28 June to 5 July a general southerly flow cover SHEBA ship with numerous clouds. A surface high was far east of the ship in Canada while a general low was south and west of the ship. Fog occurred but precipitation was not reported.
The second phase opened on 5 July with a weak low in the Chukchi Sea. Winds were southerly.
A large surface high moved out of Siberia across the Chukchi Sea into the Beaufort Sea from 7- 9 July . The northern Siberian coast had not seen a high in months. SHEBA ship was north of the high. It experienced westerly winds at all levels and a mixture of cloud cover with out precipitation.
10-11 July saw a familiar pattern of a high in the Beaufort with some form of a weak low/trough in the Chukchi.
Another very large high approached SHEBA ship from the northwest on 12 July. This was a rare event since most of the highs affecting the ship had previously been to the east and southeast in the Beaufort Sea. The last time a high came from the west was on 25 April. This high kept moving east and by the time of the July 15 flight, it was in the eastern Beaufort Sea and Canada. This high stayed in the Beaufort Sea until 28 July. However, SHEBA ship was caught under cloud cover from a small low to the west. Cloud cover was highly variable from 12-28 July with many broken altostratus and cirrus patches and clear areas in between. Fog was occasionally reported but precipitation was not. Surface winds were generally light and southerly. Upper level winds were southeasterly at flight altitude, 6 km, but westerly above at 9 km.
On 26 July a front crossed SHEBA ship coming from the northwest. A low was located to the north, near the pole. Rain was reported and surface winds became strong and southwesterly. From 26-29 July, SHEBA ship was south of a very large low. Winds were fairly strong and from the southwest at all levels. The altostratus and cirrus moved to the northeast briefly on 28 July leaving only low stratus. More altostratus on the back side (southwest side) of the low returned on the 29th. Snow was reported at 00 UT on 30 July (afternoon of the 29th) which continued through the 30th.
The trajectories reflect the nearly stationary position of the high in the Beaufort Sea to the east. Most of the low level trajectories come form the east circling around the high. In a few cases they traced back to the south. Higher level trajectories trace around the high for the later flights from 28-30 July. But in earlier flights they reflect southwesterly and westerly winds.
