Temperatures and heat indices overachieved today. The hottest regular temperature I could find was 90 degrees in Newark. The highest heat indices occurred outside of the Philadelphia area, with feel-like temperatures reaching into the mid to upper 90s.
Tomorrow will feel even more hot and humid than today. Below I have a map of the likely heat indices during the day. The hottest temperatures will once again occur near the Philadelphia and Newark areas. These areas often see warmer than normal temperatures than surrounding areas, due to the increased amount of asphalt, which absorbs heat, while areas with more forest and green space often stay a few degrees cooler. The rest of the coverage will have heat indices in the 90s.
Thursday and Friday should be as hot, if not hotter than Wednesday. We'll have some thunderstorms, and maybe even a chance for a few severe storms Thursday night.
Saturday needs to be watched for the potential of a much more widespread severe weather event. As I explained in last nights discussion, with heat and humidity building all week, conditions will be conductive for severe storms.
A heat advisory and excessive heat watch has been issued for Mercer County. Also, an air quality advisory has been issued for the entire coverage area. I expect heat advisories to expand tomorrow, and the excessive heat watch could very well become a warning.
Excessive heat is considered the second deadliest weather event, only behind extreme cold. During this kind of heat, when it can feel like 105+, try to be careful and drink plenty of water when outside.
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