Flash Flood Warnings in Louisiana, 2010

By month

24 of 51 flash flood warnings covering Louisiana in 2010 had a flash flood report inside them; 30 of 42 flash flood reports fell inside a warning, on average 87 minutes after it went out.

Louisiana, 2010

Each office's whole area, 2010

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

• Concordia Parish7
• Tensas Parish6
• Jefferson Parish6
• Lafourche Parish5
• Saint Charles Parish5
• Saint Tammany Parish5
• East Baton Rouge Parish4
• Richland Parish4
• St. Mary Parish4
• Iberia Parish4
• Saint Martin Parish4
• Pointe Coupee Parish4
• West Feliciana Parish4
• Madison Parish3
• Calcasieu Parish3
• Orleans Parish3
• Catahoula Parish3
• West Baton Rouge Parish3
• Avoyelles Parish3
• Saint Landry Parish3
• Plaquemines Parish2
• Franklin Parish2
• East Feliciana Parish2
• Morehouse Parish2
• Vermilion Parish2
• Iberville Parish2
• Washington Parish2
• Tangipahoa Parish2
• Livingston Parish2
• Evangeline Parish2
• Rapides Parish2
• Claiborne Parish1
• Union Parish1
• Saint Bernard Parish1
• Saint Helena Parish1
• Ouachita Parish1
• Terrebonne Parish1
• Saint John the Baptist Parish1
• Lafayette Parish1

1. August 18, 201011flash flood warnings
2. August 13, 20104flash flood warnings
3. January 21, 20103flash flood warnings
4. May 29, 20103flash flood warnings
5. June 4, 20103flash flood warnings
6. May 19, 20102flash flood warnings
7. June 9, 20102flash flood warnings
8. July 6, 20102flash flood warnings
9. July 25, 20102flash flood warnings
10. August 29, 20102flash flood warnings
11. January 29, 20101flash flood warnings
12. April 23, 20101flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20092011

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.