I'd guess about 12 mph with the gear.
So six hours they are out of trouble.
Full Disclosure: If they were in Texas, heading towards Austin, they'd be in trouble. Those hills in Bastrop State Park are no fun at all.
Prayers for those evacuating.
Full Disclosure: Are all the Galveston and Houston hospitals equipped with handy basement-mounted generators like in N.O. ?
We don't usually have basements in TX. The generators here are usually outside on stilts or on top of the buildings.
The Texas Medical Center got wasted in TS Allison. They are totally ready, in fact, we all watched with horror as NO went through the same things we went through in 2001.
All ground floor entrances now have flood doors for one thing, plus generators are mostly above ground level, to answer specific question. Battery powered IV and emergency lighting have been checked and replaced as needed, that was a huge problem. Picksys (automated medication dispensing) machines are either bypassed or set for manual operation. These are all lessons learned. Too bad NO didn't learn from our mistakes. I'm sure we offered the information.