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Name

Dates

Minimum

Maximum Sustained Winds (kt)

Hurricane Daniel Hurricane Ioke Tropical Depression - 03C Tropical Depression - 04C Tropical Depression - 05C

July 24-26 August 20-27** September 19-20 September 26-27 October 13-14

Pressure (hPa) 980** 920** 1007 1007 1007

80** 140** 30 30 30

Overview of the 2006 Central North Pacific Tropical Cyclone Season James Weyman and Andy Nash James.weyman@noaa.gov and Andy.nash@noaa.gov

Central Pacific Hurricane Center/Weather Forecast Office Honolulu

In the central north Pacific, the tropical cyclone 2006 season activity was normal with five systems occurring within the area of responsibility of the Central Pacific Hurricane Center (CPHC) which extends from 140W longitude to 180 longitude. In most tropical cyclone seasons, the majority of the systems form in the east Pacific and move into the central Pacific. However in El Nino years, this pattern shifts with most systems forming in the central Pacific. The 2006 season with developing El Nino conditions displayed this pattern shift with four systems developing in the central Pacific and only one moving into the basin from the east Pacific. Also in El Nino years, there is an increased probability of late season systems. This occurred in 2006. Two tropical depressions developed in September and one in October. Of note was Hurricane Ioke. 1) It rapidly intensified into a hurricane in 24 hours; 2) It was the first named system to form in the central Pacific since 2003; 3) It was the fifth Category 5 hurricane recorded in the central Pacific; 4) It maintained Category 4 or higher intensity for 9 days; 5) Its estimated lowest pressure of approximately 920 hPa was the lowest pressure on record for central Pacific hurricanes; and 6) It produced significant impacts on Johnston and Midway Islands. The only other system of note was the remnants of TD-04C which fueled heavy rain and flooding over the Big Island in October.

Table 1. List of Tropical Cyclones . ** denotes information for only that portion of the tropical cyclone’s lifetime in the central north Pacific (CPHC’s area of responsibility).

12 hr

24 hr

36 hr

48 hr

72 hr

96 hr

120 hr

32.6(46)

51.5(39)

73.0(35)

89.6(31)

111.9(29)

157.3(29)

227.5(29)

45.3

86.0

135.5

198.0

290.0

317.9

367.2

34.6

54.1

73.4

83.7

73.5

98.1

132.7

31.6

49.1

65.5

81.8

75.1

100.9

135.2

43.1

75.6

115.9

162.5

240.0

313.5

377.2

29.1

45.7

64.2

82.2

101.5

140.3

202.3

42.5

63.8

84.7

94.7

109.9

143.0

176.8

28.4

55.5

86.0

105.5

131.1

182.8

253.8

28.6

50.9

75.4

91.3

109.9

158.0

223.1

27.1

48.3

70.9

88.0

112.1

155.1

221.4

45.3

98.9

91.5

103.8

118.0

149.2

204.3

33.2

55.8

88.7

109.7

140.4

185.1

253.4

Table 2. Overall Track Verification. Table entries are track forecast errors, measured in nautical miles.

Values in parentheses indicate the number of forecasts.

OFCL CLP5 BAMD BAMM BAMS GFDL AVNO GUNS GUNA CONU UKMET NOGAPS

Note: The official CPHC track forecast error at 48 hours was well below the GPRA goal of 128nm.

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