If your car stalls in rapidly rising waters, abandon it immediately and climb to higher ground. Many people have perished in floods who thought that they had experienced high water before and new what to expect. Many factors govern how rapidly and how deeply floodwaters will penetrate. A miscalculation may prove to be fatal. Others put off evacuating until their normal routes of egress were no longer passable, and in the time lost finding a passable alternative exit, they were overtaken by the water.
Mother nature can be formidable.
Take her seriously, and take seriously the warnings and instructions of public officials who are trying to bring everyone through the emergency as well as possible.