Proudman Building, Liverpool weather station | National Tidal and Sea Level Facility
Source: http://www.ntslf.org/engineers/proudman-building-liverpool-weather-station
Archived: 2026-04-23 17:21
Proudman Building, Liverpool weather station | National Tidal and Sea Level Facility
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National Tidal and Sea Level Facility
Tides
Storm surges
Products
About
Search
About tides
Tides – questions and answers
Sea level – questions and answers
The Doodson-Légé Tide Predicting Machine
Tide clocks and watches
Tidal river bores
The River Dee / Afon Dyfrdwy
The River Mersey
UK National Tide Gauge Network
Data availability
Tidal predictions – UK and Ireland
UK South Atlantic Network
Gibraltar sea level station
Tidal predictions – South Atlantic
Tide gauge instruments
Definitions of tidal levels
Chart datum and ordnance datum
Permanent Service for Mean Sea Level (PSMSL)
(external link)
Engineers’ page
Proudman Building, Liverpool weather station
About storm surges
Tide-surge model
Surge model forecast
Surge model archive
Surge model archive: 2004–2019
Surge model ensemble forecasting
Skew surges
Skew surge history: England – south
Skew surge history: England – east
Skew surge history: England – west
Skew surge history: Wales
Skew surge history: Scotland
Skew surge history: Northern Ireland
Skew surge history: Isle of Man
Skew surge history: Channel Islands
Sea level trends
Sea level trend charts
Software
Contact us
Proudman Building, Liverpool weather station
Wind speed conversion table (at 10 metres above ground)
Beaufort scale
Range of wind speeds
Mean wind speed
knots
m s
−1
km h
−1
miles h
−1
knots
m s
−1
km h
−1
miles h
−1
0
Calm
< 1
0.0 – 0.2
< 1
< 1
0
0.0
0
0
1
Light air
1 – 3
0.3 – 1.5
1 – 5
1 – 3
2
0.9
3
2
2
Light breeze
4 – 6
1.6 – 3.3
6 – 11
4 – 7
5
2.4
9
5
3
Gentle breeze
7 – 10
3.4 – 5.4
12 – 19
8 – 12
9
4.4
16
10
4
Moderate breeze
11 – 16
5.5 – 7.9
20 – 28
13 – 18
13
6.7
24
15
5
Fresh breeze
17 – 21
8.0 – 10.7
29 – 38
19 – 24
18
9.3
34
21
6
Strong breeze
22 – 27
10.8 – 13.8
39 – 49
25 – 31
24
12.3
44
28
7
Near gale
28 – 33
13.9 – 17.1
50 – 61
32 – 38
30
15.5
55
35
8
Gale
34 – 40
17.2 – 20.7
62 – 74
39 – 46
37
18.9
68
42
9
Strong gale
41 – 47
20.8 – 24.4
75 – 88
47 – 54
44
22.6
82
50
10
Storm
48 – 55
24.5 – 8.4
89 – 102
55 – 63
52
26.4
96
59
11
Violent Storm
56 – 63
28.5 – 32.6
103 – 117
64 – 72
60
30.5
110
68
12
Hurricane
64 – 71
32.7 – 36.9
118 – 133
73 – 82
68
34.8
125
78
Skip to main content
National Tidal and Sea Level Facility
Tides
Storm surges
Products
About
Search
About tides
Tides – questions and answers
Sea level – questions and answers
The Doodson-Légé Tide Predicting Machine
Tide clocks and watches
Tidal river bores
The River Dee / Afon Dyfrdwy
The River Mersey
UK National Tide Gauge Network
Data availability
Tidal predictions – UK and Ireland
UK South Atlantic Network
Gibraltar sea level station
Tidal predictions – South Atlantic
Tide gauge instruments
Definitions of tidal levels
Chart datum and ordnance datum
Permanent Service for Mean Sea Level (PSMSL)
(external link)
Engineers’ page
Proudman Building, Liverpool weather station
About storm surges
Tide-surge model
Surge model forecast
Surge model archive
Surge model archive: 2004–2019
Surge model ensemble forecasting
Skew surges
Skew surge history: England – south
Skew surge history: England – east
Skew surge history: England – west
Skew surge history: Wales
Skew surge history: Scotland
Skew surge history: Northern Ireland
Skew surge history: Isle of Man
Skew surge history: Channel Islands
Sea level trends
Sea level trend charts
Software
Contact us
Proudman Building, Liverpool weather station
Wind speed conversion table (at 10 metres above ground)
Beaufort scale
Range of wind speeds
Mean wind speed
knots
m s
−1
km h
−1
miles h
−1
knots
m s
−1
km h
−1
miles h
−1
0
Calm
< 1
0.0 – 0.2
< 1
< 1
0
0.0
0
0
1
Light air
1 – 3
0.3 – 1.5
1 – 5
1 – 3
2
0.9
3
2
2
Light breeze
4 – 6
1.6 – 3.3
6 – 11
4 – 7
5
2.4
9
5
3
Gentle breeze
7 – 10
3.4 – 5.4
12 – 19
8 – 12
9
4.4
16
10
4
Moderate breeze
11 – 16
5.5 – 7.9
20 – 28
13 – 18
13
6.7
24
15
5
Fresh breeze
17 – 21
8.0 – 10.7
29 – 38
19 – 24
18
9.3
34
21
6
Strong breeze
22 – 27
10.8 – 13.8
39 – 49
25 – 31
24
12.3
44
28
7
Near gale
28 – 33
13.9 – 17.1
50 – 61
32 – 38
30
15.5
55
35
8
Gale
34 – 40
17.2 – 20.7
62 – 74
39 – 46
37
18.9
68
42
9
Strong gale
41 – 47
20.8 – 24.4
75 – 88
47 – 54
44
22.6
82
50
10
Storm
48 – 55
24.5 – 8.4
89 – 102
55 – 63
52
26.4
96
59
11
Violent Storm
56 – 63
28.5 – 32.6
103 – 117
64 – 72
60
30.5
110
68
12
Hurricane
64 – 71
32.7 – 36.9
118 – 133
73 – 82
68
34.8
125
78