On FOX at the news break they said the launch is "imminent"...but also it was said in a kind of ho-hum tone, so who knows?
It's night time there now..would they prefer a daylight or dark launch?
Before I went to bed last night I think I read Fox had reported the missile was being fueled. Was there any further word on that? I guess that's why they're describing the launch as "imminent."
...South Korea's Yonhap news agency, citing a South Korean government official, reported that the weather around the North Korean launch site was bad, indicating the North may not fire its missile Sunday.
Satellite weather images posted on the Web site of the South's Korea Meteorological Administration showed clouds around the launch site in northeastern North Korea as of early evening.
A missile launch "depends a lot on weather conditions,'' a South Korean intelligence official told The Associated Press, but he didn't comment on weather conditions in the area.
With such weather, if there was no particular movement by 8 p.m. (1100 GMT) "we can say a missile won't be launched today,'' Yonhap quoted a Foreign Ministry official it did not identify as saying.
A nighttime launch is considered unlikely.
http://www.startribune.com/722/story/500153.html
I think the choice of time of day is purely driven by public relations considerations.
When the U.S. launches a satellite, the driving consideration is the intended orbit. You want to launch when you will expend the least fuel manuveuring into final orbit. If you don't care much about the orientation ("right ascension of the ascending node") of your orbit, one launch window looks pretty much like another.