B737 ng flight crew reported severe turbulence on descent.

Attributes
ACN	1701840
Time
Date	201911
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 8000
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

While flying over ZZZ VOR and joining the zzzzz arrival into ZZZ; we encountered severe turbulence while descending through flight levels 320-290. The event lasted approximately 2 mins and we exceeded the mach limit for the aircraft. The seat belt sign was on and the captain had given the flight attendant's (flight attendants) a PA to take their seats approximately 2 minutes before the event based on a 'bumpy' ride report on descent from ATC. Upon entering the turbulence; the autopilot disconnected and we experienced +/- 1500 fpm on the vsi; +/- 60 kts. Of airspeed and 25 degree rolls left and right. No injuries were reported by any of the passengers; however a couple of our flight attendant may have strained their backs or necks trying to get their service carts stowed and into their seats. We believe that we encountered a severe wind shear as we had a 131 kts tailwind when we began our descent and when we finally came out of the turbulence it was a 50 kts crosswind. A company aircraft joining the same arrival behind us experienced a similar event about 30-45 seconds after us.

Original NASA ASRS Text

Title: B737 NG flight crew reported severe turbulence on descent.

Narrative: While flying over ZZZ VOR and joining the ZZZZZ arrival into ZZZ; we encountered severe turbulence while descending through flight levels 320-290. The event lasted approximately 2 mins and we exceeded the Mach limit for the aircraft. The seat belt sign was on and the Captain had given the FA's (Flight Attendants) a PA to take their seats approximately 2 minutes before the event based on a 'bumpy' ride report on descent from ATC. Upon entering the turbulence; the autopilot disconnected and we experienced +/- 1500 fpm on the VSI; +/- 60 kts. of airspeed and 25 degree rolls left and right. No injuries were reported by any of the passengers; however a couple of our FA may have strained their backs or necks trying to get their service carts stowed and into their seats. We believe that we encountered a severe wind shear as we had a 131 kts tailwind when we began our descent and when we finally came out of the turbulence it was a 50 kts crosswind. A company aircraft joining the same arrival behind us experienced a similar event about 30-45 seconds after us.

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.