. Bulletin of the British Ornithologists' Club. . Escarpment surrounding rirque Contours at 300 m. intervals 55°25' _L_ 55°30' _L_ Map of the Cirque de Cilaos, Reunion, showing sites (1-6) from which Barau's Petrels Pterodroma baraui were observed during January 1974. During the observation period the daily weather cycle was well-marked and fairly constant. Following a clear night and dawn, cloud built up from (all times refer to local time) and, during the afternoon, virtually all areas between 1800 m and 3000 m were in cloud. In the late afternoon strong air currents flowed up the wall
. Bulletin of the British Ornithologists' Club. . Escarpment surrounding rirque Contours at 300 m. intervals 55°25' _L_ 55°30' _L_ Map of the Cirque de Cilaos, Reunion, showing sites (1-6) from which Barau's Petrels Pterodroma baraui were observed during January 1974. During the observation period the daily weather cycle was well-marked and fairly constant. Following a clear night and dawn, cloud built up from (all times refer to local time) and, during the afternoon, virtually all areas between 1800 m and 3000 m were in cloud. In the late afternoon strong air currents flowed up the walls off the Cirque so that by , in the after- glow period, the Cirque and surrounding mountains were once more clear of cloud except for occasional patches below 2000 m which dispersed during the night. I am informed (in litt.) by the Ingenieur en Chef de la Meteorologie at the Ministere des Transports, St. Denis, that such a pattern is characteristic of non-cyclonic periods on Reunion. Observations were made on 9 consecutive evenings, once throughout the night and on 4 mornings (Table 1). Sunrise and sunset were at about and respectively. At the eastern side of the Cirque, where most watches were done, there was complete darkness from about to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : British Ornithologists' Club
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