Fireworks in Boston, and a hurricane in the Carolinas, created challenges for stat spinners this morning.

Big Brother‘s first elimination of its 16th season finished first in overall audience (5.12 million viewers) and, if ratings hold, in the demo (1.6).  (Two nights earlier, the fourth episode of the 16th season of Big Brother clocked a 1.8 demo rating, and 5.61 million viewers — the demo performance being a 22% drop from previous week, maybe because the episode featured a spelling bee, as well as the usual internecine shenanigans.) Last night’s 9 PM episode — in which SPOILER ALERT! Joey Van Pelt became the first BB householder to bite the dust, by unanimous vote — was pre-empted in Boston for that city’s annual July 4th Boston Pops concert (12.6) followed by traditional Boston Post-Pops July 4 Fireworks (15.2), CBS noted, adding that there also may have been pre-emptions in some markets for Hurricane Arthur coverage, which may also have affected other broadcasters.

CBS’ The Big Bang Theory repeat (1.5, 6.619 million) ruled at 8 PM, but Fox’s Hell’s Kitchen (1.4, 4,212 million) took over at 8:30 in the demo, besting CBS’ The Millers repeat (1.0, 4.659 million). Fox’s Gang Related (0.8, 2.609 million) fumbled Hell‘s momentum at 9, though it wound up No. 2 in the demo in its hour.

NBC kicked off the holiday weekend with an Undateable mini-marathon, which opened at 8 PM with a 0.5 rating (for a repeat) and 2.3 million people, and grew to 0.8 and 2.2 million. Once Undateable clocked out, Last Comic Standing (1.1, 3.3 million viewers) checked in, winning the 10 PM hour among broadcasters in the demo. Despite the night’s pre-holiday distractions, Last Comic Standing inched up, week-to-week, by 10% the demo (1.1 vs 1.0) and 3% in total viewers (3.278 million vs. 3.188 million). ABC’s Black Box wasn’t competitive (0.6, 3.657 million) at 8 PM, but the network noted its 9 PM  Rookie Blue (0.7, 5.1 million ) gave Big Brother a run for its money in overall audience — though not in the demo.

At 10 PM ABC’s NY Med (0.7, 4.7 million) was the most-watched TV show in its hour for the second week in a row, while tying CBS’s Elementary  repeat (0.7, 4.0562 million) in the demo.