Thursday, October 18, 2012


October 18 [Day 28] (Cliff Hansen, assisted by Chris Hunt) The temperature was 1.5C at 0830, rose to a high of 11C at 1600 and was still 7C at 1800. Ground winds were variable and generally light to 1200, after which they were SW 2-12 gusting 15-25 km/h for the rest of the day, and ridge winds were moderate to strong SW all day. Cloud cover was 30% cumulus and lenticular to 1200 after which an arch developed over the Fisher Range that had moved east of the range by 1600 and replaced by 90% cumulus, altostratus and cirrus until the end of the day. Observing conditions were again good but aging of high flying birds was difficult in the morning and late afternoon. The dynamic was similar to that of yesterday with all birds using the eastern route, the eagles gliding very high above the Fisher Range when the arch was present, but otherwise they moved in the face of the ridge or just above it. Movement was again steady all day between 0950 and 1845, and the highest hourly count was 9 Golden Eagles between 1600 and 1700. The flight of 48 birds comprised 1 unaged Bald Eagle, 2 Sharp-shinned Hawks (1a,1u) and 45 Golden Eagles (33a,1sa,11u). As is usual on windy days at the site other birds were relatively scarce, but included 5 adult California Gulls flying low to the south over the meadow, 1 Northern Shrike, 1 American Robin, 1 Song Sparrow and 35 White-winged Crossbills.
11 hours (310.26) BAEA 1 (48), SSHA 2 (58) GOEA 45 (1848) TOTAL 48 (2049)

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