The Atlantic hurricane season runs from June 1 through November 30, and most of what determines how a data center comes through a storm is settled before the first forecast cone is published. Fuel contracts, generator condition, roof integrity, and the decision rules for relocating equipment all have lead times measured in weeks. A named storm leaves days.
The organizations that struggle are rarely the ones without a plan. They are the ones whose plan assumes fuel trucks will arrive, staff will be able to get in, and equipment can be moved at the last minute. In a regional storm, all three of those resources are contested at once.
How Should You Prepare Fuel and Generators?
Start with the fuel supply, because it is the dependency most likely to fail under regional stress.
Confirm that delivery contracts are current, that they specify priority or emergency terms, and that the supplier understands your site's tank capacity and fill point. Then ask the harder question: how many other customers hold the same priority terms, and where does the supplier draw fuel from? A contract with a local distributor is only as good as that distributor's access to a terminal and its supply of trucks and drivers during an evacuation. A second supplier drawing from a different terminal is worth arranging before the season. The mechanics of runtime and delivery limits are covered in more detail in planning generator fuel supply for extended outages.
Top off tanks early in the season and again when a storm threatens, while delivery is still routine.
Generators should be exercised under load before the season, not just started. Review the maintenance record for open items, check batteries and block heaters, and confirm the transfer switches have actually transferred recently. Run a fuel quality test if one has not been done in the past year, since stored diesel degrades and a storm is the worst time to discover sediment or water in the tank.
Why Is Water the Bigger Threat to a Data Center?
Wind gets the attention, but water ends more data center operations than wind does.
Have the roof inspected before the season, with specific attention to penetrations for rooftop equipment, drains, and flashing. Wind-driven rain enters through gaps that never leak in ordinary weather. Clear roof drains and scuppers so standing water does not find a new path.
Know where water will go at grade. Check whether the building sits in a flood zone on current FEMA flood maps, which floor the critical equipment is on, and whether generator, switchgear, and fuel systems are above credible flood levels. Equipment that cannot be raised may need temporary barriers or pumps staged in advance.
Stage supplies inside: plastic sheeting, pumps, wet vacuums, and sandbags where appropriate. When water does get in, what happens next matters, and the steps for salvaging hardware after water or smoke damage are easier to follow when the materials are already on site.
People
A facility with power and no staff is not operating.
Decide who rides out the storm on site, if anyone, and document that decision along with the conditions under which they leave. Provide food, water, sleeping arrangements, and communications that do not depend on the local cellular network. Satellite phones or messaging are worth testing before they are needed.
For staff who evacuate, pre-book lodging outside the likely impact area. Hotels fill quickly once a storm is forecast, and a recovery team scattered across several states is slow to reassemble.
Keep an accurate call tree, a core part of any business continuity plan, including personal contact details, and confirm how staff will learn when it is safe to return.
When Should You Move Workloads or Equipment?
At triggers decided in advance and tied to official forecast products. The most important pre-season decision is when you will move workloads or equipment, and it should be made in a meeting in May, not on a conference call during a watch.
Tie triggers to published forecast products. The National Hurricane Center issues a hurricane watch when hurricane conditions are possible, generally 48 hours before tropical-storm-force winds are expected, and a warning at about 36 hours. A rule such as "at a watch for our county, begin failover; at a warning, stop all non-essential site activity" removes the debate when judgment is under pressure.
Failover of workloads to a secondary site is the usual first step, and it depends on the recovery site being outside the same storm track. That is a site selection question, and choosing a disaster recovery site location with regional weather in mind is what makes this step meaningful. The physical side of failover, including shipping media and moving staff, is where DR failover logistics either work or do not.
Moving physical equipment out of the path is a different decision with a much longer lead time. Deinstalling, packing, and trucking even a modest footprint takes days, and once evacuation orders are issued, roads congest and fuel along the route becomes scarce. If physical relocation is part of the plan, the trigger has to come well before landfall, the transport has to be reserved in advance, and the destination has to be ready to receive.
How Do You Get Back In After the Storm?
Getting back in is often slower than getting out.
Roads may be closed, curfews may be in force, and some jurisdictions restrict re-entry to credentialed personnel. Find out whether your county or city operates a business re-entry program and register before the season.
Assume utility power will be out longer than the storm itself. Plan for extended generator operation, and identify where temporary infrastructure, such as portable power, cooling, or modular capacity, could come from if the primary facility is damaged but the business still needs to run somewhere.
Before re-energizing anything that may have been exposed to water, have it inspected. Powering on wet equipment turns a cleaning job into a replacement job.
Finally, schedule a review once the season ends. Note which triggers fired, which contracts performed, and which assumptions were wrong, and fix them while the details are fresh.