A 1,000-kilometre rain band has swept across Afghanistan, Pakistan, and India this week, bringing storms, hailstorms, and a drop in temperatures at a time when summer heat typically takes hold. Delhi has recorded its wettest March in three years, and the India Meteorological Department has issued yellow and orange alerts across multiple states.
What Drives This System
A western disturbance with an upper-air cyclonic circulation over northern Pakistan drives the current weather. Western disturbances typically originate over the Mediterranean Sea and travel northeast, bringing snow and cold waves during winter months. This system behaves differently.
Instead of curving northeast, this disturbance moves in a straight line, forming a trough that stretches from Afghanistan through Pakistan and into India. This straight-line formation amplifies storm intensity, sustaining heavy rain, lightning, and winds ranging from 40 to 80 kmph across a wide area. Climate scientist Dr. Pradeep described the structure on X as “quite different” and warned of the capacity to generate strong thunderstorms.
Where the Moisture Comes From
The system draws its core moisture from evaporation over the Mediterranean, Caspian, Black, and Persian Gulf seas. As it travels eastward across the Middle East, the Arabian Sea adds further moisture, which the Himalayas intensify through orographic lift. Additional troughs over the Gujarat-Mannar region strengthen low-level convergence, driving intense weather activity across a broad area.
States That Face the Impact
The IMD has issued alerts covering northern and northwestern states including Delhi-NCR, Punjab, Uttar Pradesh, Haryana, and Rajasthan. Sub-Himalayan West Bengal and Sikkim have received heavy to very heavy rain. Southern states including Karnataka, Andhra Pradesh, Kerala, and Tamil Nadu have received significant showers. Himalayan regions face heavy snowfall accumulation.
In Delhi, temperatures that stood at 33.6°C on Wednesday have dropped to a forecast range of 26–28°C by Friday. Gusty winds of up to 50 kmph have disrupted flights and reduced visibility across the capital.
Why March Has Started to Feel Unpredictable
India historically experiences four to six western disturbances per month between December and February. Activity drops sharply by late March as the jet stream weakens and shifts northward. A system of this scale during this period historically qualifies as rare.
Recent trends tell a different story. The western disturbance season has lengthened, with activity now extending into April. Stronger subtropical jet streams and broader climate variability drive this shift, making late-season events more frequent. Meteorologists note that this pattern marks a structural change in seasonal weather behaviour rather than a one-time event.
What Happens Next
The current system will remain active over the Western Himalayas and surrounding plains through Friday, with activity expected to reduce thereafter. A weak western disturbance will approach from March 22. Temperatures will rise by 3–5°C from March 22 onward, with highs of 32–34°C forecast by March 25, returning conditions to seasonal norms.
The IMD has advised residents to stay away from affected areas, prepare for sudden weather changes, follow official updates, and avoid spreading unverified information about the system.
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