2 min read · Updated 19 May 2026
A storm jib is a small, very strong headsail set in severe weather to keep a yacht balanced and under control — a sail whose purpose is safety rather than speed, and required equipment for many offshore races. It sits at the very end of the headsail range, beyond even the heavy-weather J4, and it is one of the storm sails that complete a seaworthy sail wardrobe.
What the storm jib does
When the wind reaches the point where even the smallest working headsail is too much, a yacht needs a way to keep sailing safely. The storm jib provides it. Carrying only a small area of heavy, strongly reinforced cloth, set low and well inboard, it lets the boat keep making way and staying balanced — able to work to windward off a lee shore, heave to, or simply keep steerage — in conditions that would be dangerous under more sail.
It is usually cut from bright orange or other high-visibility material so the boat can be seen in poor conditions, and its size, construction and fittings are tightly specified by offshore safety rules.
When and why it is carried
The storm jib is set in genuinely severe weather, almost always paired with a deeply reefed mainsail or with a trysail in place of the main. Together those small, strong sails keep the rig balanced and the boat manageable when the priority has shifted entirely from racing to seamanship and safety.
For offshore and category racing, carrying a storm jib is typically compulsory. The safety regulations that govern races such as the bluewater classics require yachts to carry storm sails of limited area and strong build, and to be able to set them — requirements set out in each race's safety category and notice of race, as covered in our offshore regatta guides. A strict inshore one-design may not need one for buoy racing, but any boat venturing offshore does. For the wider inventory, see the sails pillar.
Frequently asked questions
- What is a storm jib?
- A storm jib is a small, heavily built headsail set in severe weather. Its job is not speed but control — keeping a yacht balanced and able to make way safely in strong winds and big seas. It is often made from bright orange or high-visibility cloth and is required equipment for many offshore races.
- When do you use a storm jib?
- A storm jib is set in genuinely severe conditions, beyond the range of the smallest working headsail. Paired with a deeply reefed mainsail or a trysail, it lets a yacht keep sailing under control — making way to windward, heaving to, or working clear of a hazard — when carrying more sail would be unsafe.
- What is the difference between a storm jib and a J4?
- A J4 is the smallest performance headsail, still cut to race the boat to windward efficiently in heavy weather. A storm jib is smaller and stronger again, built purely for safe control rather than speed, and it is governed by offshore safety regulations covering its size, cloth and fittings. The J4 is for racing in a blow; the storm jib is for survival.
- Is a storm jib compulsory?
- For many offshore and category races it is. Offshore safety regulations typically require yachts to carry a storm jib (and often a trysail) of limited area and strong construction, and to be able to set them. The exact requirements are set out in the race's safety category and notice of race.