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iTacs (Interactive Tool for Analysis of the Climate System)

Maintenance schedule

• 6 March 2026 - iTacs5 has been discontinued and iTacs6 has been released instead.

Announcement

• 6 March 2026 - iTacs6 has been released to replace iTacs5. iTacs6's functions will be limited at first. Full functionality of iTacs6 is expected to be restored in mid‑2026.

iTacs version 6.0

Tools

• iTacs v6.0
  

Datasets and Elements

In preparation

Tutorial Manual

In preparation

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.

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 provided for those that are approved. Staff at National Meteorological and Hydrological Services (NMHSs) 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.

• 1.Name (first/last):
• 2.Affiliation (e.g., Climate Prediction Division, Japan Meteorological Agency):
• 3.Address of organization of affiliation:
• 4.E-mail address:
• 5.Purpose of use (Requests simply stating "study" or "research" will not be approved.):

Conditions of Use

• 1.Users must provide the information requested, including their name, affiliation, e-mail address and purpose of data use.
• 2.The use of iTacs figures and/or data for commercial purposes is prohibited.
• 3.Users must not let any third party use the ID/password issued, and must keep this information private at all times.
• 4.The use of iTacs should be duly acknowledged in scientific or technical papers, publications, press releases and other communications.

Sample of citation: The figures and statistical analysis in this study were based on iTacs data provided by the Japan Meteorological Agency.

• 5.The data source used for iTacs must be referenced and acknowledged if necessary in scientific or technical papers, publications, press releases and other communications.
• 6.Users must provide JMA with a copy of any scientific or technical papers, publications, press releases and other communications whose production involved the use of iTacs.
• 7.Please avoid improper use, such as placing excessive load on the server.

Disclaimer

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.

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