The Dakotas, frozen thick for weeks, sent an ice wind east for the occasion, but it thawed a bit by Monday.
Valls paid tribute to the efforts of the emergency workers, French and Italian, who searched in perilous conditions of snow, ice and wind from the early morning for those who were missing.
In the upper Midwest, thousands of homes and businesses also lost power because of heavy wet snow, ice and wind in the past couple of days, while rain and snow raised flooding concerns in various areas of the Midwest.
In the middle of November, a freakish weather pattern set in howling wind with ice in its teeth.
Among the hazards expected there Wednesday: lightning, wind and ice, with a little snow and sleet thrown on top for good measure.
"When they come close to the Sun, this ice melts - solar wind blows this material out into space, so you get a tail of matter coming off the comet, " explains O'Brien.
Impact craters surrounding the cap appear to be filled with ice and dust that was either deposited by wind or condensation, or perhaps further remains from an earlier larger ice cap.
But wind, snow and ice meant rescuers decided to delay recovering the body until Saturday morning.
"Today, you have ice that can move in with the wind but then just as easily move away, " Delgado says.
I'm writing this blog from Petermann Glacier in northwest Greenland, where a cold katabatic wind is blowing off the ice onto the deck of the Greenpeace ship Arctic Sunrise.
She takes into consideration weather and wind conditions, avoiding snow, ice and high winds.
Changes in the winter wind field broke up floating sea ice to create cracks that suggest the "opening of a Venetian blind, " said Dr Serreze.
He realized that nearly 50 people were on the ice that had become separated from the shore and being blown out to sea by the prevailing wind.
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