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Beaufort Wind Scale Visualizer – Online Speed & Sea State

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Beaufort Wind Scale Visualizer

Interactive tool to explore wind speeds, sea states, and wave conditions across all 13 Beaufort forces

Unit:
mph
0F2F4F6F8F10F12+
Quick Jump:
3 Gentle Breeze
Large wavelets, crests begin to break
Wave Height
0.6 m / 2.0 ft

Typical significant wave height

Land Conditions

Leaves and small twigs in constant motion; wind extends light flag

Sea Conditions

Large wavelets; crests begin to break; scattered whitecaps

All Unit Conversions
mph10.0
km/h16.1
knots8.7
m/s4.5
Complete Beaufort Scale Reference
Force Name Wind (mph) Wind (km/h) Wind (knots) Wave (m) Sea State
0Calm<1<2<10Mirror-like
1Light Air1-32-51-30.1Ripples
2Light Breeze4-76-114-60.2-0.3Small wavelets
3Gentle Breeze8-1212-197-100.6-1Large wavelets
4Moderate Breeze13-1820-2911-161-1.5Small waves
5Fresh Breeze19-2430-3917-212-2.5Moderate waves
6Strong Breeze25-3140-5022-273-4Large waves
7Near Gale32-3851-6228-334-5.5Sea heaps up
8Gale39-4663-7534-405.5-7.5Moderately high
9Strong Gale47-5476-8741-477-10High waves
10Storm55-6388-10248-559-12.5Very high waves
11Violent Storm64-72103-11756-6311.5-16Exceptionally high
12Hurricane≥73≥118≥6414+Huge waves

Frequently Asked Questions

What is the Beaufort Wind Scale?

The Beaufort Wind Scale is an empirical measure that relates wind speed to observed conditions at sea and on land. It ranges from Force 0 (calm, wind under 1 mph) to Force 12 (hurricane-force winds of 73 mph or greater). The scale was originally developed for maritime use but is now widely applied in weather forecasting, marine navigation, and outdoor activity planning worldwide.

Who invented the Beaufort Scale and when?

Admiral Sir Francis Beaufort, an Irish-born Royal Navy officer, devised the scale in 1805. He standardized the terminology sailors used to describe wind and sea conditions. Initially based on sail settings for naval vessels, the scale was later adapted to include specific wind speed ranges and wave height estimates, becoming the international standard we use today.

How do I interpret Beaufort Force numbers for boating safety?

For small boats and recreational vessels, Force 4 (Moderate Breeze, 13-18 mph) is generally considered the upper limit for comfortable conditions. Force 6 (Strong Breeze, 25-31 mph) warrants caution and small craft advisories are often issued. Force 8 (Gale, 39-46 mph) and above is dangerous for most small to medium vessels. Always check local marine forecasts before heading out.

What's the difference between Beaufort Force 6 and Force 8?

Force 6 (Strong Breeze, 25-31 mph) produces large waves of 3-4 meters with extensive whitecaps and some spray. Force 8 (Gale, 39-46 mph) creates moderately high waves of 5.5-7.5 meters with breaking crests forming spindrift and well-marked foam streaks. The jump from Force 6 to Force 8 nearly doubles the wave height and dramatically increases the risk to marine vessels.

How accurate are wave height predictions in the Beaufort Scale?

Wave heights in the Beaufort Scale are approximate and represent typical significant wave heights for fully developed seas in open ocean conditions. Actual wave heights depend on fetch (distance over water the wind blows), duration, water depth, and local geography. Nearshore and enclosed waters typically experience smaller waves than the scale predicts for a given wind speed.

Can the Beaufort Scale be used for land-based weather observations?

Yes. Each Beaufort Force has corresponding land-based visual indicators. For example, Force 3 (Gentle Breeze) causes leaves and twigs to move constantly; Force 5 (Fresh Breeze) makes small trees sway; Force 7 (Near Gale) makes walking difficult; and Force 9 (Strong Gale) can cause minor structural damage. These land descriptions help observers estimate wind speed without instruments.

What is the highest Beaufort Force ever recorded?

While Force 12 (≥73 mph) is the top of the traditional scale, some modern extensions go up to Force 17 for extreme tropical cyclones. The highest reliably measured wind speed was 253 mph (407 km/h) during Tropical Cyclone Olivia (1996) on Barrow Island, Australia. Hurricane Patricia (2015) produced 215 mph (345 km/h) sustained winds. These exceed Force 12 by a wide margin, illustrating the scale's original limits for 19th-century maritime use.

Why do different sources show slightly different wind speed ranges for each Force?

The Beaufort Scale has evolved over two centuries. Wind speeds were originally described qualitatively (e.g., "that which a well-conditioned man-of-war could just carry in chase, full and by"). Modern numerical equivalents were standardized in the 20th century, but slight variations exist between meteorological agencies (WMO, NOAA, UK Met Office). The ranges used here follow the most widely accepted modern standards. Knots, mph, km/h, and m/s conversions may also introduce minor rounding differences.

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