Western Disturbances (WDs) are crucial climatic phenomena affecting the Indian subcontinent’s weather patterns, particularly during the winter months. Here’s an extended simplification of the information provided about these disturbances:
1. Nature of Western Disturbances:
WDs are defined as non-monsoonal precipitation brought about by extratropical storms originating in the Mediterranean region. These disturbances travel eastward, bringing significant winter rainfall and snow to the northern parts of India, which is vital for the winter crops, also known as the Rabi crops.
2. Seasonal Occurrence:
The frequency of WDs varies seasonally, with the most activity recorded in the winter months, followed by the pre-monsoon period. Historically, January and February have seen the highest number of WDs, crucial for the winter crop yields in India.
3. Changes in Frequency Over Decades:
Studies have observed a shift in the pattern of WDs. Comparing data from 1950-1979 to 1993-2022, there has been a decrease in their frequency during the winter season. This long-term change could have implications for the region’s agriculture and water management strategies.
4. Rainfall Impact Analysis:
The impact of WDs on rainfall is evident from the data, which shows fluctuating patterns of precipitation across different regions of India. The 30-year rolling average of rain during December-February has been varying, indicating changes in climatic conditions over time, which may affect water resource planning and agricultural practices.
These long-term changes in WDs are critical for understanding regional climate trends, which can aid in agricultural planning and managing water resources in affected areas.
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