Extended range forecast of atlantic seasonal hurricane activity and u. S. Landfall strike probability for 2007



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2005

3 Dec. 2004


Update

1 April


Update

31 May


Update

5 August


Update

2 Sept.


Update

3 Oct.

Obs.


No. of Hurricanes

6

7

8

10

10

11

14

No. of Named Storms

11

13

15

20

20

20

26

No. of Hurricane Days

25

35

45

55

45

40

48

No. of Named Storm Days

55

65

75

95

95

100

116

Intense Hurricanes

3

3

4

6

6

6

7

Intense Hurricane Days

6

7

11

18

15

13

16.75

Net Tropical Cyclone Activity

115

135

170

235

220

215

263



2006

6 Dec. 2005


Update

4 April


Update

31 May


Update

3 August


Update

1 Sept.


Update

3 Oct.



Obs.

No. of Hurricanes

9

9

9

7

5

6

5

No. of Named Storms

17

17

17

15

13

11

9

No. of Hurricane Days

45

45

45

35

13

23

20

No. of Named Storm Days

85

85

85

75

50

58

50

Intense Hurricanes

5

5

5

3

2

2

2

Intense Hurricane Days

13

13

13

8

4

3

3

Net Tropical Cyclone Activity

195

195

195

140

90

95

85




2 Professor Emeritus of Atmospheric Science

3 Research Associate

4 In order to facilitate easier comparison with other seasonal forecasting groups (e.g., NOAA, Tropical Storm Risk, etc.), we have decided to start predicting an Accumulated Cyclone Energy (ACE) index as part of our seasonal forecasts. ACE is defined to be a measure of a named storm’s potential for wind and storm surge destruction defined as the sum of the square of a named storm’s maximum wind speed (in 104 knots2) for each 6-hour period of its existence. ACE is similar to the Hurricane Destruction Potential (HDP) index that we forecast for a number of years.



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