Please see the attachment.

The paper studies the impact of GNSS data assimilation over Italy with a focus on a 6-hour forecast based on precipitable water vapor and precipitation. It is evident from the study that GNSS DA improves the underestimation of water vapor by WRF.

I mostly agree with the points mentioned by Referee #1, however, I think that reframing the aim of the paper and adding some additional analysis that could bring some novelty to the paper. From the reply comments of the author to the reviewer, I see the author has already started to prepare results in the direction of data thinning experiments which is good.

 My major concern to add is that the data assimilation experiments need some more elaboration:

• regarding the observations assimilated in the BCKG experiment.
• regarding the GNSS data used for assimilation and if bias correction was performed before the assimilation of GNSS data.

My minor concern to add is about the tense usage in the text throughout the journal should be uniform. Also, the paragraph construction should be more refined regarding the main point to express in a context.