Due to Hurricane Delta the U.S. Coast Guard has issued a condition Whiskey for the Port of New Orleans (open today, but closed tomorrow) and condition Yankee for the Port of Houston (currently closed to traffic).

U.S. Coast Guard Port Conditions for Hurricanes and Severe Weather:
Whiskey: The ALERT condition in which winds above 39 mph are expected within 72 hours.
X-Ray: The READINESS condition in which winds above 39 mph are expected within 48 hours.
Yankee: The WARNING condition in which winds above 39 mph are expected within 24 hours.
Zulu: The DANGER condition in which winds above 39 mph are expected within 12 hours and until the storm has passed and is no longer a threat.