Weather Alert in Minnesota
Air Quality Alert issued May 12 at 4:53PM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Douglas; Todd; Morrison; Mille Lacs; Kanabec; Stevens; Pope; Stearns; Benton; Sherburne; Isanti; Lac Qui Parle; Swift; Chippewa; Kandiyohi; Meeker; Wright; Hennepin; Anoka; Ramsey; Washington; Yellow Medicine; Renville; McLeod; Sibley; Carver; Scott; Dakota; Redwood; Brown; Nicollet; Le Sueur; Rice; Watonwan; Blue Earth; Waseca; Steele; Martin; Faribault; Freeborn
DESCRIPTION: * WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for ozone pollution. The Air Quality Index (AQI) is expected to reach the Orange or Unhealthy for Sensitive Groups category. * WHERE...West central, east central, central, south central, southwest, north central, and northwest Minnesota. * WHEN...From noon CDT to 9 PM CDT Tuesday. * IMPACTS...Sensitive groups, such as people with lung disease (including asthma), heart disease, children and older adults, and people who are active outdoors, may experience health effects. * ADDITIONAL DETAILS...Ground-level ozone is expected to be high once again during the afternoon hours on Tuesday across roughly the western two-thirds of Minnesota, including the Twin Cities Metro. Mostly sunny skies, warm temperatures and low humidity will provide a favorable environment for two types of pollutants (volatile organic compounds and nitrogen oxides) to react with sunlight in the air to produce ground-level ozone. Ozone will remain elevated on Wednesday as sunny skies, warm temperatures and dry conditions persist.
INSTRUCTION: Sensitive groups, such as people with lung disease (including asthma), heart disease, children and older adults, and people who are active outdoors, should limit prolonged or heavy outdoor 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.
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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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