The Port of Mobile closed to all vessel traffic Friday morning after the U.S. Coast Guard set Port Condition ZULO, suspending cargo handling at Alabama Port Authority public berths hours before Hurricane Isaias was forecast to slam into the Gulf Coast as a Category 2 storm.

The Coast Guard designation means gale-force winds are expected within 12 hours. Vessel and terminal operations at the port's public berths will stay suspended until conditions allow safe assessment and clearance, port leaders said. Only activities specifically authorized by the Coast Guard can continue.

Isaias — pronounced "issy-ay-ahs" — strengthened to dangerous Category 3 status over the Gulf of Mexico on Thursday night, making it the first hurricane to reach the United States in 2026. Forecasts from supply chain risk analytics firm Everstream put landfall late Friday night or early Saturday morning around Mobile Bay, Alabama.

What does this change for shippers and carriers? In short: a closed Gulf port, two interstate freight corridors at risk, and a storm that should clear fast rather than stall.

Everstream's chief science officer, Mark Russo, said in a video briefing that Isaias will likely weaken to Category 1 or strong tropical storm status just before coming ashore, then move fairly quickly overland rather than stalling and dumping concentrated rainfall. That puts expected precipitation at 3 to 7 inches — the low end of the hurricane spectrum, which can run well into double digits.

Wind speeds, storm surge and power outage potential will all be moderate, Russo said. By the standards of recent Gulf hurricanes like Helene and Milton, Isaias will not be a major event, he added.

Which freight routes are exposed?

The supply chain impact, according to Everstream, centers on roads rather than ports or airports:

• I-10 between Slidell, Louisiana, and the middle of the Florida panhandle — flooding, slowdowns or potential closures
• I-65 near Mobile, Alabama — same risks

At the time of the briefing, Everstream said no cargo airports were expected to close, and the Port of New Orleans planned to keep operating. The Port of Mobile, sitting squarely in the storm's target zone, is the outlier — and it shut down before the winds arrived, not after.

For truckers and forwarders with Gulf Coast commitments, the practical math is straightforward. Expect reroute costs and transit delays on the I-10 and I-65 corridors through the weekend. Cargo booked through Mobile waits, full stop, until the Coast Guard and port authority complete post-storm assessments. New Orleans capacity may absorb some diverted volumes, but the shutdown window looks short if the storm keeps moving as forecast.

Why the timing matters more than the wind speed

Here is the strange part. By the calendar, Isaias is the latest-forming hurricane of the Atlantic hurricane season in recorded history. The delay stems from the "Super El Nino" weather pattern now sitting in the Pacific Ocean. There has never been a hurricane in the Gulf of Mexico during the previous three Super El Ninos — 1982, 1997 and 2015.

So a season that started historically quiet just delivered its first U.S. landfall. Shippers who wrote off 2026 Gulf risk based on the slow start now have a live disruption on their hands, even if a modest one.

Relief logistics mobilize

The American Logistics Aid Network (ALAN) is urging Gulf Coast businesses to heed local advisories, and asking logistics professionals everywhere to stand ready to help. Earlier this week, ALAN entered the preparedness stage of its storm activation, working with non-profit partners on prepositioning supplies. The organization has also begun publishing hurricane supply chain impact data through its Rapid Assessment webpage.

"Isaias is expected to make landfall as a Category 2 hurricane sometime Friday — with massive rainfall, a potentially life-threatening storm surge, and winds as high as 110 miles per hour. As a result, we are officially mobilizing to help," said Kathy Fulton, ALAN's executive director.

Fulton's wind figure is higher than Everstream's weakening-landfall scenario, a reminder that intensity forecasts carry real spread this close to shore. Either way, the operational picture for freight is the same: a brief, sharp disruption concentrated on Mobile and the interstate corridors feeding it.

Assuming the storm tracks as forecast and keeps moving, the Port of Mobile could move to damage assessment and reopening within days — but any deviation toward a slower track or a stronger landfall would push rainfall totals, outage counts and reopening timelines in the wrong direction.