Extreme Heat Warning: New Castle; Mercer; Salem; Gloucester; Camden; Northwestern Burlington; Delaware; Philadelphia; Eastern Chester; Eastern Montgomery; Lower Bucks

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Extreme Heat Warning — New Castle; Mercer; Salem; Gloucester; Camden; Northwestern Burlington; Delaware; Philadelphia; Eastern Chester; Eastern Montgomery; Lower Bucks Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions with heat index values between 105 and 115 degrees expected each day. * WHERE...Portions of northern Delaware, central and southern New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Very warm low temperatures in the mid 70s to low 80s at night will not offer any relief from the heat. This combined with multiple days of near record breaking temperatures will exacerbate the impacts from the heat and humidity. The hottest conditions are expected to occur today through Friday.