Rescuers have been searching through fresh piles of rubble after the last of the collapsed Florida condo building was demolished but the crews have faced a new challenge from thunderstorms and strong winds which have now hit the area as Tropical Storm Elsa approaches. The National Weather Service said there is a slight risk of severe thunderstorms across portions of South Florida on Tuesday 'due to an elevated tornado threat' associated with the storm. A video tweeted by Miami-Dade Fire Rescue shows workers battling strong winds even whilst standing on top of the debris of what was Champlain Towers South building in Surfside. Despite the arrival of inclement weather due to Tropical Storm Elsa, first responders continue working on the debris pile of the Champlain Towers building collapse in Surfside The approach of the storm forced Florida officials to demolish the remaining portion of a condo building that collapsed 11 days ago Miami-Dade Assistant Fire Chief Raide Jadallah said rescuers were focusing on a stairwell section, but inclement weather was hampering the search, particularly in a garage area that was filling with water which crews had to pump out water. The latest forecasts showed the storm moving westward, mostly sparing south Florida, but the area near the collapsed building experienced thunderstorms, and the National Weather Service issued a severe thunderstorm warning for Miami Beach, which is just south of Surfside, where Champlain Towers South was located. Mr Jadallah said rescuers planned to continue. 'Now that we don't have an issue with the building, the only time that we're stopping is lightning,' he said. Although updated forecasts predict the Surfside area is likely to avoid the brunt of the storm on its projected course to the north from Cuba, scattered showers and thunderstorms were forecast. Strong winds have now hit the area as Tropical Storm Elsa approaches Tropical Storm Elsa swept over western Cuba near Havana with strong rain and winds on Monday night, with forecasters saying it would move on to the Florida Keys on Tuesday and Florida's central Gulf coast by Wednesday Flood warnings were in effect for the western part of the state with the Miami area largely unaffected Tropical Storm Watches and Tropical Storm Warnings were in effect for western Florida