So does the Bible say that there will be a nuclear war during the tribulation?

Both the Old and New Testaments describe an event that seems to be a nuclear war. “A third part of mankind was killed by the three plagues of fire, smoke and sulfur” (Rev. 9:18). This verse describes the precise effects of a nuclear blast. In Revelation 8:7 we see that “A third of trees were burned up, and all green grass was burned up.” In the Old Testament, Joel 2:30 says, “I will show wonders in the heavens and on the earth, blood, and fire, and billows of smoke.” From these verses we clearly see a judgment of fire sent to earth. This could very easily be a nuclear war.

http://www.raptureready.com/faq/faq261.html