Weather Alert in Minnesota
Air Quality Alert issued May 13 at 2:27PM CDT by NWS Duluth MN
AREAS AFFECTED: North St. Louis; Northern Cook/Northern Lake; Central St. Louis
DESCRIPTION: * WHAT...The Minnesota Pollution Control Agency has extended the 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...Northeast Minnesota. The areas most likely to experience smoke impacts include Brimson, Isabella, Babbitt, Ely, and portions of the Boundary Waters Canoe Area Wilderness. * WHEN...Until 4 PM CDT Wednesday. * 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 pair of large wildfires - the Camp House fire and Jenkins Creek fire - remain uncontained in northeastern Minnesota. The fires are located near Birmson, or approximately 25 miles north-northwest of Two Harbors. High temperatures and low dewpoints will continue to create an environment favorable for the growth of these wildfires as well as any other fires that may form. Southerly winds will gradually turn southeasterly and will transport smoke northward into northern St Louis and Lake counties.
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. Follow all safety instructions and evacuation orders from local emergency management officials. 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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