Nile Basin areas affected by the pressure of the following:
A - area of high pressure Permanent Azzurri beyond the Tropic of Cancer which is the source of the prevailing winds in the northern part of the Near and Middle East of the Nile Basin and its influence extends to the south in the winter.
B - tropical low pressure area, which according to budge virtual movement of the sun and wind that will attract from the south and south-west at the confluence of the Nile, Atbara.
C - variable-pressure area over the crusty Asia shall be:
1 - high winter.
2 - low in summer, which helps to attract southerly winds and southwest and fall rains to southern Sudan and Abyssinia.
التسميات
The climate of the Arab world