Severe storms and flooding throughout southern Texas hit the town of Mercedes hard between Tuesday, June 19 and Thursday, June 21. At least 20 rescues were reported in the area and its surrounding cities due to the flash flooding.This video shows flood water that submerged roads and cars near a highway in Mercedes, Texas, on Wednesday, June 20.More rainfall is expected for Hidalgo County on June 21, according to local news reports.A Texas judge issued a declaration of disaster as residents in Hidalgo County were evacuated on June 20 due to the flooding. Credit: Carmen Nino via Storyful