Special Marine Warnings in the United States
110,136 special marine warnings since 1986. 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.
- Special Marine Warnings
- 110,136
- Busiest year
- 20236,158 special marine warnings
- Average year
- 4,079over 27 years on file
- Busiest day
- August 3, 2024106 special marine warnings
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- Florida35,535
- Louisiana12,534
- Virginia10,597
- Michigan6,694
- Texas6,068
- Alabama5,898
- North Carolina5,547
- New York4,709
- South Carolina2,880
- New Jersey2,775
- Ohio2,171
- Massachusetts2,128
- Wisconsin2,073
- California1,626
- Georgia1,592
- Hawaii1,483
- Illinois1,345
- Puerto Rico1,342
- Minnesota809
- Maine603
- Indiana446
- Oregon200
- Alaska127
- Washington76
- Guam69
- Pennsylvania61
- Northern Mariana Islands45
- New Hampshire8
- Mississippi2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
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.