Flash Flood Warnings in Mississippi, 2009

By month

150 of 303 flash flood warnings covering Mississippi in 2009 had a flash flood report inside them; 208 of 233 flash flood reports fell inside a warning, on average 97 minutes after it went out.

Mississippi, 2009

Each office's whole area, 2009

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.

• Coahoma County28
• Tunica County27
• Carroll County26
• Tallahatchie County24
• Panola County23
• Quitman County23
• Yalobusha County22
• Montgomery County22
• Leflore County21
• Lafayette County21
• Choctaw County19
• Holmes County19
• Hinds County18
• Sunflower County18
• DeSoto County18
• Tate County18
• Tishomingo County18
• Union County18
• Alcorn County17
• Grenada County16
• Yazoo County16
• Prentiss County16
• Tippah County16
• Perry County15
• Pontotoc County15
• Washington County15
• Marshall County15
• Oktibbeha County14
• Madison County14
• Calhoun County14
• Greene County14
• Itawamba County14
• Lee County14
• Bolivar County13
• Forrest County13
• Wayne County13
• Humphreys County13
• Attala County12
• Chickasaw County12
• Lamar County12

1. September 18, 200919flash flood warnings
2. March 28, 200914flash flood warnings
3. May 6, 200914flash flood warnings
4. September 23, 200913flash flood warnings
5. February 27, 200911flash flood warnings
6. April 13, 200910flash flood warnings
7. September 15, 200910flash flood warnings
8. September 17, 200910flash flood warnings
9. July 29, 20099flash flood warnings
10. May 16, 20098flash flood warnings
11. December 14, 20098flash flood warnings
12. May 4, 20097flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20082010

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.