Alert archive / Special Marine Warnings / 2021

Special Marine Warnings in the United States, May 2021

529 special marine warnings in May 2021. Each alert counts once, however many counties it covered. The archive of special marine warnings reaches back to 1986.

Special Marine Warnings by state

Each state shaded by its count. Tap a state for its own archive.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Special Marine Warnings
529
Busiest day
May 12, 202150 special marine warnings

Over time

By day

Days in UTC, the clock the archive keeps.

By state

Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.

Nearby

Alerts in force nowThe tornado archiveThe radar archive20202022

Sources

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. Rebuilt daily.