Weather Alert in Montana
Air Quality Alert issued September 6 at 8:39AM MDT by NWS Great Falls MT
AREAS AFFECTED: Beaverhead, MT; Deer Lodge, MT; Granite, MT; Lincoln, MT; Mineral, MT; Ravalli, MT; Sanders, MT
DESCRIPTION: AQAMT The Montana Department of Environmental Quality has issued an air quality alert for Beaverhead, Deer Lodge, Granite, Lincoln, Mineral, Ravalli, Sanders counties in effect until 9AM on 09/07/2025 An Air Quality Alert means that particulates have been trending upwards and that an exceedance of the 24 hour National Ambient Air Quality Standard (NAAQS) has occurred or may occur in the near future. An Air Quality Alert means that particulates have been trending upwards and that an exceedence of the 24 hour National Ambient Air Quality Standard (NAAQS) has occurred or may occur in the near future. As of 7AM on 09/06/2025, particulate levels in Hamilton and Libby are Unhealthy for Sensitive Groups. As of 7AM on 09/06/2025, particulate levels in Billings, Butte, Columbia Falls, Dillon, Frenchtown, Helena, Lewistown, Missoula, Seeley Lake, Thompson Falls and West Yellowstone are Moderate. When air quality is Unhealthy...State and local health officials recommend that people with respiratory or heart disease...the elderly...and children should avoid prolonged exertion; everyone else should limit prolonged exertion. For more information visit the Montana Department of Environmental Quality at www.todaysair.mt.gov
INSTRUCTION: N/A
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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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