A heat wave is breaking records in Britain, but locally we are looking at some dangerously hot days ahead, too. Get ready for a string of sunny days with 90+ temperatures and some parts of the state already under a heat advisory. Humidity is lower on Tuesday, but expect temps to climb and a heat advisory will be in effect from noon until 8 p.m. Wednesday in Bergen, Essex, Hudson, Union and Passaic counties. Humidity plus high temperatures can make it feel like almost 100. Montclair’s libraries and council chambers are available as cooling centers. Montclair Ambulance Unit wants you to stay saf…