Western disturbance is a meteorological phenomenon characterized by the movement of moisture-laden winds from the Mediterranean region towards the Indian subcontinent, particularly during the winter months. These disturbances are associated with low-pressure systems that bring precipitation in the form of rain or snow.

### Impact on India:

1. Winter Rainfall: Western disturbances primarily affect northern India, bringing significant winter rainfall, especially to states like Jammu and Kashmir, Himachal Pradesh, and Punjab. This is crucial for replenishing water resources.

2. Snowfall: In the Himalayan region, these disturbances often result in heavy snowfall, which is vital for the snowpack that feeds rivers in the summer.

3. Temperature Fluctuations: They can lead to sudden drops in temperature and chilly winds, influencing the overall winter climate in northern India.

4. Agricultural Benefits: The moisture from these disturbances supports the growth of rabi crops, such as wheat, enhancing agricultural productivity.

Overall, Western disturbances play a significant role in shaping the climate and agriculture of northern India.