The NWS has the entire state under a Wind Chill Advisory this morning. As measured by the number of unique events by a forecast county/zone, this advisory is the sixth most commonly issued alert by the NWS Des Moines. The featured table presents the relative frequency of an alert as issued by NWS Des Moines against the most common alert, the Severe Thunderstorm Warning. The relative percent indicates in bulk that a severe thunderstorm event is twice as common as a wind chill advisory. The Wind Chill Warning has colder thresholds for alerting than the advisory and appropriately appears at much lower frequencies for the chart.

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