On the heat signal question, the Chief seemed to say that yes it would be possible for the copter technology (which seems to be state of the art - earlier version of the technology was said to be used to find the Boston bomber hiding under a row boat) at that time to see something and they did not see anything.PommyMommy - thanks for an excellent summary of the interview.
I'm still perplexed at the size and speed of the reaction by LE......she was reported missing at 7ish and they had 20 K-9 dogs out by around 8pm and a copter in the air by 9:30pm? Was she married to the police chief? Kudos to Gloucester PD. I think that either they have more information than they're releasing or they were just ready to roll with those on training.
If (speculating) she went in the water at 4-5pm, I wonder if there would still be a heat signal at 9:30 when the copter was up?
He went on to say that the weather conditions were challenging but that Coast Guard and others were able to search the water areas in the search area. What was unclear though was how close in these vessels could come to the shoreline. The Chief mentioned the possibility of putting dive teams into the water as a next step and said that weather and sea conditions will make this challenging but that it would happen next.
Here is video link to some info on the earlier technology in the Boston Bomber case:
Thermal video and photos of Boston bombing suspect, hiding in boat