 headaches, dizziness, feeling lightheaded or nausea, those are signs that you've been in the heat too long and you need to get cool. DeSerbo says it's important to drink plenty of water, stay indoors as much as you can. If you have to be outside, wear loose-fitting clothing. Also check in on elderly neighbors and friends as well as those with special needs. Again, that heat advisory continues until 8 p.m. tonight. It could be extended through Thursday, but for now, 8 p.m.