The large high in the Beaufort Sea is now northeast of SHEBA ship. A low pressure center is to the northwest of the ship. Winds at the ship were strong and southeasterly because of the pressure gradient between these two systems.
Clouds over the ship were a mix of cirrus and altostratus with some surface fog. The ship was on the edge of the high pressure system. The cloud deck ended about 20 km to the east. However, the radar showed a constant alto-layer between 2 and 4 km over the ship all afternoon. Higher echoes up to 9 km appeared after 22:00 UT. The 00 UT sounding showed abundant moisture up to 10 km.
The trajectories to SHEBA ship show the air coming from the south - the Bering Straight and eastern Siberia - except for the surface which traced to the southeast into the Beaufort Sea. Higher trajectories, namely 3 and 6 km, traced south to the Pacific Ocean curving across southwestern Alaska. The 9 km trajectory traced south to eastern Siberia the first day and then cureve to the west along the northern Siberian coast.
The trajectories to Barrow show the surface to 1.5 km air coming from along the northern Alaskan coast of the Beaufort Sea east of Barrow. The surface trajectory traces northward into the Canadian Islands while the 1.0 km trajectory traces east along Alaska's North Slope into the Canadian mainland. The 1.5 km trajector traces south across Alaska. The higher trajectories, 3, 6, and 9 km, trace southwest along Alaska's west coast and then curve southeast into the Pacific Ocean.
