Narrative:

During a missed approach from runway 8L ILS in iah we incurred a 300 ft deviation. While on the ILS 8L the first officer initiated a missed approach as a result [of] heavy rain causing him to lose sight of the runway. To the best of my recollections runway visibility as indicated by the ATIS was 3000 RVR. However; as [a] result of the heavy rain and the fact that the wipers were stopping half way and then continuing to full movement; caused the visibility to be reduced even more. While on short final the first officer disconnected the auto pilot in preparation for landing after having the runway in sight. Following the missed approach; the autothrottle was disconnected; so the missed approach was done without autopilot and autothrottles. In addition; proper missed approach procedures were not followed resulting in many distractions during the missed approach. Immediately after the missed [approach] ATC instructed us to turn to a heading of 360. While we were turning ATC once again indicated a turn to a 360 heading; to which we replied that we were in the turn for 360 heading. Following the altitude deviation I took over the control from the first officer [and] corrected the altitude. We continued on the assigned heading and returned to runway 8L. It's obvious that the first thing that we must correct is the missed approach procedure call out and a missed approach checklist. As a result of this event we all should incorporate refreshing the missed approach call out during the approach briefing. In addition; I feel I could have taken control much earlier from the first officer to minimize or even prevent going above assigned altitude. I probably failed to recognize that the first officer was a bit overwhelmed during the missed approach.

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Original NASA ASRS Text

Title: EMB-175 flight crew reported an altitude deviation occurred during a missed approach in heavy rain.

Narrative: During a missed approach from Runway 8L ILS in IAH we incurred a 300 ft deviation. While on the ILS 8L the First Officer initiated a missed approach as a result [of] heavy rain causing him to lose sight of the runway. To the best of my recollections runway visibility as indicated by the ATIS was 3000 RVR. However; as [a] result of the heavy rain and the fact that the wipers were stopping half way and then continuing to full movement; caused the visibility to be reduced even more. While on short final the FO disconnected the auto pilot in preparation for landing after having the runway in sight. Following the missed approach; the autothrottle was disconnected; so the missed approach was done without autopilot and autothrottles. In addition; proper missed approach procedures were not followed resulting in many distractions during the missed approach. Immediately after the missed [approach] ATC instructed us to turn to a heading of 360. While we were turning ATC once again indicated a turn to a 360 heading; to which we replied that we were in the turn for 360 heading. Following the altitude deviation I took over the control from the FO [and] corrected the altitude. We continued on the assigned heading and returned to Runway 8L. It's obvious that the first thing that we must correct is the missed approach procedure call out and a missed approach checklist. As a result of this event we all should incorporate refreshing the missed approach call out during the approach briefing. In addition; I feel I could have taken control much earlier from the FO to minimize or even prevent going above assigned altitude. I probably failed to recognize that the FO was a bit overwhelmed during the missed approach.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.