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Welcome to the Central Pacific Ocean
Tropical Cyclone page of Hurricane Alley.
The information source used for
the graphs presented on this page is the "Best Track" files from the
Joint Typhoon Warning Center. The software used to create the
ongoing tropical cyclones tracks is Global Tracks.
Current Tropical Activity ---
From the Joint
Typhoon Warning Center
REGION 12
- FAQ--
CENTRAL PACIFIC OCEAN
Areal coverage - area north of 0° and between 140°W
and 180°E.
Names
| Alika |
| Ele |
| Huko |
| Ioke |
| Kika |
| Lana |
| Maka |
| Neke |
|
Oleka |
|
Peni |
|
Ulia |
|
Wali |
Season - May through October
Average number of tropical cyclones in a year -- 4.4
Average number of tropical cyclones in a "normal
season" --
3.0
Most active month --
August - average
2.02 storms/year
Most active period --
July through September -
96%
of all storms
Most storms in a single season -
11 in 1992 , 1994
Fewest storms in a single season --
0 in 1960, 1964, 1969, 1977, 1979
This is for JTWC (Joint Typhoon Warning Center)
Cyclone rating designation process -- MSW Averaging Period: 1 minute
Tropical Cyclone - generic term is used for all tropical
weather
disturbances
Tropical Disturbance - distinct area
of disturbed weather but
usually with no
well-defined low-level circulation apparent/
regular advisories not
issued/ usually corresponds to Dvorak
ratings of T1.0 or less/
MSW generally less than 25 kts
Tropical Depression -
fairly well-defined low-level circulation/
MSW 25-34 kts/ Dvorak
rating usually T1.5 - T2.0
Tropical Storm -
MSW in range of 34-63 kts/ Dvorak rating T2.5,
T3.0, or T3.5
Typhoon
-
MSW exceeding 63 kts/ Dvorak rating T4.0 or higher
SuperTyphoon
-
MSW reaching or exceeding 130 kts
Although not previously the case, in recent
years JTWC has begun
issuing regular warnings on tropical depressions when the MSW
reaches
25 kts. In earlier years the warning criterion
was the subjective
analysis that the system would likely produce tropical storm force
winds within 48 hours. TCWC = Tropical Cyclone Warning Center
MSW = Mean Surface Wind
JTWC = Joint Typhoon Warning Center
WMO = World Meteorological Organization
RSMC = Regional Specialized Meteorological Center | 
