Good day all,
Chasing is OK at night but as long as SAFETY is taken into utmost account!
This is not only knowing WHERE tou are RELATIVE to a dangerous part of the storm (such as tornadoes, wall clouds, hail shafts, etc) but also consider that some other aspects can catch you by suprise (such as flash floods)!
I do not recommend it, but chasing at night can be done in a relatively safe manner, but id more "difficult" than day chasing. The storm is harder to see ... Now I see some fantastic shots of tornadoes / structure illuminated by lightning, but sometimes lightning is not so frequent, or may not "light up" the part of the storm you are interested in. This makes photography difficult and even frustrating.
My best suggestion for night chasing is to always keep a larger "buffer" distance between you and a supercell, and consider your "escape routes" more carefully in case things get "dicey". Always try to use equipment to help you see the environment around you better, such as data, live radar (WX Works), and ofcourse, GPS.
You also have the option of some great lightning photography / video at night even far from an electrically active storm, and you will be out of it's "harmful" reach too.
I have done night chases, some with great results, some with nothing, others which scared the living ---- out of me!
Some pictures from great night chases below...
Lightning flash = WOW!
Results of that same beautiful storm = OOps!!