderate to heavy at times during the late morning to early afternoon, snow consistency will not be as dense as last week's snow.
INSTRUCTION: Slow down and use caution while traveling. Call 511 or visit www.511mn.org for Minnesota road information.
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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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