A large low pressure system moved toward SHEBA ship from the west. This low was centered mainly southwest of the ship near the Siberian Coast, however, it covered a large area. To the east, the high pressure system that formerly occupied the Beaufort Sea, was in the northern Canadian Islands. SHEBA ship was under a southerly flow ahead of the low. Barrow was under a south-southwesterly flow.
Barrow was covered by fairly dense, but broken, cirrus and altostratus. Two satellite images are shown for this day to follow the changes in these clouds. Clouds thinned to the south of Barrow over Alaska's north slope.
The trajectories to SHEBA ship show the air from all levels coming from the North Pacific Ocean via the Bering Straight. The lowest levels, surface and 1.0 km trajectories indicate that some of the air came from western Alaska. From 1.5 km and higher, all air came from the North Pacific.
The trajectories to Barrow show the low level air, surface to 1.0 km, came from central and western Alaska. However, from 1.5 km and higher, all air came from the north Pacific Ocean crossing Alaska.
