The CV-580 to SHEBA ship from 18:45 to 22:56 UT. It then flew back to Inuvik leaving Barrow at 00:41 UT.
Most cloud cover vacated the ship moving north. The ship radar showed no echoes after 16:30 UT. Unfortunately, the HRPT images after this time were not picked up at Wisconsin. However, the 16:02 NOAA 12 IR image was acquired and showed the cloud boundary moving off of SHEBA ship. Lidar showed some low level returns. SHEBA ship reported 1/2 mile visibility in fog at 18 UT and 2 mile visibility at 00 UT. The GAC 3.7 micron image indicated possible arctic stratus or fog (dark cloud).
The surface pressure analysis showed that the bubble extension from the Aleutian low over Alaska had weakened. The surface winds were weak and of variable direction around the ship.
Trajectories show the low level air coming from the east, the Beaufort Sea and Canada. The 3 km trajectory came mostly from the Alaskan coast and central Alaska, while the 6 and 9 km air came from the Pacific ocean acrossed Alaska.
The trajectories to Barrow show a slightly different picture. Only the surface trajectory comes from the eastern Beaufort Sea and Canada. The 1.0 and 1.5 km trajectories come from the lower Beaufort Sea but loop south into eastern Alaska. The 3, 6, and 9 km trajectores follow similar lines as SHEBA, crossing Alaska to the Pacific Ocean.
