"... All impacts are unknown & beyond anything experienced," the NWS added in a dire tweet.
This event is unprecedented & all impacts are unknown & beyond anything experienced. Follow orders from officials to ensure safety#Harveypic.twitter.com/IjpWLey1h8
One to 2 feet of rain has already fallen on Houston, with more on the way. If you are in Houston or the surrounding area, it's important to listen to local officials and find shelter in a safe place. If you're in a safe area, don't travel.* Read more...