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HOME > iTacs (Interactive Tool for Analysis of the Climate System)

iTacs (Interactive Tool for Analysis of the Climate System)

Maintenance schedule


iTacs version 5.0


Datasets and Elements

Tutorial Manual

What is iTacs?

iTacs stands for Interactive Tool for Analysis of the Climate System. It is a web-based application developed by the Japan Meteorological Agency (JMA) to assist National Meteorological and Hydrological Services (NMHSs) in their production of analysis information on extreme climate events and their climate status monitoring. It can be accessed via a web browsers without the need for additional software or plug-ins.

Various types of charts are available.

2D map

Time-longitude cross section

Time series graph

The application features various types of statistical evaluation, including EOF analysis and correlation analysis.

EOF analysis

Correlation analysis

Data provided

See list of datasets and elements available on iTacs for details.

Analysis Dataset
Forecast Dataset

Web browser

Major web browsers (e.g., Microsoft Internet Explorer, Mozilla Firefox, Apple Safari, Google Chrome) are recommended for iTacs usage. Plug-ins such as Adobe Flash Player or Microsoft Silverlight are not required.

Requests for iTacs access

Please read the Conditions of Use outlined below before submitting a request for iTacs access to JMA. All requests will be screened, and an ID and password will be issued for those that are approved. Staff at National Meteorological and Hydrological Services are eligible to use iTacs.

Request submission

Please email the information below with "Request for iTacs access" as the subject. A reply with further information mail will be sent to the e-mail address provided within a few days.

Conditions of Use

Although JMA has taken the utmost care in developing the functions of iTacs, it assumes no responsibility regarding the system's reliability or for any damage that may result from its use. JMA reserves the right to change or delete information on this site without prior notice, and accepts no responsibility for any inconvenience that may result from such changes or deletion.


Tokyo Climate Center, Climate Prediction Division.
Copyright(C) 2002. Japan Meteorological Agency. - Legal Notice -