Extreme Heat Warning: Southern Centre; Huntingdon; Mifflin; Juniata; Franklin; Southern Clinton; Southern Lycoming; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster

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Extreme Heat Warning — Southern Centre; Huntingdon; Mifflin; Juniata; Franklin; Southern Clinton; Southern Lycoming; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster Severity: Severe. Certainty: Likely. * WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 108 expected. For the Heat Advisory, heat index values up to 102 expected. * WHERE...A portion of central Pennsylvania. * WHEN...For the Extreme Heat Warning, from noon Wednesday to 8 PM EDT Friday. For the Heat Advisory, from 8 PM Friday to 8 PM EDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...High temperatures will exceed 100 degrees in many places Wednesday through Friday with even higher heat index values expected. Temperatures will be a few degrees lower on Saturday, but heat risks will continue.