22
11
Beaufort
Scale Level
Description
Wind Speed
Land Condition
0
Calm
Calm. Smoke rises vertically.
1
Light air
2
Light breeze
3
Gentle breeze
4
Moderate breeze
5
Fresh breeze
6
Strong breeze
7
High wind
< 1 km/h
< 1 mph
< 1 knot
.
< 0 3 m/s
.
1 1 ~ 5km/h
1 ~ 3 mph
1 ~ 3 knot
.
.
0 3 ~ 1 5 m/s
6 ~ 11 km/h
4 ~ 7 mph
4 ~ 6 knot
.
.
1 6 ~ 3 3 m/s
12 ~ 19 km/h
8 ~ 12 mph
7 ~ 10 knot
.
.
3 4 ~ 5 4 m/s
20 ~ 28 km/h
13 ~ 17 mph
11 ~ 16 knot
.
.
5 5 ~ 7 9 m/s
29 ~ 38 km/h
18 ~ 24 mph
17 ~ 21 knot
.
.
8 0 ~ 10 7 m/s
39 ~ 49 km/h
25 ~ 30 mph
22 ~ 27 knot
.
.
10 8 ~ 13 8 m/s
50 ~ 61 km/h
31 ~ 38 mph
28 ~ 33 knot
.
.
13 9 ~ 17 1 m/s
Smoke drifts indicate wind
direction. Leaves and wind
vanes are stationary.
Wind can be felt on exposed
skin. Leaves rustle. Wind
vanes begin to move.
Leaves and small twigs
constantly moving, light
flags extended.
Dust and loose paper
raised. Small branches
begin to move.
Branches of a moderate
size move. Small trees in
leaf begin to sway.
Whole trees in motion.
Effort needed to walk
against the wind.
Large branches in motion.
Whistling heard in overhead wires.
Umbrella use becomes difficult.
Empty plastic bins tip over.
Beaufort
Scale Level
Description
Wind Speed
Land Condition
0
Calm
Calm. Smoke rises vertically
1
Light air
2
Light breeze
3
Gentle breeze
4
Moderate breeze
5
Fresh breeze
6
Strong breeze
7
High wind
< 1 km/h
< 1 mph
< 1 knot
.
< 0 3 m/s
.
1 1 ~ 5km/h
1 ~ 3 mph
1 ~ 3 knot
.
.
0 3 ~ 1 5 m/s
6 ~ 11 km/h
4 ~ 7 mph
4 ~ 6 knot
.
.
1 6 ~ 3 3 m/s
12 ~ 19 km/h
8 ~ 12 mph
7 ~ 10 knot
.
.
3 4 ~ 5 4 m/s
20 ~ 28 km/h
13 ~ 17 mph
11 ~ 16 knot
.
.
5 5 ~ 7 9 m/s
29 ~ 38 km/h
18 ~ 24 mph
17 ~ 21 knot
.
.
8 0 ~ 10 7 m/s
39 ~ 49 km/h
25 ~ 30 mph
22 ~ 27 knot
.
.
10 8 ~ 13 8 m/s
50 ~ 61 km/h
31 ~ 38 mph
28 ~ 33 knot
.
.
13 9 ~ 17 1 m/s
Smoke drifts indicate wind
direction. Leaves and wind
vanes are stationary.
Wind can be felt on exposed
skin. Leaves rustle. Wind
vanes begin to move.
Leaves and small twigs
constantly moving, light
flags extended.
Dust and loose paper
raised. Small branches
begin to move.
Branches of a moderate
size move. Small trees in
leaf begin to sway.
Whole trees in motion.
Effort needed to walk
against the wind.
Some twigs broken from
trees. Cars veer on the
road. Progress on foot is
seriously impeded.
Some branches break off trees,
and some small trees blow
over. Construction/temporary
signs and barricades blow over.
Trees are broken off or
uprooted, structural
damage likely.
Widespread vegetation
and structural
damage likely.
Severe widespread damage to
vegetation and structures.
Debris and unsecured objects
are hurled about.
Large branches in motion.
Whistling heard in overhead wires.
Umbrella use becomes difficult.
Empty plastic bins tip over.
8
Gale
9
Strong gale
10
Storm
11
Violent storm
12
Hurricane force
62 ~ 74 km/h
39 ~ 46 mph
34 ~ 40 knot
17.2 ~ 20.7 m/s
75 ~ 88 km/h
47 ~ 54 mph
41 ~ 47 knot
20.8 ~ 24.4 m/s
89 ~ 102 km/h
55 ~ 63 mph
48 ~ 55 knot
24.5 ~ 28.4 m/s
103 ~ 117 km/h
64 ~ 73 mph
56 ~ 63 knot
28.5 ~ 32.6 m/s
≥ 118 km/h
≥ 74 mph
≥ 64 knot
≥ 32.7m/s
Heat Index range
Warning
Explanation
80°F to 90°F (27°C to 32°C)
Caution
Possibility of heat exhaustion
91°F to 105°F (33°C to 40°C)
Extreme Caution
Possibility of heat dehydration
106°F to 129°F (41°C to 54°C)
Danger
Heat exhaustion likely
≥ 130°F (≥ 55°C)
Extreme Danger
Strong risk of dehydration / sun stroke
Sunny
Partly cloudy
Cloudy
Rainy
Rainy / Stormy
Snowy
Absolute
The absolute atmospheric pressure of your location
Relative
The relative atmospheric pressure based on the sea level
