July 27, 2023 – From the National Weather Service
High heat and humidity will be in place through Saturday.
- Heat Advisories are in effect for today (Thursday July 27) as Heat Index values will range from 100° to 105°.
- Scattered showers and thunderstorms will develop this afternoon through this evening (approximately 2pm to 10pm). Some storms may be severe with damaging wind gusts (60 to 70 mph) and heavy rain with localized flash flooding.
- Excessive Heat Warnings are in effect for the urban corridor, including Philadelphia, and parts of NJ for Heat Index Values 105° to 109° on Friday, July 28. Heat Advisories in effect most elsewhere, including Delmarva and southern NJ, though criteria for Excessive Heat Warnings are higher there.
- Afternoon and evening showers and thunderstorms possible Friday.
- Heat Advisories may be needed Saturday for the urban corridor and parts of New Jersey. Late day and evening showers and thunderstorms are likely with damaging winds and localized flash flooding possible
