A rare weather system has surprised large parts of India, Pakistan and Afghanistan, bringing rain, thunderstorms, gusty winds and even hailstorms at a time when temperatures usually begin to rise.
Instead of the typical early summer heat, several regions are witnessing cooler conditions, raising questions about what is driving this sudden shift in weather.
Delhi Weather Today: What Is the '1,000-km Rain Band'?
Meteorologists have identified this unusual pattern as a long and nearly straight 1,000-kilometre rain band stretching from Afghanistan through Pakistan and into northern India.
This formation is linked to a Western Disturbance, a weather system that usually forms over the Mediterranean region and travels eastward. However, unlike typical systems that curve, this one has formed as a linear trough, making it unusual in both structure and impact.
This straight-line system has allowed rain clouds to spread over a much wider area, leading to continuous rainfall and storm activity across multiple regions at the same time.
Delhi Weather Today: How is This System Different From Normal Western Disturbances?
Western Disturbances generally peak during winter and bring snowfall to the Himalayas and rain to north India. They usually weaken by March.
However, this system stands out because:
- It has formed later than usual
- It stretches in a straight line instead of a curved pattern
- It interacts with multiple low-pressure systems across India
These combined factors have intensified its impact, leading to widespread rainfall and cooler temperatures.
Delhi Weather Today: Why Delhi Is Experiencing Cold Weather in March?
Residents in Delhi and the NCR region have felt an unusual drop in temperature, with weather conditions resembling winter rather than early summer.
This cooling effect is happening due to:
- Continuous cloud cover is blocking sunlight
- Rainfall reduces surface temperatures
- Cold winds are flowing from the north-west
As a result, daytime temperatures have dropped significantly, staying between 25°C and 28°C, which is below the seasonal average.
Delhi Weather Today: What is Fueling This Unusual Weather Activity?
The strength of this system comes from multiple moisture sources. Weather experts say the disturbance gathers moisture from:
- The Mediterranean Sea
- The Caspian Sea
- The Black Sea
- The Persian Gulf
As the system moves eastward, it picks up additional moisture from the Arabian Sea, which intensifies rainfall when it reaches the Indian subcontinent.
At the same time, several smaller cyclonic circulations across central and southern India are interacting with this system, increasing instability and triggering thunderstorms and hailstorms.
Delhi Weather Today: Impact Across India
The weather system has already caused:
- Heavy rainfall in the eastern and northeastern regions
- Thunderstorms and strong winds across north India
- Hailstorms in isolated areas
- Rain activity even in southern states like Tamil Nadu and Kerala
This widespread impact highlights how unusually strong and expansive the system is.
Delhi Weather Today: Why Are Such March Rains Rare?
Historically, Western Disturbances are most active between December and February. By late March, their frequency drops significantly as atmospheric patterns shift.
However, experts note that:
- Weather patterns are becoming more unpredictable
- Western Disturbances are lasting longer into March and April
- Climate variability may be influencing these changes
This makes such late-season rainfall events rare but increasingly noticeable.
Delhi Weather Today: What Happens Next?
The current system is expected to weaken gradually over the next couple of days. However, forecasts suggest that another weaker Western Disturbance may arrive soon, which could bring more light rainfall.
The ongoing weather event is a result of an unusual Western Disturbance forming a 1,000-km rain band, leading to widespread rain and cooler temperatures. While such events are rare for March, changing weather patterns may make them more frequent in the future.