Alert archive / Hazardous Seas Watches / 2021

Hazardous Seas Watches in the United States, March 2021

4 hazardous seas watches in March 2021. Each alert counts once, however many counties it covered. The archive of hazardous seas watches reaches back to 2005.

Hazardous Seas Watches by state

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

Hazardous Seas Watches: 4
Busiest day: March 12, 20212 hazardous seas watches

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 now The tornado archive The radar archive 2020 2022

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.