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Abbreviations and codes used in the observer's diary

Table 2: Code for wind speed

Coded Entry (Equivalent speed at 10 m in knots)Beaufort ForceSpecification
00 0 Calm: smoke rises vertically
02 1 Light air: direction of wind shown by smoke drift but not by wind vanes
05 2 Light breeze: wind felt on face; leaves rustle; ordinary vane moved by wind
09 3 Gentle breeze: leaves and small twigs in constant motion; wind extends light flag
13 4 Moderate breeze: raises dust and loose paper; small branches are moved
19 5 Fresh breeze: small trees in leaf begin to sway; crested wavelets form on inland waters
24 6 Strong breeze: large branches in motion; umbrellas used with difficulty
30 7 Near gale: whole trees in motion; inconvenience felt when walking against the wind
(Force 7 is not regarded as a gale)
37 8 Gale: breaks twigs off trees; generally impedes progress
44 9 Strong gale: slight structural damage occurs (chimney pots and slates removed)
52 10 Storm: seldom experienced inland; trees uprooted; considerable structural damage occurs
60 11 Violent storm: very rarely experienced; accompanied by widespread damage
68 12 Hurricane: extremely rare; widespread damage and loss of life


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