Weather by Nilsson Jones Premium Content  Southeast Queenslanders are being told to brace for a cold snap over the weekend after it was smashed by severe thunderstorms last night, with giant hail, 100,000 lightning strikes, flash flooding, and damaging winds leaving their mark. Brisbane's peak-hour traffic was thrown into chaos with suspended trains across the network, traffic light outages, flash flooding and hour-long delays to commuters through key inner-city routes. And trains between Roma Street and Beenleigh stations remained suspended as of midnight due to an overhead power line issue caused by the earlier storm activity.   Energex reported about 11,000 properties without power at 6.30pm, most on the Sunshine Coast.