At 4:57 a.m. on Thursday, the National Weather Service issued a dense fog advisory in effect until 9 a.m. for Warren, McKean, Huntingdon, Somerset, Bedford, Fulton and Franklin counties.

Local officials are expanding their tools to issue warnings during disasters with new technology and “old school” approaches. But convincing people to leave home isn’t always simple.

Across Florida, summer heat has generally been extended by about a week and a half to two weeks. This is based on a Climate ...