Mistral refers to the northerly or north-westerly (i.e. coming from north) cold wind experienced on the shores of the north-west Mediterranean, mainly around the Rhone-delta. It is more intense during the winter, when pressure is relatively high over the European continent and low over the western Mediterranean; it reaches great force in the rear of a deep depression situated over the gulf of lions that is moving away eastwards or south-eastwards.
Sirocco is a warm, dry and dusty 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.