A ship in a force 12 ("hurricane-force") storm at sea, the highest rated on the Beaufort scale. The Beaufort scale (/ ˈ b oʊ f ər t / BOH-fərt) is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.

One of the first scales to estimate wind speeds and the effects was created by Britain's Admiral Sir Francis Beaufort (1774-1857). He developed the scale in 1805 to help sailors estimate the winds via visual observations. The scale starts with 0 and goes to a force of 12. The Beaufort scale is still used today to estimate wind strengths.

The Beaufort Scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale. Below is a table showing the Beaufort Scale with speeds in knots, miles per hour and kilometres per hour.

Beaufort Wind Scale. Developed in 1805 by Sir Francis Beaufort, U.K. Royal Navy. Force Wind (Knots) WMO Classification Appearance of Wind Effects; On the Water On Land; 0: Less than 1: Calm: Sea surface smooth and mirror-like: Calm, smoke rises vertically: 1: 1-3: Light Air: Scaly ripples, no foam crests:

Wind stings face in temperatures below 35 deg F (2C). Slight effort in maintaining balance against wind. Smoke rises at about 15 deg. Both slack and taut halyards whip slightly in bent position. Low moaning, rather than whistle, in the rigging. Heavy flag extends and flaps more vigorously.

The Beaufort scale, which is used in Met Office marine forecasts, is an empirical measure for describing wind intensity based on observed sea conditions. These values refer to well-developed...

2025年1月5日 · Beaufort scale, scale devised in 1805 by Commander (later Admiral and Knight Commander of the Bath) Francis Beaufort of the British navy for observing and classifying wind force at sea. Originally based on the effect of the wind on a full-rigged man-of-war, in 1838 it became mandatory for log entries in all ships in the Royal Navy .

The Beaufort Wind Force Scale, devised in the early 19th century by British naval officer Sir Francis Beaufort, remains a crucial tool for sailors and meteorologists alike. This scale quantifies wind intensity based on observed sea conditions, offering a …

2022年5月12日 · Wave height: 1-1.5 m - Sea: Small waves becoming longer, numerous whitecaps.

Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind. Whole trees in motion. Inconvenience felt in walking against wind.