The National Weather Service says strong to severe thunderstorms are possible on Memorial day, with storms expected to develop late this afternoon, then gradually form into a cluster over the Rio Grande and Edwards Plateau this evening and and move across the Hill Country and I-35 corridor overnight to the US Highway 77 corridor by morning. The main threats will start as large to very large hail and damaging wind gusts, then gradually mainly damaging wind gusts as the cluster progresses. Locally heavy rains are possible and may cause flooding, especially in areas that have received heavy rains over the last few days.
More information from the National Weather Service