Nicholas made landfall Tuesday morning along the Texas coast as a Category 1 hurricane, threatening to pummel the state with fierce winds, heavy rain and possible flooding.
Nicholas came ashore near the eastern part of the Matagorda Peninsula, about 10 miles west-southwest of Sargent Beach, Texas, about 1:30 a.m. ET Tuesday, packing 75 mph winds.
In Houston, emergency officials said high winds and heavy rain were expected and asked residents not to remove or go around the road blocks that are in place for safety.
More than 330 flights either into or out of Houston's William P. Hobby and George Bush Intercontinental airports have already been canceled for Tuesday, according to the flight-tracking website FlightAware. All Port Houston terminals will be closed Tuesday morning in anticipation of the storm, according to the port's official Twitter account.