Alert archive / Winter Storm Warnings / 2017
Winter Storm Warnings in the United States, September 2017
9 winter storm warnings in September 2017. Each alert counts once, however many counties it covered. The archive of winter storm warnings reaches back to 2005.
Winter Storm Warnings by state
Each state shaded by its count. Tap a state for its own archive.
- Winter Storm Warnings
- 9
- Busiest day
- September 14, 20174 winter storm 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.
- California75
- Wyoming63
- Alaska56
- Montana56
- Colorado55
- Washington48
- Oregon43
- Idaho43
- Michigan33
- New York28
- Nevada24
- Maine24
- Nebraska21
- Minnesota20
- Utah19
- Wisconsin15
- New Mexico15
- Connecticut15
- South Dakota14
- Pennsylvania14
- Vermont14
- Maryland13
- North Carolina12
- Massachusetts12
- Iowa10
- New Hampshire10
- Virginia8
- Arizona8
- West Virginia8
- Mississippi7
- Texas7
- Indiana7
- New Jersey7
- Hawaii6
- North Dakota6
- Rhode Island6
- Georgia5
- Alabama4
- Delaware4
- Oklahoma4
Nearby
Alerts in force nowThe tornado archiveThe radar archive20162018
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.