Gridded average tropical cyclone metadata


Title Tropical cyclone gridded datasets


Custodian Bureau of Meteorology
Jurisdiction Australia


Abstract The grids show the average annual number of tropical cyclones over the Australian region in the form of two-dimensional array data. 
The data are based on the period 1969/70 to 2005/06. 
See LINEAGE below for more information.
Search Word(s) Gridded, analyses, tropical, cyclone, meteorology
Geographic Extent Names(s) Australia
General Category Gridded neutral, La Nina, El Nino and all years annual data
General Custodian Jurisdiction Australian Government
Geographic Extent Polygon Not applicable
Geographic Bounding Box See below
North Bounding Latitude 0.00
South Bounding Latitude -60.00
East Bounding Longitude 250.00
West Bounding Longitude 30.00

Data Currency

Beginning Date 1969/70
Ending Date 2005/06

Dataset Status

Progress Completed
Maintenance and
Update frequency


Stored Data Format Arc/InfoTM grids - all Australia
Available Format Type ASCII grid-point, Arc/InfoTM grid Interchange (.e00),Shapefiles.
Access Constraint Please note that the copyright for any data supplied by the Bureau of Meteorology is held in the Commonwealth of Australia and the purchaser shall give acknowledgement of the source in reference to the data. Apart from dealings under the Copyright Act 1968, the purchaser shall not reproduce (electronically or otherwise), modify or supply (by sale or otherwise) these data without written permission from the supplier.  Please contact us (see details below) for more information.

Data Quality

Lineage The southern hemisphere tropical cyclone (TC) archive consists of cyclone best track data for the TC seasons from 1969/70 to 2005/06. The creation of a reasonably complete 30-year dataset for the whole Southern Hemisphere provided the basis for the generation of a set of climatological data sets showing the frequency of TC occurrence. 
A number of quality control/validation procedures were applied as part of the TC archive generation process. For example, the data was cross-checked with TC archive data from the Joint Typhoon Warning Centre, Hawaii, USA. We believe that the 1969/70 to 2005/06 TC archive accurately represents cyclone best track data in the Southern Hemisphere. 
For the 30-year period corresponding to the 1969/70 to 2005/06 TC seasons, cyclone tracks were analysed across the southern hemisphere at a resolution of 2° x 2°. The number of occurrences of cyclones in each 2°x2° square was then calculated and the data converted to two-dimensional gridded format. 
The derived gridded information shows the average annual occurrence of tropical cyclones as well as the average annual cyclone occurrence during El Niño, La Niña and neutral years. Note, El Niño, La Niña years were taken from Wright (2001). 
The calculation of cyclone occurrence in this study was similar to the analysis done by Lourensz (1981) which was based on 5° lat/long squares. However, these gridded data sets show annual occurrence rather than decadal incidence information, and a finer rectangular resolution was used in this analysis (2° lat/long squares). 
Lourensz, R.S. 1981. Tropical cyclones in the Australian region July 1909 to June 1980. Australian Government Publishing Service, Canberra, 94 pp. 
Wright, W.J, 2001: A review of Australian climate in the 20th Century. Preprints, CLI-MANAGE 2000 (Conference on Managing Australian Climate Variability), Albury, NSW, Australia, Bureau of Meteorology, 127-130.
Positional Accuracy The observational (station) data on which the analyses were based have an associated accuracy of the order of 0.01 degrees (approximately 1km) or better.
Attribute Accuracy Grid point data are post-processed. 
For more information (metadata) on observing stations please contact us.
Logical Consistency Not applicable
Completeness No missing data

Contact Information

Contact Organisation Bureau of Meteorology
Contact Position Climate Data Services
Mail Address PO BOX 1289, Melbourne 3001, Australia
State Victoria
Country Australia
Postcode 3001
Telephone (03) 9669 4082
Facsimile (03) 9669 4515
Electronic Mail

Metadata date

Metadata date 2009
Additional Metadata Additional information available on request (see contact above).
Page updated: 3 October 2011