Terms and Conditions


SwirlsPy (the “Software”) is developed to facilitate knowledge exchange and cooperation on development of rainfall nowcasting technique. It may be used by National Meteorological and Hydrological Services (NHMSs) upon request. To request or for any enquiry, please send an e-mail to <swirls@hko.gov.hk>.


  • The Software shall not be partially or totally transferred to a third party;
  • The Software or its derived products shall not be used for commercial purpose; and
  • Due acknowledgement to the HKO shall be given in papers and reports containing results made or derived from the application or use of the Software.


Hong Kong Observatory (HKO) and the Government of the Hong Kong Special Administrative Region (HKSARG) (including its servants and agents), make no warranty, statement or representation, express or implied, with respect to the accuracy, availability, completeness or usefulness of the information, contained herein, and in so far as permitted by law, shall not have any legal liability or responsibility (including liability for negligence) for any loss, damage, or injury (including death) which may result, whether directly or indirectly, from the supply or use of the Software.