Tuesday, October 19, 2010

October 17 [Day 27] (Bill Wilson) It was another cold start to the day with a season low temperature of -10C at 0700, rising to 4C between 1400 and 1600 and falling again to -3C at the end of the day. Ground winds were mainly SE-S 2-5 gusting 10 km/h to 1400 after which they were W and ridge winds were SW-SSW moderate to strong. It was cloudless to 1715 after which up to 20% cirrostratus and altostratus developed to the W, but by the end of the day it was cloudless again. There was a good movement of migrant raptors with 179 birds of 5 species moving between 0836 and 1902, although poor lift conditions early in the night meant that strong movement did not begin until after 1300 with highest hourly counts of 33 (1600-1700) and 32 (1700-1800). The flight was dominated by 179 Golden Eagles (90a, 14sa, 45j, 22u) which is the highest count for 6 days, and other migrants were 3 Bald Eagles (2a, 1sa), 2u Sharp-shinned Hawks, 1u Northern Goshawk, 1 dark morph Rough-legged Hawk and 1 unidentified raptor. Non-raptor migrants included 2 Common Loons, 3 American Robins, 130 Bohemian Waxwings and a late Yellow-rumped Warbler, while a pair of Great Horned Owls duetted early in the morning and a couple of Brown Creepers were unusual visitors at the count site. 12.25 hours (304.24) BAEA 3 (82), SSHA 2 (55), NOGO 1 (23), RLHA 1 (18), GOEA 171 (2253), UU 1 (5) TOTAL 179 (2530)

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