Flight crew of a B737 ballooned up 270 ft above assigned altitude due to WX buildups.

Attributes
ACN	346340
Time
Date	199608
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rdu
State Reference	NC
Altitude	msl bound lower : 10000 msl bound upper : 10270
Environment
Flight Conditions	Mixed
Aircraft 1
Controlling Facilities	tracon : rdu
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	346340
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

ATC facility: rdu approach. Location: northeast rdu. Level 10000 ft approaching rdu. Cleared to 8000 ft. While slowing to 250 KTS we were maneuvering around a small buildup. Turbulence induced aircraft to balloon to approximately 10270 ft. Descent continued and normal landing rdu. No remarks from ATC.

Original NASA ASRS Text

Title: FLC OF A B737 BALLOONED UP 270 FT ABOVE ASSIGNED ALT DUE TO WX BUILDUPS.

Narrative: ATC FACILITY: RDU APCH. LOCATION: NE RDU. LEVEL 10000 FT APCHING RDU. CLRED TO 8000 FT. WHILE SLOWING TO 250 KTS WE WERE MANEUVERING AROUND A SMALL BUILDUP. TURB INDUCED ACFT TO BALLOON TO APPROX 10270 FT. DSCNT CONTINUED AND NORMAL LNDG RDU. NO REMARKS FROM ATC.

Data retrieved from NASA's ASRS site as of July 2007 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.