| Next |
The Beaufort Scale
The current of air, which balances high and low air pressure, is called wind. We usually measure it with the internationally used Beaufort scale. Sir Francis Beaufort (1777 - 1857), a British admiral and hydrograph, devised this scale in 1806 by summing up the effects of wind on water, sailing ships underway and land.
This is the reason why the Beaufort scale is not a linear measure. The scale expresses the wind force more than the wind speed. Nevertheless, there is a causal connection between wind speed and wind force. So it seems useful to compare force with speed, which is measured in meters per second (m/s), kilometers per hour (km/h) and knots (sea miles per hour).
1 nautical mile (nm) = 1,852 kilometer
1 knot (kn) = 1nm per hour
The Beaufort scale |
|||||
|---|---|---|---|---|---|
|
bft |
kn |
m/s |
km/h |
classification |
appearance of wind effects |
|
0 |
0-1 |
0-0,2 |
0-1 |
calm |
smoke rises vertically |
|
1 |
1-3 |
0,3-1,5 |
1-5 |
light air |
smoke drift indicates wind direction |
|
2 |
4-6 |
1,6-3,3 |
6-11 |
light breeze |
wind felt on face |
|
3 |
7-10 |
3,4-5,4 |
12-19 |
gentle breeze |
leaves are moving, light flags extended |
|
4 |
11-15 |
5,5-7,9 |
20-28 |
moderate breeze |
twigs are moving, flags extended |
|
5 |
16-21 |
8,0-10,7 |
29-38 |
fresh breeze |
small trees in leaf begin to sway |
|
6 |
22-27 |
10,8-13,8 |
39-49 |
strong breeze |
large tree branches moving, wind whistling in wires |
|
7 |
28-33 |
13,9-17,1 |
50-61 |
near gale |
smaller trees begin to sway, noticeably difficult to walk |
|
8 |
34-40 |
17,2-20,7 |
62-74 |
gale |
whole trees in motion, twigs are broken from trees, walking into the wind is very difficult |
|
9 |
41-47 |
20,8-24,4 |
75-88 |
strong gale |
slight structural damage occurs, slates blown off of roofs |
|
10 |
48-55 |
24,5-28,4 |
89-102 |
storm |
trees uprooted, considerable building damages |
|
11 |
56-63 |
28,5-32,6 |
103-117 |
violent storm |
widespread damage |
|
12 |
64< |
32,7< |
118 |
hurricane |
extreme destruction |
More news
Get your sailing Croatia summer vacation at a great price
2009-03-06
15% early booking discount for Adriatic Challenge’s fleet is now prolonged till April 1st 2009. Whether you are seeking for a learn- to- sail- holiday in Croatia or wish to charter a fully equipped yacht on the Dalmatian coastline, check out our new offer and get your summer vacation at a very reasonable price:
• 19 Bavaria 42 match (3 cab.) BEFORE 1.980.-, NOW 1.683.-
• 10 Bavaria 47 cruiser (4 cabins), BEFORE 3.285.-, NOW 2.763.-
Send your charter request on info@adriatic-challenge.com
Sport sailing week in Croatia 20.06.2009-27.06.2009.
2009-02-06
Join us today for sailing trough beautifull Croatia. Sailing week is an idea of few sport sailing fanatics who are working trough summer as skippers, and competing in the winter, spring and autumn on the Adriatic sea.
Check availability in our BOOKING LIST!


TAKE 1 WEEK PRACTICAL AND THEORETICAL COURSE FOR BOAT LEADER’S LICENCE CATEGORY B EXAM
Click here for more information
Adriatic Challenge d.o.o. 








