In-flight WX encounter. Severe turbulence.

Attributes
ACN	312476
Time
Date	199508
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tul
State Reference	OK
Altitude	msl bound lower : 34300 msl bound upper : 35000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : zkc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 5000 flight time type : 1300
ASRS Report	312476
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : weather non adherence : clearance other anomaly other
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	other

Narrative:

While picking our way between cells using visual and radar we entered a cumulus cloud that did not show on our radar. We encountered severe turbulence and some icing. The speed instantly went from .75 mach cruise to .78 mach with an associated overspd clacker. The aircraft quickly lost about 700 ft with the autoplt engaged. The first officer disengaged the autoplt and returned to assigned altitude. I informed ZKC of the turbulence and altitude loss. Neither the first officer or I had seen anything on our radars to indicate that we would encounter such severe conditions.

Original NASA ASRS Text

Title: INFLT WX ENCOUNTER. SEVERE TURB.

Narrative: WHILE PICKING OUR WAY BTWN CELLS USING VISUAL AND RADAR WE ENTERED A CUMULUS CLOUD THAT DID NOT SHOW ON OUR RADAR. WE ENCOUNTERED SEVERE TURB AND SOME ICING. THE SPD INSTANTLY WENT FROM .75 MACH CRUISE TO .78 MACH WITH AN ASSOCIATED OVERSPD CLACKER. THE ACFT QUICKLY LOST ABOUT 700 FT WITH THE AUTOPLT ENGAGED. THE FO DISENGAGED THE AUTOPLT AND RETURNED TO ASSIGNED ALT. I INFORMED ZKC OF THE TURB AND ALT LOSS. NEITHER THE FO OR I HAD SEEN ANYTHING ON OUR RADARS TO INDICATE THAT WE WOULD ENCOUNTER SUCH SEVERE CONDITIONS.

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.