Storms are firing up along a boundary just to the north of Houston this evening, especially over areas from The Woodlands to Conroe. The National Weather Service has issued a flash flood warning for this part of the region until 6:45pm CT. This means flooding may quickly develop as rains continue.

It appears as though these storms will continue to develop over primarily the northern Houston metro area this evening, north of Interstate 10, before tapering off tonight.
However it seems likely that another, more organized system will move into the Houston region from the west on Thursday morning, bringing considerable rainfall, certainly at least a few inches and more in isolated areas. Although this is far from a certainty, we are going to have to watch closely for more flooding tomorrow.
Posted at 5:20pm CT on Wednesday by Eric Berger