BULB feature and a remote...... I have been taking lightning pics for the past couple of years with different cameras, even point and shoot using 6 to 10 second exposure (2 second delay to keep from shaking the camera) and just hoping that you catch a strike...... The best results are from having a remote and using BULB if your camera has it, keep shutter open until there is a strike then shut it..

You will need to play with it a bit....20 seconds to 40 seconds works best....and play with the f stop and ISO on a few shots to adjust for the lighting in the area....I think this was f5.6/ISO 100 because of all the lights around.
Of course take in to consideration that you will be standing next to an aluminum tripod in a lightning storm......my wife is never really happy about me doing this.