First thing that you need to do is find a good vantage point to observe the storm. Ideally this is a covered area such as a parking deck. You will also need a tripod and ideally a locking cable release.
Now all you have to do is setup the camera on a tripod and determine the exposure for the scene. If the scene has very little ambient light then just leave that camera in bulb and use the locking cable release to lock the shutter open. Now all you have to do is wait for a lightning bolt or two to enter into your scene. This requires a little luck, but you can also setup some lightning rods if you are in an area where that is possible.
Now if the scene has a lot of ambient light then you will have to meter the scene and determine the exposure time. You can lengthen the amount of time by using a smaller aperture. Just be sure to dont overexpose your image otherwise the lighting bolts will not show up clearly.
Just remember that lightning storms are unpredictable so be sure to take the proper safety precautions.
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Rex K
The view from my "office" doesn't suck. 
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