Weather Alert in Minnesota
Air Quality Alert issued June 11 at 2:49PM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Douglas; Todd; Morrison; Mille Lacs; Kanabec; Stevens; Pope; Stearns; Benton; Sherburne; Isanti; Chisago; 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; Goodhue; Watonwan; Blue Earth; Waseca; Steele; Martin; Faribault; Freeborn
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...Central and southern Minnesota. * WHEN...Until 11 PM CDT Thursday. * IMPACTS...Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, may experience health effects. * ADDITIONAL DETAILS...Smoke from wildfires in northwest Canada has moved into central and southern Minnesota behind a cold front. This smoke is beginning to mix to the ground and fine particle levels have climbed into the Unhealthy for Sensitive Groups AQI category across central and southern Minnesota. This smoke will linger along a frontal boundary that will stall over the southern part of the state. Rainfall is expected across this same region through Thursday and this may help reduce smoke levels in some areas. However, it's possible this smoke may linger through the end of the day on Thursday.
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 Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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