The CV-580 flew to a Landsat pass area around 69.5 N and 138.3 W.
The surface pattern was very different on 24 April than the previous days. A surface high was invading from the west. This high was moving through the Arctic ocean north of Siberia. Surface winds at SHEBA ship were light from the northwest. In the Beaufort Sea, the winds were from the north. A surface low center was in western Canada. The rest of the Aleutian low was far south in the Pacific along the southern Alaskan coast. The combination of the lows with the invading high caused a large pressure gradient over the Beaufort Sea.
Tractories to the Lansat acquisition point, 69.5 N and 138.3 W, came from the north - the arctic ocean in the area of the pole. This northerly track had not been seen in previous flights. At 6 and 9 km the air appeared to originate in eastern Siberia before flowing north into the arctic.
SHEBA ship trajectories had a slightly different shape. From the surface to 1.5 km, all air came from very near SHEBA ship. The 3 km air came from farther west near the Siberian coast, while the 6 and 9 km air came from Siberia.
