There are two regions within the Southeast, (1) the west portion and (2) the east portion. How these regions are made and how we define the 14-day extreme precipitation periods can be found here.

Key information:

  • The Southeast experienced the most precipitation periods with 63 periods in the west region and 71 periods in the east region.
  • Periods have occurred throughout the entire year, with no seasonal dependence.
  • The most common storm report during Southeast precipitation periods are Thunderstorm Wind, Flash Flood and Hail.

When do Southeast Extreme Periods occur?

Seen to the left, 14-Day periods within both Southeast regions are counted, based on month, from 1915 to 2018. The Southeast experiences 14-day extreme precipitation periods throughout the year, with no distinct wet season.

What are typical storm reports of Southeast Extreme Periods?

Using NCEI storm reports typical impacts of our 14-day extreme periods, past 1996, can be estimated. Beginning in 1996, 48 event types were recorded into the storm events database. Every report was recorded based on the county of occurrence by a National Weather Service forecast office (WFO) and then passed onto NCEI. Therefore, reports within 14-day extreme periods from 1996-2018 within Arkansas, Louisiana, Tennessee, Mississippi, Alabama, Georgia, North and South Carolina, and Florida are counted as Southeast 14-day extreme periods reports. Definitions of all storm reports can be found within the NWSI, Appendix A.

The average number of storm reports during extreme periods, within both regions in the Southeast, from 1996 to 2018 are seen to the right. “Thunderstorm Wind”, average of 154, “Flash Flood”, average of 89, and “Hail”, average of 60, are the most frequent reports seen during periods. The report “Tropical Storm” indicates the Southeast experiences some tropical storm activity within the extreme periods.

Point of contact: Melanie Schroers,