Why ships are lost after the weather arrives — not before
Estimated read time: 80–95 minutes
Audience: Cadet → AB → Junior Officer → Chief Mate
Introduction – Weather doesn’t sink ships, preparation does
Severe weather rarely appears without warning. Forecasts, satellite imagery, and routing advice give crews time to prepare. Yet ships continue to suffer deck damage, cargo loss, and fatalities in conditions that were anticipated hours or days in advance.
The reason is not lack of information. It is incomplete deck preparation.
Weather preparation on deck is not about battening down everything. It is about identifying which systems will be loaded, which margins will shrink, and which failures will cascade once motion and water interact.
What heavy weather does to the deck environment
As sea state builds, decks experience green water, vibration, and cyclic loading. Equipment that was static becomes dynamic. Lashings work loose. Drainage paths are overwhelmed. Access routes become hazardous.
Importantly, heavy weather rarely creates new weaknesses. It exposes existing ones. Anything marginal before the weather arrived becomes critical once the ship starts working.
Securing for motion, not for rest
Many items on deck are secured to prevent movement at rest, not under sustained motion. Portable equipment, spare gear, containers, and deck stores may be lashed adequately for normal conditions but inadequately for repeated acceleration and deceleration.
The failure pattern is familiar: an item shifts slightly, damages its securing, then becomes a projectile or obstruction once fully loose.
Cold weather and ice: weight you didn’t plan for
In cold regions, ice accretion adds weight high above the deck, raising the vessel’s centre of gravity and loading rails, ladders, and equipment beyond their normal duty. Ice also destroys friction. Non-slip coatings become irrelevant when covered.
Crews often underestimate how quickly ice builds and overestimate their ability to remove it safely once the ship is rolling.
🔻 Real-World Failure: Loss of El Faro — Deck Preparation Lessons
In 2015, the cargo vessel El Faro was lost during Hurricane Joaquin with the loss of all hands. While the primary causes involved routing and propulsion, post-incident analysis highlighted deck-level vulnerabilities that contributed to loss of survivability.
Cargo securing was compromised under extreme motion. Water ingress on deck systems exacerbated stability issues. Once the weather exceeded the ship’s degraded margins, recovery options disappeared rapidly.
For deck crews, the lesson is not about hurricanes alone. It is about recognising that once severe weather is encountered, deck interventions are no longer possible. Preparation must be complete beforehand.
The timing problem: when preparation stops being possible
A defining feature of heavy weather incidents is the point at which deck access becomes unsafe. Past that moment, unsecured items cannot be fixed, blocked drains cannot be cleared, and damaged lashings cannot be adjusted.
Senior deck officers plan preparation backwards from this point — not forwards from calm conditions.
Knowledge to Carry Forward
Weather preparation on deck is a race against time and physics. Heavy seas amplify existing weaknesses and remove opportunities for correction. Safe ships are not those that withstand weather through strength alone, but those that enter it with margins intact.
Competent deck officers assume that anything not secured early will be impossible to secure later.
Tags
On Deck, Weather Preparation, Heavy Weather, Ice Accretion, Deck Securing, Green Water, Cold Weather Operations, Deck Safety, Human Factors, Failure Modes