Does ice thickness really matter? Or was it just a question?
I will have to agree more with firedragon here...
IMO, the ice has melted very little so far. Heck, the roads are barely melted off and they are black an retain heat.
there is still a good snow layer on that lake in the video, the snow both reflects the light and acts as insulation.
Another thing in the freeze process in mid jan and mid feb is the snow we had. The more snow on the ice, the more as it acts as an insulation to the outside air. Once the lake has ice on it, and then snow, the amount and rate at whcih it freezes slows.
So, even though there was record cold, the ice wouldn't necessarily be record depth, because we also had record snow.
So, arguably, the lake had more ice in Feb, than now.... but it is de minimis IMO.... if it is 2'6" currently, then it may have been 2'8" then...
It doesn't make a difference in my opinion.
Please everyone read this about the efforts that good men risked to find our Samantha:
http://www.adn.com/2012/04/03/2406095/details-in-koenig-case-remain.html
ICE DIVING IN MURKY LAKE
Before a pair of divers went into the water Monday, the team used sonar and a remotely operated vehicle to look under the ice, Bartenfeld said. Investigators cut a dive hole through ice 2 1/2- to 3-feet thick.
"If you can cut down on the amount of work in the water, that's good. You're working in an environment that's hostile to human life," said Chacon, who's been diving for the FBI for 17 years, longer than any other agent.
That evening, Bartenfeld and another diver slipped into the murky, dark lake water. They couldn't see, but they were guided by the sonar, he said. They felt well-prepared. They are ice-diving certified and use layers of extra FBI procedure to ensure safety, Chacon said.
The divers were tethered to land through hoses that supplied air from a surface tank and provided a channel for communications and depth measurements. They wore helmets to protect their heads from the cold and ice.
They didn't have to dive deep, maybe 40 feet. They stayed in the water just under an hour.
Support crews included FBI paramedics, other divers monitoring equipment, and Anchorage police. About two dozen people were there in all.
much more at the link for the HEROES that found Samantha Koenig.