Research Article

The Performance of the National Weather Service Heat Warning System against Ground Observations and Satellite Imagery

Figure 3

Stations are presented by the number of false positive and negative instances in 2011 and 2012. The National Land Cover Dataset’s (NLCD) 2011 land cover classification scheme is included. A false negative means station conditions exceeded Heat Advisory Criteria with no such Advisory issued from NWS. A false positive is when Heat Advisory conditions at the station were not met despite NWS issuing an advisory.