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Beaufort Scale

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Beaufort wind scale for land areas

  • Make your observations in an open location, e.g. school field.
  • Use the scale below to estimate wind speed.
  • Enter CALM if there is no wind.
Wind Force
Description
Speed
Specifications
kph
knots
0Calm00Smoke rises vertically
1Light Air1-51-3Direction shown by smoke drift but not by wind vanes
2Light Breeze6-114-6Wind felt on face; leaves rustle; wind vane moved by wind
3Gentle Breeze12-197-10Leaves and small twigs in constant motion; light flags extended
4Moderate Breeze20-2811-16Raises dust and loose paper; small branches moved.
5Fresh Breeze29-3817-21Small trees in leaf begin to sway; crested wavelets form on inland waters.
6Strong Breeze38-4922-27Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty.
7Near Gale50-6128-33Whole trees in motion; inconvenience felt when walking against the wind.
8Gale62-7434-40Twigs break off trees; generally impedes progress.
9Strong Gale75-8841-47Slight structural damage (chimney pots and slates removed).
10Storm89-10248-55Seldom experienced inland; trees uprooted; considerable structural damage
11Violent Storm103-11756-63Very rarely experienced; accompanied by widespread damage.
12Hurricane118 plus64 plusDevastation

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