From Rusty Garrett:
Hot and humid air continues to be drawn up from the south across Central Texas. Dewpoints in the 70s will help to push heat index values, or "feels like" temperatures, to near or above 100°! Make sure to stay very well hydrated! Winds will be breezy at times, out of the south at 15 to 25 mph with higher gusts.
The Memorial Day weekend has the potential to be an active one at times. Most of Saturday will be similar to Friday with hot and very humid conditions. There will be the potential for isolated showers and storms to pop up late in the day and evening, due to high instability and plenty of moisture in the atmosphere. The cap (layer of warm air aloft that suppresses storm development) may or may not break as a cool front approaches from the north. If any rain or storms develop during the late afternoon hours, they will have the potential to become strong to severe very quickly. The main threats from any storms that may develop would be large hail and damaging winds. Rain and storm chances still remain low at this point however, at just 20% to 30%.
The best chance for scattered showers and storms over the holiday weekend should be Sunday afternoon and evening as the front, mentioned above, moves into Central Texas. A few storms will have the potential to become strong to severe. Rain and storm chances should be around 40% to 50%, but a complete washout is not expected. High temperatures Sunday will be in the mid to upper 80s under mostly cloudy skies.
The front should stall out near or across Central Texas on Memorial Day, keeping scattered showers and storms in the forecast. Rain and storm chances will be 30% to 40% with highs in the low to mid 80s and overnight lows in the mid 60s.