Weather Alert in Minnesota
Air Quality Alert issued July 23 at 3:07PM 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...From 12 AM CDT Thursday until 11 PM CDT Friday. * IMPACTS...Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, may experience health effects. * ADDITIONAL DETAILS...A band of heavy smoke from wildfires in Saskatchewan and Manitoba is moving south across northwest Minnesota on Wednesday. The smoke will remain over the northwest part of the state through the end of Wednesday, but by Thursday morning the smoke will reach southwest MN. Smoke will also move into the northeast and central portions of the state Thursday morning, and by Thursday afternoon smoke will reach east central and south central MN. Some uncertainty still remains regarding how far south the ground-level smoke will reach by Friday morning, when winds are expected to become southerly and push the smoke back to the north. Air quality should improve gradually from south to north beginning Friday afternoon, with improvement in fine particle levels below the alert threshold expected by the end of Friday.
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 Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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