Strong east-southeasterly pressure gradient flow between a strong high pressure over the mid-Atlantic and a weak surface low in the northwestern Gulf led to several days of coastal flooding across southern Mississippi. Reports varied from each day, with the most impacts during high tide cycles.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LIX wrote it up.
Strong east-southeasterly pressure gradient flow between a strong high pressure over the mid-Atlantic and a weak surface low in the northwestern Gulf led to several days of coastal flooding across southern Mississippi. Reports varied from each day, with the most impacts during high tide cycles.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS New Orleans, LA wrote its last area forecast discussion before the first event at May 19, 10:07 AM CST, 1 hour 53 minutes earlier.
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</html>1 coastal flood. Local standard time, as filed.
By May 21st, 244 streets were impassable due to previous days high water from coatal flooding. The worst flooding was reported by 1800 LST May 20th with 2017 flooding streets, which was also at the time the local gauge reported the highest water levels.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Mississippi in 2021Every state in 2021This day in weather historyWarnings in Mississippi, May 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 960582.