A complex of very slow thunderstorms is slowly expanding north in the San Antonio metro. Over 3.5 inches of rain has fallen over the past 2 hours at Stinson Airport on the south side of town. Hourly rainfall rates are over two inches per hour. Water rescues are being reported on Interstate 35 at Nogalitos Street and at Bascum Blvd and Deely Place – both on the south side of town. The heavy rains are slowly shifting north and may soon encompass much of San Antonio. This is a potentially dangerous flash flood situation developing. Due to the copious amounts of moisture in place along with the training thunderstorms we could see several inches of rain over the coming hours. Stay off the roads if possible as we may see flash flooding rapidly develop through 4 AM. If rain rates continue as high as they are a significant flooding event may occur in the coming hours across portions of the San Antonio metro.