From the Spaceflight Meteorology Group:

The National Weather Service has issued a Flash Flood Watch that includes JSC and vicinity beginning 7PM tonight valid through 7PM Tuesday. Periods of heavy rain, either indirectly or directly related to Tropical Storm Nicholas are expected during this period.  Widespread accumulations totals of 5 to 10 inches with isolated higher amounts is expected by Tuesday night.

Any road closures may be found on this web site, Transtar Traffic Updates