An American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Jan. 29. Both aircraft plunged into the Potomac River near Reagan Airport.

Wind gusts and tidal conditions could slow operations today as officials try to pull wreckage from the icy Potomac River.

Sixty-seven people were killed after an American Airlines jet and a U.S. Army helicopter collided and crashed into the Potomac River.

The science behind the temperatures? Water transfers heat away from the body 25 times faster than air, according to Johnson.