Fróðskaparrit - 01.01.1983, Page 76

Fróðskaparrit - 01.01.1983, Page 76
THE AUTUMN MIGRATION AT AKRABERG,... 79 Table 1. Survey of the weather at 9.00 a.m. at Akraberg. Date Dir. of Wind Forcein knots Precipitation Temp Cloud °C Cover Visibility 17/9 SW 25 9 6/8 good 18/9 SW 12 9 2/8 good 19/9 SW 12 8 2/8 good 20/9 NE 8 rain 8 8/8 moderate 21/9 NNW 28 rain 7 8/8 moderate 22/9 NNW 8 6 6/8 good 23/9 ESE 30 7 8/8 good 24/9 SE 9 8 2/8 good 25/9 E 33 8 8/8 fog 26/9 ENE 12 8 8/8 poor 27/9 WNW 12 drizzle 7 8/8 poor 28/9 W 12 rain 7 8/8 moderate 29/9 SSW 20 8 5/8 good 30/9 S 14 7 3/8 good 1/10 SSW 32 8 8/8 good 2/10 SW 24 8 3/8 moderate 3/10 sw 12 10 2/8 moderate 4/10 SE 6 9 8/8 fog 5/10 E 30 rain 10 8/8 poor 6/10 NNE 20 showers 6 8/8 moderate 7/10 NE 24 7 8/8 good 8/10 NE 28 6 8/8 good 9/10 NE 12 6 8/8 good 10/10 E 8 7 6/8 good 11/10 SE 8 8 3/8 good Fig. 5. The distribution of wind-directions during the observation period. directions, which make migration from the Scandinavian mainland possible. Table 2 has been made on the basis of weather maps from The Meteorological Institute. Table 1 and figure 5 show the weather situation at the weather station at Akraberg at 9.00 a.m. not considering possible changes later in the day. The work had to have a very experimenting character based on confident prospects of Akraberg as a permanent place of observing migrating birds. The daily activity was deter- mined by the intention of recording 1) migra- ting birds above sea and land, 2) resting birds on land primarily. The weather conditions and the number of birds seen in the morning determined where the observations took place later in the day.
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