The CV-580 flew over arctic stratus around 71.5 N and 136 W
A very deep low was in the Bering Straight. This caused easterly winds over most of the Beaufort Sea and northeasterly winds at SHEBA ship. Cirrus covered most of the Alaskan coast. The CV-580 flight area was just east of the cirrus seen on the satellite images. The HRPT image of the eastern Beaufort Sea was not acquired at Wisconsin.
Trajectories to the study area of the CV-580 flight, the surface and 1 km air coming from the southeast over western Canada. The 1.5 km trajectory deviates showing air coming directly from the south, from the Pacific across Alaska. There is a large difference between the 1.0 and 1.5 km trajectories. The high level trajectories show the air coming from the southwest, mainly the Bering Sea, across western Alaska.
Trajectories to SHEBA ship, show most of the low level air, surface to 3 km, came from the northeast near the pole. At 6 km the air came from the Chukchi Sea to the southwest of SHEBA ship, and the 9 km trajectory has the air coming from the north near the pole with a long loop to the west of SHEBA ship.
