DC8F aircraft in cruise encountered severe WX with updrafts, downdrafts, and lightning. Aircraft gained and lost altitude before flight crew could return to assigned altitude.

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Attributes
ACN	370440
Time
Date	199706
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : zmp
State Reference	MN
Altitude	msl bound lower : 36000 msl bound upper : 37500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp tower : dtw
Operator	common carrier : air carrier
Make Model Name	DC-8 60
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
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 : 10500 flight time type : 3000
ASRS Report	370440
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 other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Just leveling at FL370 IMC continuous light to moderate chop. No cells or precipitation on radar. Suddenly lightning, moderate to severe turbulence, heavy rain. Altitude ballooned to 37500 ft tried to recover when downdraft took us to 36000 ft. Advised ZMP deviated north. After recovery made PIREP and confirmed with ZMP (134.80) no conflict had occurred.

Original NASA ASRS Text

Title: DC8F ACFT IN CRUISE ENCOUNTERED SEVERE WX WITH UPDRAFTS, DOWNDRAFTS, AND LIGHTNING. ACFT GAINED AND LOST ALT BEFORE FLC COULD RETURN TO ASSIGNED ALT.

Narrative: JUST LEVELING AT FL370 IMC CONTINUOUS LIGHT TO MODERATE CHOP. NO CELLS OR PRECIPITATION ON RADAR. SUDDENLY LIGHTNING, MODERATE TO SEVERE TURB, HVY RAIN. ALT BALLOONED TO 37500 FT TRIED TO RECOVER WHEN DOWNDRAFT TOOK US TO 36000 FT. ADVISED ZMP DEVIATED N. AFTER RECOVERY MADE PIREP AND CONFIRMED WITH ZMP (134.80) NO CONFLICT HAD OCCURRED.

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.