This picture shows at the upper right a dark raining cloud:
Copyright and Photograph: AFP/Getty/Indonesian SAR
Link:
Downdraft theory in Lion Air crash | World news | guardian.co.uk
And the Guardian reported:
"According to the Flight Safety Foundation, bulletins for pilots at around that time indicated a few storm clouds at 518 metres (1,700ft) and a wind blowing moderately but varying in its direction from east-south-east to the west. "
WADD 130730Z 15006KT 110V270 9999 FEW017CB SCT017 30/25 Q1007 NOSIG
WADD 130700Z 09006KT 9999 BKN017 30/26 Q1007 NOSIG
WADD 130630Z 16003KT 090V190 9999 BKN017 30/25 Q1007 NOSIG