Weather Alert in Minnesota
Severe Thunderstorm Warning issued August 11 at 9:01PM CDT until August 11 at 9:45PM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Stevens, MN
DESCRIPTION: SVRMPX The National Weather Service in the Twin Cities has issued a * Severe Thunderstorm Warning for... Northern Stevens County in west central Minnesota... * Until 945 PM CDT. * At 901 PM CDT, a severe thunderstorm was located near Donnelly, or 13 miles northwest of Morris, moving east at 30 mph. HAZARD...Ping pong ball size hail. SOURCE...Trained spotters reported. IMPACT...People and animals outdoors will be injured. Expect damage to roofs, siding, windows, and vehicles. * This severe thunderstorm will be near... Donnelly around 910 PM CDT. Morris around 925 PM CDT. Other locations impacted by the severe thunderstorm include Fish Lake.
INSTRUCTION: Seek shelter inside a well-built structure and stay away from windows. This storm has produced large hail.
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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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