What does heat index mean? Understanding 'feels like' temps, humidity in OKC

The heat index explains 'feels like' temperatures by combining humidity and air temperature, specifically analyzed for OKC. Meanwhile, southern New England experienced a temperature surge, with readings reaching the mid 80s to approximately 90 degrees in areas away from the south coast. These conditions highlight the impact of humidity on perceived heat, as temperatures stepped up yesterday, bringing significant warmth and moisture to the region as reported in the provided meteorological sources.