data from accuweather.com and clear sky clock:

time (CST)	6pm	7pm	8pm	9pm	10pm	11pm
temperature (F)	60	55	55	53	50	50
dewpoint (F)	42	37	36	34	32	32
humidity (%)	51	51	50	48	49	50
w-dir	WNW	NW	NNW	NNW	N	N
w-spd (MPH)	9	10	11	12	11	10
cloud (clear x/10)	10	10	10	10	10	10
transparency x/5	5	5	5	5	5	5
seeing x/5	1	1	1	1	1	2
darkness (lim. mag.)	6.2	6.2	6.2	6.2	6.2	6.2

Orbital and physical characteristics for computing star charts: http://en.wikipedia.org/wiki/2007_TU24

Starry Night shows 2007 TU24 high in NW around 8pm; also shows it passing in front of open cluster M34 between 8:15pm and 8:25pm. Starry night also computed apparent magnitude (using data from wikipedia) as bright as 9.0. NASA HORIZONS, however, estimates the brightest at 10.5 — quite a bit fainter (and probably more accurate). Poor seeing conditions not going to help, but the rate at which this thing will be moving makes me want to try.