Weather Alert in Minnesota
Air Quality Alert issued July 11 at 2:57PM CDT by NWS Sioux Falls SD
AREAS AFFECTED: Lincoln; Lyon; Murray; Cottonwood; Nobles; Jackson; Pipestone; Rock
DESCRIPTION: * WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Orange or Unhealthy for Sensitive Groups category. * WHERE...Southwest Minnesota. * WHEN...Until 9 AM CDT Monday. * IMPACTS...Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, may experience health effects. * ADDITIONAL DETAILS...Heavy ground-level smoke from wildfires in central Canada moved into northwest Minnesota early Friday morning behind a cold front. This first band of smoke is currently impacting northern Minnesota as it moves east during the day Friday. Air quality will worsen across northeast Minnesota Friday evening as smoke arrives over the region. A second round of smoke will move into northwest Minnesota late Friday evening. This smoke will be more widespread as it moves southeast overnight, and by Saturday afternoon the entire state may be impacted. The heaviest smoke on Saturday will be across the northern half of the state. Air quality will begin to improve across western Minnesota Sunday morning as cleaner air moves in from the west. By Sunday evening, the smoke should be gone from most of the state. Another round of smoke is possible across far northern Minnesota Sunday night.
INSTRUCTION: Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, should limit prolonged or heavy exertion. Reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and use of residential wood burning devices. Reduce vehicle trips and vehicle idling as much as possible. Keep windows closed overnight to prevent smoke from getting indoors.
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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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