B737 captain reported severe turbulence during approach.

Attributes
ACN	1607115
Time
Date	201812
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 399
Events
Anomaly	Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

Descending into ZZZ; encountered severe turbulence around 11;000 feet. Aircraft was out of control for approximately 10-15 seconds. A very challenging approach then followed with winds 210 at 23 gust 36 knots. Automation was unable to keep up with conditions. Transfer of controls from first officer to captain occurred around 1500 feet AGL. Approach was stabilized with a normal landing. Neither the first officer nor [I] felt that it would be safe to continue our flight; so subsequent fatigue calls were made after all appropriate actions on the ground were complied with.

Original NASA ASRS Text

Title: B737 Captain reported severe turbulence during approach.

Narrative: Descending into ZZZ; encountered severe turbulence around 11;000 feet. Aircraft was out of control for approximately 10-15 seconds. A very challenging approach then followed with winds 210 at 23 gust 36 knots. Automation was unable to keep up with conditions. Transfer of controls from First Officer to Captain occurred around 1500 feet AGL. Approach was stabilized with a normal landing. Neither the First Officer nor [I] felt that it would be safe to continue our flight; so subsequent fatigue calls were made after all appropriate actions on the ground were complied with.

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.