|
Beaufort scalespeed of the wind to one height of 10 m on flat land
compass
card
|
direction
|
wind
|
international symbol
|
NORTH
|
tramontana
or north wind
|
N
|
NORTH-EAST
|
greco,
gregale or northeast wind
|
NE
|
EAST
|
levante
or eastrly wind
|
E
|
SOUTH-EAST
|
sirocco
|
SE
|
SOUTH
|
auster or south wind
|
S
|
SOUTH-WEST
|
libeccio,
garbino or southwest wind
|
SW
|
WEST
|
ponente,
espero or west wind
|
W
|
NORTH-WEST
|
maestro,
maestrale, mistral or northwest wind
|
NW
|
knot, international (kt) | = 0.514444 m/s |
knot (imperial knot) | = 0.514772 m/s |
knot (US knot) | = 0.514791 m/s |
1 mile nautical/h | = 1 knot |
1 MACH | = 1228 km/h |
mile nautical international | = 1852 m |
mile nautical italian | = 1851.85 m |
geografic mile | = 1855.4 m |
mile UK (nautical) | = 1853.184 m |
mile US (nautical) | = 1852 m |
an outline of the knotThe historical origin of this measure goes back to the sailing-ship age. When the commander of a clipper wanted to know the own speed, it made to spin to breast one line, on which they were present of the nodes distanced between they of 1/120 of mile (15.433m). To the extremity of the sunk line, a tablet (log-chip), that it acted as from floating anchor. In such a way while the sailing-ship was left over, the line carried out outboard motor making to parade a node after the other, therefore after 30 minuteren of hourglass (30 ") came counted how many nodes were past, than therefore represented with a lot approximation the speed of the ship. |
denomination | height waves (m) | |
0 | calm | 0 |
1 | nearly calm | < 0.1 |
2 | little moved | 0.1 - 0.5 |
3 | moved | 0.5 - 1.3 |
4 | a lot moved | 1.3 - 2.5 |
5 | rough | 2.5 - 4 |
6 | much rough | 4 - 6 |
7 | flood | 6 - 9 |
8 | much flood | 9 - 14 |
9 | stormy | > 14 |
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