I just looked at the NWS precip totals in the area — over 25” in a fairly large area WNW of Galveston (but still not up to Houston... yet...)
That band heading into the Houston area looks wicked, including multiple tornado warnings too. Being on a roof could get VERY hairy. (70 tornado warnings associated w/ Harvey so far, they are saying on KHUO right now.)
From FlightAware:
Houston Bush Int’ctl (KIAH) is currently experiencing all inbound flights being held at their origin until Sunday at 07:00AM CDT due to tornado and hurricane.
William P Hobby (KHOU) is currently experiencing an airport closure until Wednesday at 08:00AM CDT due to hurricane harvey.
Victoria Rgnl (KVCT) is currently experiencing an airport closure until Sunday at 07:00AM CDT due to hurricane harvey.
Corpus Christi Intl (KCRP) is currently experiencing an airport closure until Monday at 11:00AM CDT due to hurricane harvey.
Calhoun County (KPKV) is currently experiencing an airport closure until Wednesday at 10:00AM CDT due to hurricane harvey.