http://www.latinoreview.com/news/terminator-salvation-int-l-trailer-5832 My name is John Connor. You killed my father. Prepare to die.
If the nukes were all air burst ones, which all moderns are, then there wouldn't be a nuclear winter. Air burst nukes explode just above their target. Using the shockwave more than the radioactive fire ball to do the damage. This kicks up relatively little fallout.