A B737-800 encountered orographic turbulence associated with cells they were circumnavigating. An un...

Attributes
ACN	952878
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	ZMP.ARTCC
State Reference	MN
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

Deviating north due to a thunderstorm. We were at least 20 to 25 miles north of the outer edge of a green return with smooth air to that point. I had the seat belt sign on due to areas of forecast turbulence. We had just started to enter tops of the clouds at FL380. Our radar; set at 80 mile range and -1 degree tilt; showed nothing ahead. We suddenly hit a severe updraft with moderate turbulence and gained 1;000 ft in approximately 20 seconds and then got a stick shaker at about M.74 despite maximum continuous power. After regaining stabilized flight we returned to our assigned altitude and notified ATC of the event.

Original NASA ASRS Text

Title: A B737-800 encountered orographic turbulence associated with cells they were circumnavigating. An uncommanded 1;000 FT climb and subsequent loss of airspeed triggering a stick shaker resulted before control was regained and the aircraft returned to its cleared altitude.

Narrative: Deviating north due to a thunderstorm. We were at least 20 to 25 miles north of the outer edge of a green return with smooth air to that point. I had the seat belt sign on due to areas of forecast turbulence. We had just started to enter tops of the clouds at FL380. Our radar; set at 80 mile range and -1 degree tilt; showed nothing ahead. We suddenly hit a severe updraft with moderate turbulence and gained 1;000 FT in approximately 20 seconds and then got a stick shaker at about M.74 despite maximum continuous power. After regaining stabilized flight we returned to our assigned altitude and notified ATC of the event.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-800 encountered orographic turbulence associated with cells they were circumnavigating. An uncommanded 1;000 ft climb and subsequent loss of airspeed triggering a stick shaker resulted before control was regained and the aircraft returned to its cleared altitude.