Plot Description:

This plot presents a frequency of having either a heat index or wind chill advisory/warning active for a given computed feels like temperature. The major caveat with this plot is that it does not address the duration requirement that these alerts carry with them. For example, instantaneously dipping to a wind chill of -20 does not necessarily necessitate a wind chill advisory be issued. Another tunable knob to this application is to only consider 'additive' cases. That being when the wind chill is colder than the air temperature and when the heat index is higher than the air temperature. In the case of wind chill, a calm wind can lead to a nebulous wind chill. Similiarly, a low humidity to what the computed heat index is.

For the winter season of 2024-2025, the National Weather Service changed to issue Extreme Cold Warning and Cold Weather Advisory instead of Wind Chill Advisories/Warnings.

For the 2025 summer season, the National Weather Service changed to issue Extreme Heat Warning instead of an Excessive Heat Warning.

The plot shows the NWS headline frequency for the forecast zone that the automated weather station resides in.