I would like to thank the two reviewers for their helpful and constructive recommendations, and the authors for their detailed response.

The reviews were quite positive and agreed that the manuscript is of interest to HESS readership. The reviewers made a number of valuable suggestions, including clarification of the procedure and model, consistent terminology, visualisation of results, comparison with existing models, and some additional experiments.

I find that the authors’ proposed changes are sensible and would like to invite the authors to submit a revised manuscript.

Sincerely,
Louise Slater

We have now received two re-reviews from the same referees.

The two referees agree the significance and quality of the manuscript is good, but they both suggest some important further clarifications and revisions.

The referees’ suggestions are quite reasonable, and so I would like to invite the authors to consider these suggestions carefully and submit a revised manuscript.

Sincerely,
Louise Slater

Dear Authors,

Thank you for submitting a revised manuscript and responses to the reviewers. I find that many of the suggestions are well addressed, but a few additional clarifications would be helpful.

The first reviewer suggested providing a comparison with operational moisture tracking models, such as Hysplit. You state that “these models have a number of different assumptions (and data input) and any comparison would fall outside our study set-up”. I would recommend, at the very least, introducing the existing operational models in the manuscript, clarifying the differences, and/or explaining how a comparison could be drawn.

I also agree with the same reviewer that the title should more accurately reflect the content of the manuscript.

Finally, I would also suggest providing some details about the publicly-available code (such as the language) in the manuscript. Regarding the Github repository: I cannot see any documentation (such as a readme file), and would recommend providing some guidance for those who may wish to use your code. For information: I noticed there are (several!) other software/platforms available online that are also called “UTrack”, and so you may wish to slightly alter the name of the software (and URL) before the manuscript is published.

I look forward to accepting the manuscript once these issues have been addressed.

Sincerely,
Louise Slater

Dear Authors,
I am delighted to accept your manuscript.
Best wishes,
Louise Slater