One of the most popular and seemingly internet unique datasets curated by the IEM is an archive of National Weather Service Watch, Warnings, and Advisories. This archive became tenable with the implementation of VTEC within the raw text products during the mid to late 2000s. So with about a 20 year archive of data, climatologies are possible! The featured chart is from a newly added "Autoplot" that computes the monthly average number of NWS Warnings/Advisories by month for Story County (Ames, IA). These alerts are grouped into general categories. Without getting too far off in the weeds here, the NWS issues some of these products for forecast zones and some for counties. Within Iowa, these are the same geographic regions, but this is not the case for most states. So to get reliable stats, the chart combines the "county" and "forecast zone" that covers Story County. The purpose of the chart is to highlight the seasonality of various alert categories and also provide a sense of frequency. Note that this chart does not include watches, but only warnings and advisories. June is clearly the most frequent month for Severe Thunderstorm Warnings, but May is for Tornado Warnings. January is the overall "winner" for most events on average with September having the least. You can generate this chart by NWS forecast office, state, and even FEMA region. Feedback is certainly welcome!