Thursday, September 30, 2010

September 30 [Day 11] (Peter Sherrington) The temperature was -8C at 0800, reached a high of 15C between 1500 and 1730 and was still 12C at 1900. Ground winds were calm to 3km/h until 1240 when they changed to N-ENE generally 10-15 gusting 20 km/h for the rest of the day. Ridge winds were N all day gusting to 50 km/h to 0900 and then light to light-moderate for the rest of the day. There was not even the trace of a cloud all day and the blue-out conditions made detection of migrant raptors difficult. Movement before 1400 was mainly above the western ridges, and in the afternoon mainly along the Fisher Range to the east, but several birds moved above the valley and birds could turn up anywhere at any time. A total of 91 migrant raptors of a season-high 9 species moved between 0949 and 1840 with 40 of the birds moving between 1300 and 1500. The flight included the season’s first Ferruginous Hawk, a light morph adult, at 1145 and the first Rough-legged Hawk at 1549. Four species had their strongest movement so far this season: 20 Bald Eagles (12 adults, 5 subadults and 3 juveniles), 13 Sharp-shinned Hawks (3a, 1j, 9u), 6 Northern Goshawks (4a, 1j, 1u) and 14 Red-tailed Hawks, 9 of which were light calurus (7a, 1j, 1u), 4 dark calurus (2a, 1j, 1u) and 1 bird was of unknown race, age or morph. The 30 Golden Eagles comprised 15 adults, 6 subadults, 6 juveniles and 3 birds of unknown age. Much kudos is due to Joan, Ed and Chris for helping find the birds against a pure blue backdrop. 11.83 hours (117.42) BAEA 20 (30), NOHA 1 (2), SSHA 13 (34), COHA 1 (4), NOGO 6 (10), UA 2 (3), RTHA 14 (22), FEHA 1 (1), RLHA 1 (1), GOEA 30 (223), UU 2 (2)

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