A large high pressure system occupied the eastern Beaufort Sea and Canada far east of SHEBA ship. Winds at the ship were from the south. A thin altostratus cloud layer covered the ship all afternoon. The radar found light returns from 4.5-5.5 km. The sounding registered two small humidity spikes, one at 3.3 km and a second at 5.5 km.
The trajectories to SHEBA ship show the low level air from the surface to 1.5 km coming from the Beaufort Sea to the southeast. There was extensive open water in the Beaufort Sea. The 3.0 km trajectory traced air back to central Alaska while the higher trajectories at 6 and 9 km traced the air to the southwest, northern Siberia.
