From the Spaceflight Meteorology Group:
The National Weather Service has issued a Flash Flood Watch that begins at 7PM that includes JSC and vicinity until 7AM Tuesday. For much of the rest of Monday afternoon and evening only a few light showers are forecast from time to time. The greater threat for heavy rains and severe thunderstorms still looks to be in the 4AM to 8AM Tuesday time frame. Heavier rain and stronger storms also look to be barely off to the west and north of JSC overnight. Keep in mind some hail, strong gusty winds and even a few tornadoes are likely overnight in southeast Texas. Total rainfall around JSC should average 0.8 to 1.2 inches with a few locations receiving up to 2 inches which may cause some brief street and minor flooding issues onsite.
In addition, ahead of this storm systems winds remain breezy with several gusts recorded at JSC Bldg 30 between 35 and 40 mph. A Wind Advisory is in effect until 10PM this evening.
Road closures can be found at www.drivetexas.org