The National Weather Service issues many different watch, warning, and advisory types to cover weather threats to life and property. These "headlines" are issued for counties or forecast zones or sometimes polygon areas. For the purposes of the featured chart, the most frequent 25 headline types are presented over the past four years for NWS Des Moines. The accounting for this presentation considers the number of counties lit up by each event. For example, a Fog Advisory covering 51 counties would count for 51 in this analysis. The Severe Thunderstorm Warning and Winter Weather Advisory are easily the top two headlines with the Fog Advisory third. You can generate this plot for other NWS Forecast Offices and year periods of your choice.

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