From the Spaceflight Meteorology Group:

The Tornado Watch issued earlier this morning for JSC has been cancelled.  At 10:01 AM the heaviest rainfall and stronger part of the squall line was east of JSC moving away.  Moderate to light rainfall will continue for the next 1 to 2 hours followed by some rapid clearing and breezy west winds this afternoon.

Maximum gust at JSC today was 44 mph when the line of storms arrived around 9:30 AM.  As of 10:03 AM 0.54 inches of rain has fallen at JSC Building 30.  NASA Ellington has recorded 0.90 inches so far as well.