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North Indian Ocean Best Track Data

Click on a year link in the left-hand column to view or download Best Track data files for Northern Indian Ocean tropical cyclones for that year. Note that the Northern Indian Ocean covers both the Bay of Bengal and Arabian Sea basins. Data are available as individual storm text files and yearly compressed files (zip format).

Note: 1945-1970 data files have not been reviewed or updated for y2k and there are no storm or year notes for those years.

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    Northern Indian Ocean
     1945 IO zip
     1946 IO zip
     1947 IO zip
     1948 IO zip
     1949 IO zip
     1950 IO zip
     1951 IO zip
     1952 IO zip
     1953 IO zip
     1954 IO zip
     1955 IO zip
     1956 IO zip
     1957 IO zip
     1958 IO zip
     1959 IO zip
     1960 IO zip
     1961 IO zip
     1962 IO zip
     1963 IO zip
     1964 IO zip
     1965 IO zip
     1966 IO zip
     1967 IO zip
     1968 IO zip
     1969 IO zip
     1970 IO zip
     1971 IO zip
     1972 IO zip
     1973 IO zip
     1974 IO zip
     1975 IO zip
     1976 IO zip
     1977 IO zip KML
     1978 IO zip KML
     1979 IO zip KML
     1980 IO zip KML
     1981 IO zip KML
     1982 IO zip KML
     1983 IO zip KML
     1984 IO zip KML
     1985 IO zip KML
     1986 IO zip KML
     1987 IO zip KML
     1988 IO zip KML
     1989 IO zip KML
     1990 IO zip KML
     1991 IO zip KML
     1992 IO zip KML
     1993 IO zip KML
     1994 IO zip KML
     1995 IO zip KML
     1996 IO zip KML
     1997 IO zip KML
     1998 IO zip KML
     1999 IO zip KML
     2000 IO zip KML
     2001 IO zip KML
     2002 IO zip KML
     2003 IO zip KML
     2004 IO zip KML
     2005 IO zip KML
     2006 IO zip KML
     2007 IO zip KML
     2008 IO zip KML
     2009 IO zip KML
     2010 IO zip KML
     2011 IO zip KML
     2012 IO zip KML
     2013 IO zip KML
     2014 IO zip KML
     2015 IO zip KML
    Southern Hemisphere
    Western North Pacific
 
  
 
Last updated: 14 Jun 2016

Individual Best Track File Name Breakdown (examples):
bio011985.txt
bsh011985.txt
bwp011985.txt
wp_storm_notes_1985.txt
wp_year_notes_1985.txt
1985s-bwp- full.zip
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Best-track-Indian-Ocean-01-Storm-1945.Text-format
Best-track-Southern-Hemisphere-01-Storm- 1945.Text-format
Best-track-Western-Pacific-01-Storm- 1945.Text-format
Western North Pacific Storm Notes
Western North Pacific Yearly Notes
Zip file of all 1985 Western North Pacific Best Tracks and
storm/year notes

Western North Pacific Best Track Data Format
  BASIN,CY, YYYYMMDDHH,TECHNUM, TECH,TAU, LatN/S,LonE/W, VMAX,MSLP,
TY,RAD, WINDCODE,RAD1, RAD2,RAD3, RAD4,RADP, RRP,MRD, GUSTS,EYE,
SUBREGION,MAXSEAS, INITIALS,DIR, SPEED,STORMNAME, DEPTH,SEAS,
SEASCODE,SEAS1, SEAS2,SEAS3, SEAS4

BASIN - basin, e.g. WP, IO, SH, CP, EP, AL
CY - annual cyclone number: 1 through 99
YYYYMMDDHH - Warning Date-Time-Group: 0000010100 through 9999123123. (note, 4 digit year)
TECHNUM - objective technique sorting number: 00 - 99
TECH - acronym for each objective technique or CARQ or WRNG, BEST for best track.
TAU - forecast period: -24 through 120 hours, 0 for best-track, negative taus used for CARQ and WRNG records.
LatN/S - Latitude (tenths of degrees) for the DTG: 0 through 900, N/S is the hemispheric index.
LonE/W - Longitude (tenths of degrees) for the DTG: 0 through 1800, E/W is the hemispheric index.
VMAX - Maximum sustained wind speed in knots: 0 through 300.
MSLP - Minimum sea level pressure, 1 through 1100 MB.
TY - Level of tc development:
TD - tropical depression,
TS - tropical storm,
TY - typhoon,
ST - super typhoon,
TC - tropical cyclone,
HU - hurricane,
SD - subtropical depression,
SS - subtropical storm,
EX - extratropical systems,
MD - monsoon depression,
IN - inland,
DS - dissipating,
LO - low,
WV - tropical wave,
ET - extrapolated,
XX - unknown.

