Sirocco is a warm, dry and dust laden local wind which blows in northerly direction from Sahara desert over North Africa as a dry wind and picks up moisture as it crosses the Mediterranean. Since they carry red dust over Sahara, the rainfall which they cause is called blood rain sometimes.
These are hot tropical winds coming from the Sahara desert. It is created in the northern Africa .It travel eastward over the southern Mediterranean n due to the low pressure created at the eastern side. It is very dry and hot. It can occur at any time of the year. Even it passes through Mediterrenean and then reaches the south, but still it doesn’t contain moisture and doesn’t produce rainfall. It damages crops especially wine and olives
In Adriatic and Aegean Sea,this hot wind (Sirocco), better known as Gharbi,gathers much moisture causing fog,heavy dew and rain. This may be called blood rain as the wind is carrying red dust of Sahara desert.