Fróðskaparrit - 01.01.1983, Side 76

THE AUTUMN MIGRATION AT AKRABERG,...
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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.