Weather Alert in Iowa
Air Quality Alert issued August 1 at 12:38PM CDT by NWS Des Moines IA
AREAS AFFECTED: Lyon; Osceola; Dickinson; Emmet; Kossuth; Winnebago; Worth; Mitchell; Howard; Winneshiek; Allamakee; Sioux; O'Brien; Clay; Palo Alto; Hancock; Cerro Gordo; Floyd; Chickasaw; Plymouth; Cherokee; Buena Vista; Pocahontas; Humboldt; Wright; Franklin; Butler; Bremer; Fayette; Clayton; Woodbury; Ida; Sac; Calhoun; Webster; Hamilton; Hardin; Grundy; Black Hawk; Buchanan; Delaware; Dubuque; Monona; Crawford; Carroll; Greene; Boone; Story; Marshall; Tama; Benton; Linn; Jones; Jackson; Harrison; Shelby; Audubon; Guthrie; Dallas; Polk; Jasper; Poweshiek; Iowa; Johnson; Cedar; Clinton; Muscatine; Scott; Pottawattamie; Cass; Adair; Madison; Warren; Marion; Mahaska; Keokuk; Washington; Louisa; Mills; Montgomery; Adams; Union; Clarke; Lucas; Monroe; Wapello; Jefferson; Henry; Des Moines; Fremont; Page; Taylor; Ringgold; Decatur; Wayne; Appanoose; Davis; Van Buren; Lee
DESCRIPTION: The Iowa DNR is extending the Air Quality Alert for all of Iowa through 8 AM Sunday. Moderate to heavy smoke is expected to continue impacting most of Iowa at levels considered unhealthy for sensitive groups or even unhealthy for healthy individuals. Sensitive groups include people with respiratory illness or heart disease, children, teenagers, the elderly, and outdoor workers. The DNR recommends that people avoid long or intense outdoor activities and take frequent breaks until the air quality improves.
INSTRUCTION: N/A
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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