Weather Alert in Iowa
Flood Watch issued July 19 at 2:48PM CDT until July 20 at 10:00AM CDT by NWS Des Moines IA
AREAS AFFECTED: 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; Clarke; Lucas; Monroe; Wapello; Davis
DESCRIPTION: Thunderstorms are expected across the area tonight with the potential to produce heavy to very heavy rainfall. * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of central, northeast, south central, southeast, southwest, and west central Iowa, including the following counties, in central Iowa, Boone, Dallas, Grundy, Hamilton, Hardin, Jasper, Marshall, Polk, Poweshiek, Story, Tama and Webster. In northeast Iowa, Black Hawk. In south central Iowa, Clarke, Lucas, Madison, Mahaska, Marion, Monroe and Warren. In southeast Iowa, Davis and Wapello. In southwest Iowa, Adair and Cass. In west central Iowa, Audubon, Calhoun, Carroll, Crawford, Greene, Guthrie and Sac. * WHEN...From 7 PM CDT this evening through Sunday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Significant ponding may also occur. * ADDITIONAL DETAILS... - Thunderstorms producing heavy to very heavy rainfall are possible tonight. Intense rainfall rates are likely with any storms producing 1 to 2 inches or rainfall over a short time period. Total rainfall amounts of 2 to 5 inches may occur in some areas with the potential to exceed 5 inches in a few areas.
INSTRUCTION: For the latest waterway observations and forecasts refer to weather.gov/desmoines/water.
Want more detail? Get the Complete 7 Day and Night Detailed Forecast!
Current U.S. National Radar--Current
The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).
National Weather Forecast--Current
The Current National Weather Forecast and National Weather Map are shown below.
National Weather Forecast for Tomorrow
Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.
North America Water Vapor (Moisture)
This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.
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
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
Current conditions powered by WeatherAPI.com
