sentences:  Thousands of residents in coastal areas of southern Texas and northern Mexico were asked to pay attention to the hurricane warnings and to move towards higher ground.The National Weather Service warned the cities of Cameron and Kenedy, and Willacy County in southern Texas that severe flooding is the deadliest threat associated with the storm.In low-lying rural areas near the mouth of the Rio Grande, an estimated 20,000 residents were urged to seek shelter, as the inadequate drainage in these areas make them in danger to severe flooding.