B757 encountered severe turbulence while climbing in the vicinity of thunderstorms over mountainous ...

Attributes
ACN	757391
Time
Date	200710
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zdv.artcc
State Reference	CO
Altitude	msl single value : 28500
Environment
Weather Elements	Thunderstorm Turbulence
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 3000
ASRS Report	757391
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 230 flight time total : 7000 flight time type : 1300
ASRS Report	757386
Events
Anomaly	inflight encounter : weather inflight encounter other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment
Supplementary
Problem Areas	ATC Human Performance Weather
Primary Problem	Weather

Narrative:

We departed denver wbound; first officer's leg. Typical light chop on climb out toward the front range. Broken layer of clouds from 7000-9000 ft. Over the front range; various buildups were observed. We were given radar vectors to avoid a major buildup south of us. At approximately FL275; climbing to FL380; we experienced intermittent moderate chop. ATC advised us that moderate chop was reported from FL285-FL330. We were in and out of clouds; and there were no significant returns on radar in front of us. At FL280-FL330 we experienced severe turbulence. We were unable to maintain wings level and experienced short vertical up and down deviations of 1000 ft or more from our normal vertical climb. We cleared the tops at FL320. During the vertical speed excursions; we experienced significant pressure against our seatbelts. First officer was able to maintain airspeed of around 280 KTS the entire time. The flight attendants were told to remain in their seats during the pre-departure briefing until we called. No injuries were reported by flight attendants or passenger. We notified ATC; dispatch; and maintenance.

Original NASA ASRS Text

Title: B757 ENCOUNTERED SEVERE TURB WHILE CLIMBING IN THE VICINITY OF TSTMS OVER MOUNTAINOUS TERRAIN.

Narrative: WE DEPARTED DENVER WBOUND; FO'S LEG. TYPICAL LIGHT CHOP ON CLBOUT TOWARD THE FRONT RANGE. BROKEN LAYER OF CLOUDS FROM 7000-9000 FT. OVER THE FRONT RANGE; VARIOUS BUILDUPS WERE OBSERVED. WE WERE GIVEN RADAR VECTORS TO AVOID A MAJOR BUILDUP S OF US. AT APPROX FL275; CLBING TO FL380; WE EXPERIENCED INTERMITTENT MODERATE CHOP. ATC ADVISED US THAT MODERATE CHOP WAS REPORTED FROM FL285-FL330. WE WERE IN AND OUT OF CLOUDS; AND THERE WERE NO SIGNIFICANT RETURNS ON RADAR IN FRONT OF US. AT FL280-FL330 WE EXPERIENCED SEVERE TURB. WE WERE UNABLE TO MAINTAIN WINGS LEVEL AND EXPERIENCED SHORT VERT UP AND DOWN DEVS OF 1000 FT OR MORE FROM OUR NORMAL VERT CLB. WE CLRED THE TOPS AT FL320. DURING THE VERT SPD EXCURSIONS; WE EXPERIENCED SIGNIFICANT PRESSURE AGAINST OUR SEATBELTS. FO WAS ABLE TO MAINTAIN AIRSPD OF AROUND 280 KTS THE ENTIRE TIME. THE FLT ATTENDANTS WERE TOLD TO REMAIN IN THEIR SEATS DURING THE PRE-DEP BRIEFING UNTIL WE CALLED. NO INJURIES WERE REPORTED BY FLT ATTENDANTS OR PAX. WE NOTIFIED ATC; DISPATCH; AND MAINT.

Data retrieved from NASA's ASRS site as of January 2009 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.

B757 encountered severe turbulence while climbing in the vicinity of thunderstorms over mountainous terrain.