Weather Alerts for Iowa
1. Red Flag Warning for: Buchanan; Delaware; Dubuque; Benton; Linn; Jones; Jackson; Iowa; Johnson; Cedar; Clinton; Muscatine; Scott; Keokuk; Washington; Louisa; Jefferson; Henry; Des Moines; Van Buren; Lee; Jo Daviess; Stephenson; Carroll; Whiteside; Rock Island; Henry; Bureau; Putnam; Mercer; Henderson; Warren
2. Red Flag Warning for: Emmet; Kossuth; Winnebago; Worth; Palo Alto; Hancock; Cerro Gordo; Pocahontas; Humboldt; Wright; Franklin; Butler; Bremer; Sac; Calhoun; Webster; Hamilton; Hardin; Grundy; Black Hawk; Crawford; Carroll; Greene; Boone; Story; Marshall; Tama; Audubon; Guthrie; Dallas; Polk; Jasper; Poweshiek; Cass; Adair; Madison; Warren; Marion; Mahaska; Adams; Union; Clarke; Lucas; Monroe; Wapello; Taylor; Ringgold; Decatur; Wayne; Appanoose; Davis
3. Red Flag Warning for: Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Plymouth; Cherokee; Buena Vista; Woodbury; Ida; Nobles; Jackson; Rock; Dixon; Dakota; Gregory; Brule; Aurora; Davison; Hanson; McCook; Minnehaha; Charles Mix; Douglas; Hutchinson; Turner; Lincoln; Bon Homme; Yankton; Clay; Union
4. Red Flag Warning for: Mitchell; Howard; Winneshiek; Allamakee; Floyd; Chickasaw; Fayette; Clayton
5. Red Flag Warning for: Monona; Harrison; Shelby; Pottawattamie; Montgomery; Cedar; Thurston; Burt; Washington
6. Wind Advisory for: Buchanan; Delaware; Dubuque; Benton; Linn; Jones; Jackson; Jo Daviess; Stephenson; Carroll
7. Wind Advisory for: Emmet; Kossuth; Palo Alto; Pocahontas; Sac; Calhoun; Crawford
8. Wind Advisory for: Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Cherokee; Buena Vista; Ida; Lincoln; Lyon; Murray; Cottonwood; Nobles; Jackson; Pipestone; Rock
9. Wind Advisory for: Mitchell; Howard; Winneshiek; Allamakee; Floyd; Chickasaw; Fayette; Clayton; Dodge; Olmsted; Mower; Fillmore
10. Wind Advisory for: Plymouth; Woodbury; Dixon; Dakota; Beadle; Kingsbury; Sanborn; Miner; Davison; Hanson; McCook; Hutchinson; Turner; Bon Homme; Yankton; Clay; Union
11. Wind Advisory for: Winnebago; Worth; Hancock; Cerro Gordo; Humboldt; Wright; Franklin; Butler; Bremer; Webster; Hamilton; Hardin; Grundy; Black Hawk; Carroll; Greene; Boone; Story; Marshall; Tama
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North America Water Vapor (Moisture)
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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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