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10. 48-55. Storm. Very high waves (29-41 ft) with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility. Seldom experienced on land, trees broken or uprooted, “considerable structural damage”
By international agreement, winds can be described using the Beaufort scale. Winds of force 12 and above are called “Hurricane force 12,” or whatever number is used for stronger winds.
Beaufort wind force scale
|Beaufort wind scale||Mean Wind Speed||Limits of wind speed|
The Beaufort Scale or Beaufort Wind Force Scale is a system for estimating wind strengths without the use of instruments, based on the effects wind has on the physical environment. The behaviour of smoke, waves, trees, etc., is rated on a 13 point scale of 0 (calm) to 12 (hurricane).
4-6. Light Breeze. Small wavelets, still short, but more pronounced. Crests have a glassy appearance and do not break. Wind felt on face; leaves rustle; ordinary vanes moved by wind.
How is wind speed measured?
|Wind Force||Description||Wind Speed|
I have always used the guideline of winds between 10 to 20 mph as being “breezy” and winds from 15 to 25 mph or higher to be “windy.” This doesn’t factor in possible gusty winds, just the sustain winds. – at 32 to 38 mph, whole trees will be in motion. 6- Strong breeze, 25-31 mph. 8 – Gale, 39-46 mph.
Beaufort wind force scale. The Beaufort scale, which is used in Met Office marine forecasts, is an empirical measure for describing wind intensity based on observed sea conditions. Specifications and equivalent speeds.
They do not reflect the wind speeds that you would feel on the ground – at 2 metres, wind speed may be only 50-70% of these figures. The specifications are descriptions of likely observations on land or at sea and the probable and maximum wave heights (in meters) are quoted for the open sea.
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 wind waves of the open sea. The lag effect between the wind getting up and the sea increasing should be borne in mind.
Saffir-Simpson Hurricane Wind Scale. Climatology | Names | Wind Scale | Extremes | Models | Breakpoints. The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based on a hurricane’s sustained wind speed. This scale estimates potential property damage.