The low pressure system south east of the Mackenzie Delta remained stable. Inuvik was still at the edge of the cloud complex. Additionally a front advanced from North West. Despite the not easy to predict weather situation two flights were scheduled as before and after the passage of the front good measurement conditions were expected. The early flight was performed above the Mackenzie Delta close to Inuvik before the front arrived with midlevel and cirrus clouds. The flight path was chosen to be in a small box above land, where cloud tops were expected to be higher. First a longer straight leg was flown followed by a horizontal pattern with different legs perpendicular to the first leg. To be back before the frontal clouds impact the measurements a short flight of less than two hours and an early take-off of about 9:30 was scheduled.

At take-off Polar 5 was ahead of Polar 6 to explore the cloud situation in the area. Low clouds partly closed, partly patchy were found in the surrounding area. But during the first part of flight also high and thick cirrus clouds covered the sky. Especially the radiation measurements of Polar 5 were influenced by this cirrus until one third of the first leg from C1 to C2 was reached. At the beginning also thin midlevel clouds at about 10,000 ft altitude were present. Therefore, Polar 5 ascended to 11000 ft and stayed there for the rest of the flight. In the last two third of the first leg the conditions for remote sensing improved significantly. Partly closed, partly patchy low level clouds, unaffected by cirrus clouds above could be sampled by the remote sensing instruments of Polar 5. When Polar 5 reached C2 it turned in a square pattern back to C1 to let Polar 6 pass and go ahead. During the horizontal pattern back towards Inuvik, at each intersection of the first leg, a drop sonde was released to cover the horizontal variability of the atmosphere along the first leg. After the third intersection Polar 5 approached again the region, which was influenced by thick and high cirrus clouds.

Polar 6 first sampled a low layer cloud which was very thin and patchy. Cloud top was found at about 2.800 ft and cloud bottom at about 2,100 ft. Between different steps were flown to obtain a profile of the cloud properties. At the northernmost point a second cloud layer above the low cloud was visible. Flying back along the staggered pattern only the cloud top was scratched to allow a good comparison with the remote sensing measurements. Later reaching C5 cloud top was increased to about 4,000 ft. At the end of the pattern Polar 6 climbed up to 10,000 ft and descended in steps for an aerosol profile.