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Welcome to the Northwest 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 ---
Super-Typhoons of 2008 (click to
enlarge)
 Downloadable
Northwest Pacific Tracking Map
Downloadable
Philippines Area Tracking Map
Tropical Cyclone History
by year and month 1945 to present
From the Joint Typhoon Warning
Center
REGION 13
- FAQ--
NORTHWEST PACIFIC OCEAN
Areal coverage - area north of
0° and between 180°E and the east coasts
of China, Southeast Asia area, including Japan and the Philippines.
Names
| Contributor |
I |
II |
III |
IV |
V |
| Cambodia |
Damrey |
Kong-rey |
Nakri |
Krovanh |
Sarika |
| China |
Longwang |
Yutu |
Fengshen |
Dujuan |
Haima |
| DPR Korea |
Kirogi |
Toraji |
Kalmaegi |
Maemi |
Meari |
| HK,
China |
Kai-Tak |
Man-yi |
Fung-wong |
Choi-wan |
Ma-on |
| Japan |
Tembin |
Usagi |
Kanmuri |
Koppu |
Tokage |
| Lao
PDR |
Bolaven |
Pabuk |
Phanfone |
Ketsana |
Nock-Ten |
|
Macau |
Chanchu |
Wutip |
Vongfong |
Parma |
Muifa |
|
Malaysia |
Jelawat |
Sepat |
Rusa |
Melor |
Merbok |
|
Micronesia |
Ewiniar |
Fitow |
Sinlaku |
Nepartak |
Nanmadol |
|
Philippines |
Bilis |
Danas |
Hagupit |
Lupit |
Talas |
|
RO Korea |
Gaemi |
Nari |
Changmi |
Sudal |
Noru |
|
Thailand |
Prapiroon |
Vipa |
Megkhla |
Nida |
Kularb |
|
U.S.A. |
Maria |
Francisco |
Higos |
Omais |
Roke |
|
Vietnam |
Saomai |
Lekima |
Bavi |
Conson |
Sonca |
|
Cambodia |
Bopha |
Krosa |
Maysak |
Chanthu |
Nesat |
|
China |
Wukong |
Haiyan |
Haishen |
Dianmu |
Haitang |
|
DPR Korea |
Sonamu |
Podul |
Pongsona |
Mindule |
Nalgae |
|
HK,
China |
Shanshan |
Lingling |
Yanyan |
Tingting |
Banyan |
|
Japan |
Yagi |
Kaziki |
Kuzira |
Kompasu |
Washi |
|
Lao
PDR |
Xangsane |
Faxai |
Chan-hom |
Namtheun |
Matsa |
|
Macau |
Bebinca |
Vamei |
Linfa |
Malou |
Sanvu |
|
Malaysia |
Rumbia |
Tapah |
Nangka |
Meranti |
Mawar |
|
Micronesia |
Soulik |
Mitag |
Soudelor |
Rananin |
Guchol |
|
Philippines |
Cimaron |
Hagibis |
Imbudo |
Malakas |
Talim |
|
RO Korea |
Chebi |
Noguri |
Koni |
Megi |
Nabi |
|
Thailand |
Durian |
Ramasoon |
Hanuman |
Chaba |
Khanun |
|
U.S.A. |
Utor |
Chataan |
Etau |
Kodo |
Vicete |
|
Vietnam |
Trami |
Halong |
Vamco |
Songda |
Saola |
Season -
June through November Average number
of tropical cyclones in a year -- 27.88
Average number of tropical cyclones in a
"normal season" --
23.45
Most active month --
August - average
5.50 storms/year
Most active period --
July through November -
84.11% of all storms
Most storms in a single season -
43 in 1996
Fewest storms in a single season --
15 in 1946 The graphs below have been created using the "best
track" data from 1945 to 2000 courtesy of JTWC. Click on the graph to enlarge.
| Tropical Cyclones by Year |
Tropical Cyclones by Month |
Tropical Cyclone Probability by Month |
Tropical Cyclone Frequency Per Month |
|
 |
 |
 |
 |
This is for JMA (Japan Meteorological Service) Cyclone rating designation process -- MSW Averaging Period: 10 minutes
Tropical Cyclone - generic term is used for
all tropical weather
disturbances
Low Pressure Area - distinct area of
disturbed weather but
usually with no well-defined low-level circulation apparent/
regular advisories not issued
Tropical Depression - fairly
well-defined low-level circulation/
MSW less than 34 kts
Tropical Storm -
MSW in range of 34-47 kts/ Dvorak rating T2.5
or T3.0
Severe Tropical Storm -
MSW in range of 48-63 kts/ Dvorak rating
T3.5 or T4.0
Hurricane -
MSW exceeding 63 kts/ Dvorak rating T4.5 or higher
The Japanese Meteorological Agency (JMA) is the
WMO's official RSMC for the Northwest Pacific Basin. While
adhering to a 10-min averaging period for MSW, JMA normally equates 34 kts to a Dvorak rating of T2.5; thus, JMA and JTWC agree in principle on the threshold of tropical storm intensity. However, for very intense typhoons, JMA's MSW estimates are usually far below those assigned by JTWC. Other Asian nations' weather services issue tropical cyclone warnings for portions of the Northwest Pacific region,
including the Philippines, Hong Kong, China, Vietnam, Taiwan, and
Korea. Warnings from these weather services are issued independently
of JMA but utilize the same terminology and are usually reasonably
close to JMA's positions and intensity estimates.
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 Annual Tropical Cyclone Reports
from JTWC
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