Alert archive / Red Flag Warnings / 2021
Red Flag Warnings in the United States, May 2021
84 red flag warnings in May 2021. Each alert counts once, however many counties it covered. The archive of red flag warnings reaches back to 2005.
Red Flag Warnings by state
Each state shaded by its count. Tap a state for its own archive.
- Red Flag Warnings
- 84
- Busiest day
- May 1, 202122 red flag 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.
- Colorado146
- California117
- Texas107
- Kansas106
- Wyoming102
- Montana97
- New Mexico83
- Nebraska80
- Oregon75
- South Dakota59
- Idaho53
- Utah52
- Nevada50
- Arizona50
- North Dakota44
- Oklahoma41
- Minnesota30
- Washington28
- Iowa19
- Alaska12
- Missouri12
- Guam12
- North Carolina10
- Florida10
- Michigan8
- Virginia8
- Puerto Rico8
- Connecticut7
- South Carolina6
- Massachusetts6
- Illinois5
- Wisconsin5
- Hawaii5
- Georgia4
- Maryland4
- New Hampshire3
- Rhode Island3
- Pennsylvania2
- Maine2
- New Jersey2
4 more states
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.