From the wiki article,
The investigation concluded that the engines had failed "as a result of an inflight encounter with an area of very heavy rain and hail. A contributing cause of the incident was the inadequate design of the engines and that the FAA's water ingestion certification standards did not reflect the waterfall rates that can be expected in moderate or higher intensity thunderstorms."
[2]
Thanks HP Bleed, They actually selected ignition on prior to entering by the sounds of it. It also seems that it was pretty severe TS with hail and probably heavy rain.
Any more examples anyone?
please feel free to use google.
Thanks Captain Bleed