Though this has little to do with the business of real estate, for those of us who like to look out the window from time to time you may find this interesting.
Beaufort Scales (Wind Speed)
Force Speed Name Conditions
knots km/h mi/h 0 <> <> <> Calm Sea like a mirror. Smoke rises vertically. 1 1-3 1-5 1-4 Light air Ripples only. Smoke drifts and leaves rustle. 2 4-6 6-11 5-7 Light breeze Small wavelets (0.2 m). Crests have a glassy appearance. Wind felt on face. 3 7-10 12-19 8-11 Gentle breeze Large wavelets (0.6 m), crests begin to break. Flags extended, leaves move. 4 11-16 20-29 12-18 Moderate breeze Small waves (1 m), some whitecaps. Dust and small branches move. 5 17-21 30-39 19-24 Fresh breeze Moderate waves (1.8 m), many whitecaps. Small trees begin to sway. 6 22-27 40-50 25-31 Strong breeze Large waves (3 m), probably some spray. Large branches move, wires whistle, umbrellas are difficult to control. 7 28-33 51-61 32-38 Near gale Mounting sea (4 m) with foam blown in streaks downwind. Whole trees in motion, inconvenience in walking. 8 34-40 62-74 39-46 Gale Moderately high waves (5.5 m), crests break into spindrift. Difficult to walk against wind. Twigs and small branches blown off trees. 9 41-47 76-87 47-54 Strong gale High waves (7 m), dense foam, visibility affected. Minor structural damage may occur (shingles blown off roofs). 10 48-55 88-102 55-63 Storm Very high waves (9 m), heavy sea roll, visibility impaired. Surface generally white. Trees uprooted, structural damage likely. 11 56-63 103-118 64-73 Violent storm Exceptionally high waves (11 m), visibility poor. Widespread damage to structures. 12 64+ 119+ 74+ Hurricane 14 m waves, air filled with foam and spray, visibility bad. Severe structural damage to buildings, wide spread devastation.
- Note: wave heights apply to the open sea; waves in sheltered waters will be lower and steeper. As sailors know, other factors such as swell and depth can also modify wave heights.