The Beaufort Scale
The Beaufort Scale describes the wind strength numerically with reference to discernible indicators.
We have abbreviated it on the drag and drop data forms as follows.
|0||Dead calm. Smoke rises vertically|
|1||Direction shown by some smoke drift but not by wind vane|
|2||Wind felt on face, leaves rustle. Ordinary vanes moved|
|3||Leaves & small twigs in constant motion. Light flag extended|
|4||Raises dust & loose paper. Small branches moved|
|5||Small trees with leaves begin to move|
|6||Large branches in motion. Whistling in telephone wires.|
We use this scale to indicate the level of interference experienced by an attentive observer. We have abbreviated it on the drag and drop data forms as follows.
|1||Some noise , e.g, distant traffic, dog barking, but not distracting.|
|2||Significant noise but not constant enough to reduce detection.|
|3||Constant noise, e.g heavy traffic, roaring creek.|
|4||Unable to hear any call, e.g a passing train.|