Fast-developing showers and thunderstorms have quickly brought 2 to 3 inches of rain over parts of western Houston this evening, and the National Weather Service has issued a flash flood warning for Katy and other parts of western Harris County. It is in effect until 11:30pm CT.
It appears as though this cluster of very heavy storms is moving steadily northward, and the Houston area may see a bit of a break as they clear the area.
However high resolution forecast models continue to indicate additional heavy shower development tonight across the Houston area, possibly again over western parts of the metro area as well as over Matagorda County. Given the surprise development of these heavy storms earlier this evening I would be hesitant to rule anything out.
What we do know for sure is that the atmosphere remains exceedingly moist, and the threat of heavy rainfall will not be far away for the next couple of days.
Posted at 9:50pm CT Sunday