Air carrier encounters severe turbulence northwest of jvl.

Attributes
ACN	457471
Time
Date	199912
Day	Sun
Local Time Of Day	0601 To 1200
Place
State Reference	WI
Altitude	msl bound lower : 17000 msl bound upper : 25000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
ASRS Report	457471
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	inflight encounter : turbulence inflight encounter : weather
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Consequence	other
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Severe turbulence encountered 80-120 NM northwest of jvl VOR. We were descending from FL250 to FL190. Airspeed was 290 KTS +/-30 KTS. Seat belt sign was on. All passenger and crew were in seats and belted in. No injuries were observed or reported. ATC was immediately advised and we continued descent to 17000 ft to get out of turbulence area. ATC had reported only light chop upon check-in. Flight plan listed 2 for turbulence index on route. Departing and arriving ATIS had no reference to en route turbulence. SIGMET for southern il and in called for moderate chop, south of our area. After landing debriefed ramp tower, dispatch and maintenance who performed severe turbulence inspection.

Original NASA ASRS Text

Title: ACR ENCOUNTERS SEVERE TURB NW OF JVL.

Narrative: SEVERE TURB ENCOUNTERED 80-120 NM NW OF JVL VOR. WE WERE DSNDING FROM FL250 TO FL190. AIRSPD WAS 290 KTS +/-30 KTS. SEAT BELT SIGN WAS ON. ALL PAX AND CREW WERE IN SEATS AND BELTED IN. NO INJURIES WERE OBSERVED OR RPTED. ATC WAS IMMEDIATELY ADVISED AND WE CONTINUED DSCNT TO 17000 FT TO GET OUT OF TURB AREA. ATC HAD RPTED ONLY LIGHT CHOP UPON CHK-IN. FLT PLAN LISTED 2 FOR TURB INDEX ON RTE. DEPARTING AND ARRIVING ATIS HAD NO REF TO ENRTE TURB. SIGMET FOR SOUTHERN IL AND IN CALLED FOR MODERATE CHOP, S OF OUR AREA. AFTER LNDG DEBRIEFED RAMP TWR, DISPATCH AND MAINT WHO PERFORMED SEVERE TURB INSPECTION.

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.