Tables



 
 

Table 1: Summary of Atlantic tropical cyclone statistics for 1944-94. The numbered columns show yearly incidence of:
  1. named storms (NS)
  2. named storms days (NSD)
  3. hurricanes (H)
  4. hurricane days (HD)
  5. "intense", category 3-4-5 hurricanes (IH)
  6. category 3-4-5 hurricane days (IHD)
  7. hurricane destruction potential (HDP)
  8. net tropical cyclone activity (NTC)
Mean values are shown for each column for the periods 1944-69 and 1970-94. Ratios of the means for 1944-69 to those for 1970-94 are given at the bottom.
Year
NS 
NSD 
HD 
IH 
IHD 
HDP 
NTC 
1944 
11 53 7 27 3 4.25 73 115
1945 
11 42 5 14 2 3.75 42 86
1946 
6 17 3 6 1 .50 14 38
1947 
9 52 5 28 2 6.50 88 106
1948 
9 52 6 29 4 4.75 85 118
1949 
13 62 7 22 3 3.25 64 114
1950 
13 98 11 60 7 15.50 200 237
1951 
10 58 8 36 2 5.00 113 119
1952 
7 40 6 23 3 4.00 70 96
1953 
14 64 6 18 3 5.50 59 119
1954 
11 52 8 32 2 8.50 91 128
1955 
12 83 9 47 5 13.75 158 195
1956 
8 30 4 13 2 2.25 39 68
1957 
8 38 3 21 2 5.25 67 84
1958 
10 56 7 30 4 8.25 94 137
1959 
11 40 7 22 2 3.75 60 97
1960
7 30 4 18 2 9.50 72 96
1961 
11 71 8 48 6 20.75 170 218
1962 
5 22 3 11 0 0.00 26 33
1963 
9 52 7 37 2 5.50 103 115
1964 
12 71 6 43 5 9.75 139 165
1965 
6 40 4 27 1 6.25 73 85
1966 
11 64 7 42 3 7.00 121 138
1967 
8 58 6 36 1 3.25 98 96
1968 
7 26 4 10 0 0.00 18 40
1969 
17 83 12 40 3 2.75 110 154
Mean 1944-1969 
9.85 
52.08
6.27 
28.46 
2.69 
6.13 
86.42 
115.27 
1970 
10 23 5 7 2 1.00 18 63
1971 
13 63 6 29 1 1.00 65 94
1972 
4 21 3 6 0 0.00 14 28
1973 
7 32 4 10 1 0.25 21 51
1974 
7 32 4 14 2 4.25 46 75
1975 
8 42 6 20 3 2.25 53 91
1976 
8 45 6 26 2 1.00 65 83
1977 
6 14 5 7 1 1.00 19 46
1978 
11 40 5 14 2 3.50 40 85
1979 
8 44 5 22 2 5.75 73 94
1980 
11 60 9 38 2 7.25 126 134
1981
11 60 7 22 3 3.75 63 112
1982 
5 16 2 6 1 1.25 18 36
1983 
4 14 3 4 1 0.25 8 31
1984 
12 51 5 18 1 0.75 42 77
1985 
11 51 7 21 3 4.00 61 109
1986
6 23 4 10 0 .00 25 38
1987 
7 37 3 5 1 0.50 11 47
1988 
12 47 5 21 3 9.00 81 121
1989 
11 66 7 32 2 9.75 108 135
1990 
14 66 8 27 1 1.00 57 101
1991 
8 22 4 8 2 1.25 22 59
1992 
6 39 4 16 1 3.25 51 66
1993 
8 30 4 10 1 0.75 23 53
1994 
7 28 3 7 0 0.00 15 36
Mean 1970-1994 
8.6 
38.64 
4.96 
16
1.52 
2.51 
45 
74.6 
Ratio 
1.14 
1.35 
1.26 
1.78 
1.77 
2.44 
1.92 
1.55 

 
 
 
 
 




Table 2: Specific central pressure, wind speed and surge criteria for the five hurricane intensity categories of the Saffir-Simpson scale. The basis for the relative potential destruction shown in the right hand column is described at length in Landsea 1991.
Saffir-
Simpson
Category
Range of Central
Pressure in
Millibars 
Maximum Sustained
Wind Speed (ms-1
Storm
Surge (m)
Relative Potential
Destruction
1
980 
33-42 
1.0-1.7 
965-979 
43-49 
1.8-2.6 
10 
945-964 
50-58 
2.7-3.8 
50 
920-944 
59-69 
3.9-5.6 
100 
< 920 
> 69 
5.6 
250 

 
 
 



Table 3: Contrast of US landfalling intense (SS 3,4, or 5) hurricanes for two 47-year groupings of inferred weak versus strong conveyor (i.e., dry versus wet Sahel) periods. Figure 3 shows the locations of the two (Florida versus East Coast) regions considered.
 
Peninsula Florida
East Coast
East Total
Above average Sahel rainfall
and strong conveyor belt conditions
1921-1967 (47 years)
15
12
27
Below average Sahel rainfall
and weak conveyor belt conditions
1900-1920 plus 1968-1993 (47 years)
4
5
9
Ratio (strong, wet/weak, dry)
3.75
2.40
3.00

 
 
 
 



Table 4: Contrast of the incidence of Caribbean basin hurricanes(H) and intense hurricanes (IH) during two recent 24-year periods of inferred weak versus strong Atlantic conveyor modes (cf., Figs. 1, 17 and 18).
No. of
Hurricanes (H)
No. of Intense
Hurricanes (IH)
Above average Sahel rainfall
and strong conveyor belt conditions
1944-1967 (24 years)
38
22
Below average Sahel rainfall
and weak conveyor belt conditions
1970-1993 (24 years)
17
9
Ratio (strong, wet/weak, dry)
2.24
2.44