WGN Weather Center Blog Monday afternoon’s thunderstorms brought an abrupt end to a hot, steamy day here. Outflow from the thunderstorms brought a rush of dense cold air to the surface dropping temperatures nearly 30º in less than an hour’s time. The heat relief is only temporary, however, with heat and humidity expected to return Tuesday, along with more thunderstorms. Here are some of the largest temperature drops as recorded on our WeatherBug network. Hoffman Estates 93º down to 64º a drop of 29º Wilmette 94º down to 66º a drop of 28º Algonquin 92º down to 67º a drop…