Beaufort Scale and Nautical Conditions Flashcards

A set of fill-in-the-blank flashcards covering the Beaufort Scale descriptions, wind speeds, wave heights, and vessel tactics.

At Beaufort force $0$, the wind speed is __________ and the water surface appears mirror-like.

$$< 1\,\text{knot}$$

Beaufort force $1$, described as __________, is characterized by wind speeds of $1-3\,\text{knots}$ and ripples.

Light air

Beaufort force $2$ (Light breeze) features wave heights ranging from __________.

$$0.3-0.6\,\text{m}$$

At Beaufort force $3$ (Gentle breeze), the sea surface shows large wavelets and occasional __________.

white caps

A wind speed of $11-16\,\text{knots}$ and frequent white caps indicate Beaufort force __________.

$$4$$

In Beaufort force $4$ and $5$, a power vessel should __________ to prevent slamming.

Reduce speed

Beaufort force $5$ is described as a __________ with wave heights of $2-3\,\text{m}$.

Fresh breeze

At Beaufort force $6$ (Strong breeze), a power vessel should operate at __________.

Displacement speed

Beaufort force $7$ (Near gale) is characterized by wind speeds of __________ and foam in streaks.

$$28-33\,\text{knots}$$

At Beaufort force $8$ (Gale), a sailing vessel should use a __________ and storm jib.

Deep reefed main

The wave height for Beaufort force $8$ ranges from __________.

$$5.5-7.5\,\text{m}$$

Beaufort force $9$ is described as a __________ with wind speeds of $41-47\,\text{knots}$.

Severe gale

For Beaufort forces $10$, $11$, and $12$, the required vessel action is __________.

Survival tactics

A Beaufort force of $10$ is characterized by very high waves and __________.

long breaking crests

Beaufort force $11$ is described as a __________, featuring wind speeds of $56-63\,\text{knots}$.

Violent storm

Beaufort force $12$ indicates __________ conditions with wind speeds of $\ge 64\,\text{knots}$.

Hurricane Force

At Beaufort force $12$, the wave height reaches __________.

$$\ge 14\,\text{m}$$