* WHAT...For the first Heat Advisory, heat index values up to 95. For the second Heat Advisory, heat index values up to 99 expected. * WHERE...Western and Central Hillsborough, Belknap, Merrimack, Strafford, Sullivan, Southern Grafton, Cheshire, Eastern Hillsborough, and Interior Rockingham Counties. * WHEN...For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...It will remain warm tonight as overnight lows only dip into the mid 60s to lower 70s.