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Conversions
 
KNOTS to MPH or KPH  
Temperature
Celsius Fahrenheit Celsius Fahrenheit Celsius Fahrenheit
40 104 21 69.8 2 35.6
39 102.2 20 68 1 33.8
37 98.6 18 64.4 -1 30.2
36 96.8 17 62 -2 28.4
35 95 16 60.8 -3 26.6
34 93.3 15 59 -4 24.8
33 91.4 14 57.2 -5 23
32 89.6 13 55.4 -6 21.2
31 87.8 12 53.6 -7 19.7
30 86 11 51.8 -8 17.6
29 84.2 10 50 -9 15.8
28 82.4 9 48.2 -10 14
27 80.6 8 46.4 -11 12.2
26 78.8 7 44.6 -12 10.4
25 77 6 42.8 -13 8.6
24 75.2 5 41 -14 6.8
23 73.4 4 39.2 -15 5
22 71.6 3 37.4 -16 3.2

 

Millibars to Inches

1 millibar = .03 inches
1019 mb = 30.10 in
1018 mb = 30.07 in
1017 mb = 30.04 in
1016 mb = 30.01 in
1015 mb = 29.98 in
1014 mb = 29.95 in
1013 mb = 29.92 in
1012 mb = 29.89 in
1011 mb = 29.86 in
1010 mb = 29.83 in
1009 mb = 29.80 in
1008 mb = 29.77 in
1007 mb = 29.74 in
1006 mb = 29.71 in
1005 mb = 29.68 in
1004 mb = 29.65 in
1003 mb = 29.62 in
1002 mb = 29.59 in
1001 mb = 29.56 in
1000 mb = 29.53 in
999 mb = 29.50 in
998 mb = 29.47 in
997 mb = 29.44 in
996 mb = 29.41 in
995 mb = 29.38 in
994 mb = 29.35 in
993 mb = 29.32 in
992 mb = 29.29 in
991 mb = 29.26 in
990 mb = 29.23 in
989 mb = 29.20 in
988 mb = 29.17 in
987 mb = 29.14 in
986 mb = 29.11 in
985 mb = 29.08 in
984 mb = 29.05 in
983 mb = 29.02 in
982 mb = 28.99 in
981 mb = 28.96 in
980 mb = 28.93 in
979 mb = 28.90 in
978 mb = 28.87 in
977 mb = 28.84 in
976 mb = 28.81 in
975 mb = 28.78 in
974 mb = 28.75 in
973 mb = 28.72 in
972 mb = 28.69 in
971 mb = 28.66 in
970 mb = 28.63 in
969 mb = 28.60 in
968 mb = 28.57 in
967 mb = 28.54 in
966 mb = 28.51 in
965 mb = 28.48 in
964 mb = 28.45 in
963 mb = 28.42 in
962 mb = 28.39 in
961 mb = 28.36 in
960 mb = 28.33 in
959 mb = 28.30 in
958 mb = 28.27 in
957 mb = 28.24 in
956 mb = 28.21 in
955 mb = 28.18 in
954 mb = 28.15 in
953 mb = 28.12 in
952 mb = 28.09 in
951 mb = 28.06 in
950 mb = 28.03 in
949 mb = 28.00 in
948 mb = 27.97 in
947 mb = 27.94 in
946 mb = 27.91 in
945 mb = 27.88 in
944 mb = 27.85 in
943 mb = 27.82 in
942 mb = 27.79 in
941 mb = 27.76 in
940 mb = 27.73 in
939 mb = 27.70 in
938 mb = 27.67 in
937 mb = 27.64 in
936 mb = 27.61 in
935 mb = 27.58 in
934 mb = 27.55 in
933 mb = 27.52 in
932 mb = 27.49 in
931 mb = 27.46 in
930 mb = 27.43 in
929 mb = 27.40 in
928 mb = 27.37 in
927 mb = 27.34 in
926 mb = 27.31 in
925 mb = 27.28 in
924 mb = 27.25 in
923 mb = 27.22 in
922 mb = 27.19 in
921 mb = 27.16 in
920 mb = 27.13 in
919 mb = 27.10 in
918 mb = 27.07 in
917 mb = 27.04 in
916 mb = 27.01 in
915 mb = 26.98 in
914 mb = 26.95 in
913 mb = 26.92 in
912 mb = 26.89 in
911 mb = 26.86 in
910 mb = 26.83 in
909 mb = 26.80 in
908 mb = 26.77 in
907 mb = 26.74 in
906 mb = 26.71 in
905 mb = 26.68 in
904 mb = 26.65 in
903 mb = 26.62 in
902 mb = 26.59 in
901 mb = 26.56 in
900 mb = 26.53 in
899 mb = 26.50 in
898 mb = 26.47 in
897 mb = 26.44 in
896 mb = 26.41 in
895 mb = 26.38 in
894 mb = 26.35 in
893 mb = 26.32 in
892 mb = 26.29 in
891 mb = 26.26 in
890 mb = 26.23 in
889 mb = 26.20 in
888 mb = 26.17 in
Kts X 1.1507771555 = Mph   Mph / 1.150777155 = Kts
Mph X 1.609344 = Kph     Kph / 1.609344 = Mph
Kts X 1.85198479488 = Kph     Kph / 1.85198479488 = Kts

