Monday's storms not only delivered torrential rains, but also numerous reports of severe weather, including two tornadoes and possibly a third. The atmosphere was primed for severe weather as low pressure rode up a front moving in from the west and upper-level winds diverged allowing storms to build. Just before 9 AM, a line of storms moved from Eastern Wharton county across the Fort Bend county line. Several people saw funnel clouds over Highway 99 and then lower to touchdown in the Mission Bend area. There was damage to homes and garage doors there and in the Meadows neighborhood just north and east of Sugar Land.
That storm continue to move into west Houston stalling a bit allowing 3"-4" rainfall to accumulate in less than a few hours causing widespread street flooding. A second line of storms developed south of Wharton around 10 AM and moved toward Bonney near Highway 288 in Brazoria county just before noon. There were reports of two 18 wheelers blown off the highway then. That same storm bowled toward Texas City, where a second tornado touched down doing significant damage to the Mall of the Mainland. Car windows were blown out and part of the roof at the mall caved in.
KHOU's HD Doppler caught these two tornadoes. The first one is seen as a yellow tube bearing down on the Mission Bend area before 9 AM. The tube indicates rotation in the lower part of the storm. Also, note how much lightning was occurring:
Here's the second storm with another yellow tube near Bonney. This is the same storm that headed for Texas City:
As of Monday evening, the severe weather threats are all gone and most of the flood water has receded. Clean-up in the affected area continues and the National Weather Service will assess the damage on Tuesday to determine the intensity of the tornadoes. Based on damage I've seen, these tornadoes will likely be declared EF0 or EF1 with winds ranging from 65-110 mph.