Weather Alert in Louisiana

Recent Locations: Gramercy, LA  

Flood Watch issued July 16 at 3:38PM CDT until July 19 at 1:00AM CDT by NWS New Orleans LA

AREAS AFFECTED: Pointe Coupee; West Feliciana; East Feliciana; St. Helena; Washington; Iberville; West Baton Rouge; East Baton Rouge; Assumption; St. James; St. John The Baptist; Upper Lafourche; St. Charles; Upper St. Bernard; Upper Terrebonne; Lower Terrebonne; Lower Lafourche; Coastal Jefferson; Lower Plaquemines; Lower St. Bernard; Northern Tangipahoa; Southeast St. Tammany; Western Orleans; Eastern Orleans; Northern St. Tammany; Southwestern St. Tammany; Central Tangipahoa; Lower Tangipahoa; Northern Livingston; Southern Livingston; Western Ascension; Eastern Ascension; Upper Jefferson; Lower Jefferson; Upper Plaquemines; Central Plaquemines; Pearl River; Northern Hancock; Northern Harrison; Northern Jackson; Southern Hancock; Southern Harrison; Southern Jackson

DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southeast Louisiana, including the following parishes, Assumption, Central Plaquemines, Central Tangipahoa, Coastal Jefferson Parish, East Baton Rouge, East Feliciana, Eastern Ascension, Eastern Orleans, Iberville, Lower Jefferson, Lower Lafourche, Lower Plaquemines, Lower St. Bernard, Lower Tangipahoa, Lower Terrebonne, Northern Livingston, Northern St. Tammany, Northern Tangipahoa, Pointe Coupee, Southeast St. Tammany, Southern Livingston, Southwestern St. Tammany, St. Charles, St. Helena, St. James, St. John The Baptist, Upper Jefferson, Upper Lafourche, Upper Plaquemines, Upper St. Bernard, Upper Terrebonne, Washington, West Baton Rouge, West Feliciana, Western Ascension and Western Orleans and southern Mississippi, including the following areas, Northern Hancock, Northern Harrison, Northern Jackson, Pearl River, Southern Hancock, Southern Harrison and Southern Jackson. * WHEN...Through late Friday night. * 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. * ADDITIONAL DETAILS... - A tropical disturbance moving westward over the northern Gulf will produce periods of potentially heavy and training rainfall through Friday night. Rainfall totals of 3 to 6 inches are likely through Friday night, especially near and south of the Interstate 10 corridor with isolated totals up to 10 inches possible. - http://www.weather.gov/safety/flood

INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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

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

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