The National Weather Service (NWS) has issued a warning that it will rain for some, not all, in Houston on Thursday, but not all. The NWS defines this term as "isolated," meaning that only small, scattered pockets of the area may receive rain. This aligns with NWS "chance" forecasts where showers or storms cover roughly 30-60% of the population. Widespread rain is considered widespread, often occurring in high-profile areas. The timing and location of the rain could change, but it is expected to occur throughout the day.