The correct answer is option 1, a local wind. The word "sirocco" is derived from the Arabic word "sharq," which means east. A sirocco is a hot, dry, and dusty wind that blows from the Sahara Desert across the Mediterranean region, particularly in southern Europe. It is also known as a Mediterranean wind or a Mediterranean hurricane.

A sirocco wind typically occurs when a high-pressure area forms over northern Africa and the surrounding deserts. As the air in the high-pressure area rises, it creates a vacuum that draws in cooler, moisture-laden air from the Mediterranean Sea. This air gets heated as it crosses the desert and picks up dust particles, resulting in a hot and dry wind known as sirocco.

Sirocco winds can reach high speeds and have significant effects on the weather and climate of the regions they pass through. They can cause temperatures to rise dramatically, affect air quality by spreading dust and sand particles, and even contribute to the occurrence of wildfires.

Therefore, option 1, a local wind, is the correct definition of sirocco.