Plot Description:

This plot displays an accumulated total of office issued watch, warning, advisories. These totals are not official and based on IEM processing of NWS text warning data. The totals are for individual warnings and not some combination of counties + warnings. The archive begin date varies depending on which phenomena you are interested in.

Generally, the archive starts in Fall 2005 for most types. Event counts do exist for Severe Thunderstorm, Tornado and Flash Flood warnings for dates back to 1986. Data quality prior to 2001 is not the greatest though.

If you want to use the "cold season" as the basis of a year, pick the "July 1" option below. The "year" label is then associated with the fall portion of the cold season (1 Jul 2021 - 30 Jun 2022 is 2021).

Updated 26 Jan 2023 When selecting to limit to a year to date period, a more exact algorithm is now used to accumulate warnings through the end of the current date in central timezone.

Autoplot 73 is very similiar to this plot, but allows for a user defined period to be selected.