B737-800 flight crew reported speed and altitude deviations during a go-around.

Attributes
ACN	1542765
Time
Date	201805
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Deviation - Altitude Overshoot Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence

Narrative:

Inbound on [the ILS]. First officer (first officer) flying. Thunderstorm encroaching airfield from the west. Just after the final approach fix; the aircraft ahead of us went missed approach for an aircraft windshear alert. Same time we lost sight of the runway as a line of rain covered it. We went around as well; bringing flaps to 15 and gear up. Was difficult to reach tower as they were giving instructions to the aircraft ahead. Very bumpy climb and initially assigned runway heading despite having planned with tower a right turn to avoid weather.in the confusion; the autothrottles were disconnected instead of the toga button being pressed. This led to lack of directional and speed guidance for the pilot flying; and the flaps were left at 15 until 210 knots; an overspeed. We cleaned up the aircraft; recognized the error and reduced power. We had drifted above the 5;000 feet assigned; and as we started back down were assigned 6;000 feet. Complied with ATC instructions and entered holding.in trying to avoid the worst of the storm and avoid the slower aircraft ahead (needed ATC guidance); along with unexpected aircraft response (I didn't realize initially we weren't in go around mode); we didn't prioritize the clean-up of the aircraft. Focus on that; then clean up; without automation led to us drifting above assigned altitude.

Original NASA ASRS Text

Title: B737-800 flight crew reported speed and altitude deviations during a go-around.

Narrative: Inbound on [the ILS]. FO (First Officer) flying. Thunderstorm encroaching airfield from the west. Just after the final approach fix; the aircraft ahead of us went missed approach for an aircraft windshear alert. Same time we lost sight of the runway as a line of rain covered it. We went around as well; bringing flaps to 15 and gear up. Was difficult to reach Tower as they were giving instructions to the aircraft ahead. Very bumpy climb and initially assigned runway heading despite having planned with Tower a right turn to avoid weather.In the confusion; the autothrottles were disconnected instead of the TOGA button being pressed. This led to lack of directional and speed guidance for the pilot flying; and the flaps were left at 15 until 210 knots; an overspeed. We cleaned up the aircraft; recognized the error and reduced power. We had drifted above the 5;000 feet assigned; and as we started back down were assigned 6;000 feet. Complied with ATC instructions and entered holding.In trying to avoid the worst of the storm and avoid the slower aircraft ahead (needed ATC guidance); along with unexpected aircraft response (I didn't realize initially we weren't in go around mode); we didn't prioritize the clean-up of the aircraft. Focus on that; then clean up; without automation led to us drifting above assigned altitude.

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.