Here is a time lapse video of weather conditions during the late afternoon of July 4th at Cold Brook Nature Preserve in the Oldwick Village section of Hunterdon County. It was the beginnings of the third heatwave of the Summer of 2013. Temperatures got up to just about 90 degrees in South Plainfield as well as the rest of the Central Jersey area. Couple that with high humidity, and clouds bubbled up during the afternoon, but dissipated before nightfall.