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SkyCast: How Delhi Airport Plans to Outsmart Fog
Every winter, the same grim ritual plays out at Delhi's Indira Gandhi International Airport. A blanket of dense fog rolls in before dawn, runway visibility collapses to a few dozen metres, and the country's busiest airport grinds to a crawl. Flights stack up in holding patterns, planes divert to Jaipur or Lucknow, and arrival boards fill with the dreaded word: delayed. In a single bad fog event this January, well over a hundred flights were cancelled in a day and hundreds more ran late. Now India is betting that a new weather brain at the airport can change that story. On 29 May 2026, Union Minister Jitendra Singh inaugurated SkyCast, India's first integrated aviation weather monitoring system, and the claim attached to it is bold: the country has joined a club of just 19 nations worldwide with this level of atmospheric intelligence above their runways.
What SkyCast Actually Is
SkyCast is not a single gadget but a stack of instruments working together to build a live, three-dimensional picture of the air directly above the airport. At its heart sits a boundary-layer Radar Wind Profiler, which continuously tracks wind speed, wind direction, turbulence and vertical air movement up to roughly three kilometres above the ground. That vertical slice of atmosphere matters enormously for aviation, because it is exactly the layer an aircraft passes through during its final approach and landing.
Around that core, SkyCast bundles several other remote-sensing tools. A SODAR system uses sound waves to probe low-level winds. A Microwave Radiometer reads temperature and humidity profiles. A Ground-based Fog Aerosol Spectrometer studies the tiny particles around which fog droplets form, while a CL61 Lidar-based ceilometer measures cloud base and visibility. Read together, these feed a continuous stream of data about how, when and where fog or turbulence is likely to develop. The result is less a forecast in the old sense and more a real-time, evolving read of the sky.
Why Fog Is Such an Expensive Problem
To understand why this is news worth caring about, look at what fog does to Delhi every winter. The fog season typically runs from mid-December to early February, and the worst hours are between roughly 3 a.m. and 9 a.m., precisely when a heavy bank of early-morning departures and arrivals is scheduled. When visibility crashes, the cascade is brutal: ground holds, diversions, missed connections and knock-on delays that ripple across the entire domestic and international network for the rest of the day.
Delhi's main runways are equipped for CAT III operations, a category that in principle lets suitably certified aircraft land in visibility as low as around 50 metres. But the safety net has holes. Many crews and older narrow-body jets are not certified for those minimums, so even a CAT-III-capable airport slows dramatically in thick fog. The economic and human cost is real: stranded passengers, fuel burned in holding patterns, crews timing out, and airlines absorbing the bill for cancellations. Anything that buys pilots and controllers a clearer, earlier read of conditions translates directly into fewer of those disruptions.
The Decade of Science Behind It
What makes SkyCast more than a procurement headline is its scientific lineage. The system did not appear out of nowhere; it grew out of the Winter Fog Experiment, known as WiFEX, which the Indian Institute of Tropical Meteorology and the India Meteorological Department launched together at Delhi airport back in 2015. For roughly a decade, researchers parked instruments on the airfield and studied the fine details of how Delhi's fog actually forms, how aerosols and pollution interact with moisture, and how the urban boundary layer behaves through the night.
That patient field work paid off in a concrete tool: a high-resolution fog prediction model that authorities say reaches better than 85 per cent accuracy for very dense fog conditions. SkyCast is essentially the operational, day-to-day product of that research, taking what was once an experimental campaign and turning it into a permanent system feeding live guidance to the people who run the airport. It is a rare and welcome example of long-horizon Indian science translating into something passengers will feel.
What It Means for Pilots and Passengers
The practical promise is timing. Officials describe SkyCast as able to deliver advance alerts to aircrew within short windows of around three hours before conditions deteriorate. In aviation, a few hours of reliable warning is a lot. It gives airline operations centres room to re-sequence flights, lets pilots and dispatchers make calmer go or no-go calls, and helps air traffic controllers manage the flow rather than react to a sudden whiteout.
For passengers, the benefit is indirect but meaningful. Better short-term prediction does not magically clear fog, and no system can make an uncertified aircraft land blind. What it can do is reduce the chaos at the margins: fewer surprise diversions, smarter scheduling around the worst windows, and more accurate information so travellers are not left guessing at 4 a.m. in a crowded terminal. Over a full winter, even modest improvements in how disruptions are managed add up across millions of journeys through India's busiest hub.
A Piece of the Bigger 'Mission Mausam' Push
SkyCast also slots into a larger national ambition. It falls under Mission Mausam, the government's flagship programme to modernise India's weather and climate observation capabilities and make forecasting sharper, faster and more useful for everyday decisions. Aviation is one of the most demanding test cases for that mission, because the margin for error is small and the stakes are high.
The rollout is meant to spread. Officials have said the next SkyCast facility is planned for the upcoming Noida International Airport at Jewar, with further expansion to other airports across the country to follow. That matters because fog is not Delhi's problem alone; large stretches of the Indo-Gangetic plain, from Punjab through Uttar Pradesh and Bihar, suffer the same dense winter fog that disrupts road, rail and air travel. A network of SkyCast-style installations could eventually give northern India a shared, high-resolution view of one of its most stubborn seasonal hazards.
What Comes Next
The real test will arrive with the cold months. A May inauguration is the easy part; the hard part is the deep fog of late December and January, when the system has to prove it can give controllers and airlines the early, trustworthy signals it promises. Independent verification of how much it actually trims delays and diversions over a full season will matter more than any launch-day claim.
There are open questions worth watching. How will SkyCast data be folded into airline decision-making and air traffic management in practice? Will smaller carriers and older fleets, the ones most often grounded by fog, see a genuine benefit, or will the gains flow mainly to airlines already equipped for low-visibility operations? And how quickly can the system scale to other fog-prone airports before next winter? For now, India has taken a clear step from studying its fog to actively reading it in real time. If SkyCast lives up to its billing, the most visible proof will be quiet: a January morning at Delhi airport that, against all odds, simply runs on time.
Source: swarajyamag.com
