Friday, September 30, 2011

September 30 [Day 11] (Cliff Hansen, assisted by Anita Walker) Warm weather returned with an initial temperature of 10.5C that rose to a high of 23.5 at 1500 and slowly fell to 16C at 1900. Ground winds were variable S-SW initially 5-10 km/h but gusted to 35 km/h between 1100 and 1500 after which they again became light, and ridge winds were SW-SSW moderate to strong gusting to 102 km/h at 1300. In the morning cloud cover was 40% altostratus that formed a Chinook arch over the Fisher Range to the east, that diminished to 20% as the arch slowly drifted east at 1300 after which it reduced to 10% by 1400. At 1900 90% cumulus, altocumulus and cirrus cloud suddenly developed that persisted for the rest of the day. The arch made high-flying birds easy to detect but aging was impossible in many cases as the birds were silhouetted against the altostratus cloud. It was a delightful day to be in the field but raptor movement was quite slow and sporadic with only a single Cooper's Hawk counted between 1300 and 1700. The day's flight was 28 birds that mainly glided high above the Fisher Range between 0900 and 1900 and which comprised 1 adult Bald Eagle, 1 adult female Northern Harrier, 1 juvenile Cooper's Hawk, 1 juvenile light morph calurus Red-tailed Hawk, 23 Golden Eagles (7a,1sa,2j,13u) and 1 unaged American Kestrel. After 1700 the birds moved lower against the face of the Fisher Range, and the busiest hour of the day came between 1800 and 1900 when 7 birds (6 Golden Eagles and the Red-tailed Hawk) moved. Non raptors were relatively scarce but included a Northern Shrike, 5 Grey-crowned Rosy-Finches and 115 Pine Siskins.

12.33 hours (134.57) BAEA 1 (11), NOHA 1 (2), COHA 1 (3), RTHA 1 (5), GOEA 23 (168), AMKE 1 (2) TOTAL 28 (227)

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