RAD - Wind intensity (kts) for the radii defined in this record: 35, 50, 65 or 100.
WINDCODE - Radius code:

AAA - full circle
NNS - north semicircle
NES - northeast semicircle
EES - east semicircle
SES - southeast semicircle
SSS - south semicircle
SWS - southwest semicircle
WWS - west semicircle
NWS - northwest semicirlce
QQQ - quadrant (NNQ, NEQ, EEQ, SEQ, SSQ, SWQ, WWQ, NWQ)

RAD1 - If full circle, radius of specified wind intensity, If semicircle or quadrant, radius
of specified wind intensity of circle portion specified in radius code. 0 - 1200 nm.
RAD2 - If full circle this field not used, If semicicle, radius (nm) of specified wind intensity
for semicircle not specified in radius code, If quadrant, radius (nm) of specified wind intensity
for 2nd quadrant (counting clockwise from quadrant specified in radius code). 0 through 1200 nm.
RAD3 - If full circle or semicircle this field not used, If quadrant, radius (nm) of specified wind
intensity for 3rd quadrant (counting clockwise from quadrant specified in radius code). 0 through 1200 nm.
RAD4 - If full circle or semicircle this field not used, If quadrant, radius (nm) of specified wind
intensity for 4th quadrant (counting clockwise from quadrant specified in radius code). 0 through 1200 nm.
RADP - pressure in millibars of the last closed isobar, 900 - 1050 mb.
RRP - radius of the last closed isobar in nm, 0 - 9999 nm.
MRD - radius of max winds, 0 - 999 nm.
GUSTS - gusts, 0 through 995 kts.
EYE - eye diameter, 0 through 999 nm.
SUBREGION - subregion code: W, A, B, S, P, C, E, L.

A - Arabian Sea
B - Bay of Bengal
C - Central Pacific
E - Eastern Pacific
L - Atlantic
P - South Pacific (135E - 120W)
S - South IO (20E - 135E)
W - Western Pacific

MAXSEAS - max seas: 0 through 999 ft.
INITIALS - Forecaster's initials, used for tau 0 WRNG, up to 3 chars.
DIR - storm direction, 0 - 359 degrees.
SPEED - storm speed, 0 - 999 kts.
STORMNAME - literal storm name, NONAME or INVEST. TCcyx used pre-1999, where:

cy = Annual cyclone number 01 through 99
x = Subregion code: W, A, B, S, P, C, E, L.

A - Arabian Sea
B - Bay of Bengal
C - Central Pacific
E - Eastern Pacific
L - Atlantic
P - South Pacific (135E - 120W)
S - South IO (20E - 135E)
W - Western Pacific

DEPTH - system depth, D-deep, M-medium, S-shallow, X-unknown
SEAS - Wave height for radii defined in SEAS1-SEAS4, 0-99 ft.
SEASCODE - Radius code:

AAA - full circle
NNS - north semicircle
NES - northeast semicircle
EES - east semicircle
SES - southeast semicircle
SSS - south semicircle
SWS - southwest semicircle
WWS - west semicircle
NWS - northwest semicircle
QQQ - quadrant (NNQ, NEQ, EEQ, SEQ, SSQ, SWQ, WWQ, NWQ)
SEAS1 - first quadrant seas radius as defined by SEASCODE, 0 through 999 nm.
SEAS2 - second quadrant seas radius as defined by SEASCODE, 0 through 999 nm.
SEAS3 - third quadrant seas radius as defined by SEASCODE, 0 through 999 nm.
SEAS4 - fourth quadrant seas radius as defined by SEASCODE, 0 through 999 nm.

Fields currently used for best track records:
BASIN, CY, YYYYMMDDHH, , TECH, TAU, LatN/S, LonE/W, VMAX, MSLP, TY
TECH = BEST
TAU = 0

All fields are used for objective-aids history records (CARQ,WRNG,COMS):
TECHNUM = 01 - CARQ and COMS, 00 - WRNG
TECH = CARQ, WRNG, COMS
INITIALS for WRNG/OFCL record
Repeated for tau -24 through tau 0

Fields for objective-aids forecasts records:
BASIN, CY, YYYYMMDDHH, TECHNUM, TECH, TAU, LatN/S, LonE/W, VMAX, MSLP, TY, RAD, WINDCODE, RAD1, RAD2, RAD3, RAD4
Repeated for tau 0 through tau 120
Wind records merged in from existing r-decks will be assigned a TECH of CNTR. Wind records created during normal use of the combined abr-deck will be assigned the TECH corresponding to the center name as defined in $ATCFINC/atcfsite.nam.
This review is the result of a coordinated effort between Naval Research Lab, Monterey and JTWC.
Persons involved are Dr. J H. Chu, Mr. A. Levine, Mr. S. Daida, Capt. D. Schiber, Mr. E. Fukada, Mr. C. R. Sampson.