 This weather report is sponsored by Bell House Medical, home of the Master Grab Bar. Need grab bars? You call, they install so you don't fall. 302-644-4404. Here's a look at your Delmarva forecast. A heat advisory begins at 11 a.m. tomorrow and remains in effect until 8 p.m. tomorrow night. Lows dip down to about 79 tonight under partly cloudy skies with a slight chance of thunderstorms. Winds out of the southwest 8 to 15 miles per hour.