Beaufort Wind Scale

Force

Wind Speed

Description Effects Land / Sea
mph km/hr knots
0 0 0 0 Calm

Still, calm air, smoke will rise vertically. Water is mirror-like.

1 1-3
mph
1-5
kph
1-3
knots
Light Air

Rising smoke drifts, wind vane is inactive. Small ripples appear on water surface.

2 4-7
mph
6-11
kph
4-6
knots
Light Breeze

Leaves rustle, can feel wind on your face, wind vanes begin to move. Small wavelets develop, crests are glassy.

3 8-12
mph
12-19
kph
7-10
knots
Gentle Breeze

Leaves and small twigs move, light weight flags extend. Large wavelets, crests start to break, some whitecaps.

4 13-18
mph
20-28
kph
11-16
knots
Moderate Breeze

Small branches move, raises dust, leaves and paper. Small waves develop, becoming longer, whitecaps.

5 19-24
mph
29-38
kph
17-21
knots
Fresh Breeze

Small trees sway. White crested wavelets (whitecaps) form, some spray.

6 25-31
mph
39-49
kph
22-27
knots
Strong Breeze

Large tree branches move,  telephone wires begin to "whistle", umbrellas are difficult to keep under control. Larger waves form, whitecaps prevalent, spray.

7 32-38
mph
50-61
kph
28-33
knots
Moderate or Near Gale

Large trees sway, becoming difficult to walk. Larger waves develop, white foam from breaking waves begins to be blown.

8 39-46
mph
62-74
kph
34-40
knots
Gale or Fresh Gale

Twigs and small branches are broken from trees, walking is difficult. Moderately large waves with blown foam.

9 47-54
mph
75-88
kph
41-47
knots
Strong Gale

Slight damage occurs to buildings, shingles are blown off of roofs. High waves (6 metres), rolling seas, dense foam, Blowing spray reduces visibility.

10 55-63
mph
89-102
kph
48-55
knots
Whole Gale or Storm

Trees are broken or uprooted, building damage is considerable. Large waves (6-9 metres), overhanging crests, sea becomes white with foam, heavy rolling, reduced visibility.

11 64-72
mph
103-117
kph
56-63
knots
Violent Storm

Extensive widespread damage. Large waves (9-14 metres), white foam, visibility further reduced.

12 73+
mph
118+
kph
64+
knots
Hurricane

Extreme destruction, devastation. Large waves over 14 metres, air filled with foam, sea white with foam and driving spray, little visibility.

 

Cat
Hurricane Scale
 Pressure(Millibars)
Mph
Kph
Knots
1
74-95
119-153
64-82
980+
2
96-110
154-177
83-95
979-965
3
111-130
178-209
96-113
964-945
4
131-155
210-249
114-135
944-920
5
156+
250+
136+
below 920

 



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Weather conversion tables created by Weather.org 

 

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