What Happened
- On World Meteorological Day (March 23, 2026), the India Meteorological Department (IMD) inducted a new digital surface meteorological observation system into its surface monitoring network.
- The system uses digital sensors with Wi-Fi-enabled electronics to simultaneously measure air temperature, atmospheric humidity, atmospheric pressure, wind speed and direction, and rainfall, providing geo-tagged real-time data.
- Unlike legacy mercury-based sensors, the new system offers automated quality control of data, remote online monitoring via dashboards, and remote maintenance access — significantly reducing operational costs and human error.
- The digital sensors provide data at a high sampling rate, delivering higher temporal resolution and improved accuracy for real-time meteorological applications.
- This system will, over the following years, completely replace mercury-based sensors across IMD's surface observation network — aligning with global efforts to phase out mercury under the Minamata Convention.
- In parallel, the government announced under Mission Mausam Phase II that 50 Automatic Weather Stations each will be installed in Delhi, Mumbai, Chennai, and Pune during 2026.
Static Topic Bridges
Mission Mausam: India's Weather Modernisation Initiative
Mission Mausam was approved by the Union Cabinet on September 11, 2024, with a budget of ₹2,000 crore over two years. Launched by PM Modi on January 14, 2025 (IMD's 150th anniversary), the mission aims to make India "Weather Ready and Climate Smart" by upgrading weather observation infrastructure, improving forecasting models, and deepening sector-specific services. The mission supports six key sectors: agriculture, aviation, defence, disaster management, tourism, and healthcare. Under Phase II, Mission Mausam focuses on densifying the Automatic Weather Station (AWS) network, deploying 200 Agro-AWS for farm-level forecasts, and installing more Doppler weather radars across the country.
- Mission Mausam: Cabinet approval September 11, 2024; budget ₹2,000 crore (2 years)
- IMD established: 1875; 150th anniversary January 14, 2025
- Six key sectors served: Agriculture, aviation, defence, disaster management, tourism, healthcare
- India's current AWS network: Thousands of stations; expanding under Mission Mausam Phase II
- Forecast accuracy improvement: 40–50% better than previous decades; cyclone track accuracy up 35–40%
- Agro-AWS: 200 deployed for farm-level weather data; supports kharif and rabi crop planning
Connection to this news: The digital surface meteorological observation system unveiled on World Meteorological Day is a direct deliverable under Mission Mausam — it represents the replacement of obsolete mercury-based instruments with modern digital sensors that feed into IMD's national data network.
IMD and Surface Meteorological Observation: Role and Significance
The India Meteorological Department (IMD), established in 1875, is under the Ministry of Earth Sciences (MoES) and is India's principal governmental agency for meteorology. Its surface observation network includes Automatic Weather Stations (AWS), Agro-Meteorological Observatories, and conventional manned weather stations that collectively provide the ground-truth data feeding into Numerical Weather Prediction (NWP) models. Surface observations — temperature, humidity, pressure, wind, rainfall — are the foundational inputs for all weather forecasting, climate modelling, and disaster early warning systems. The quality and density of this network directly determines forecast accuracy, especially for localised extreme weather events like cloudbursts and heatwaves.
- IMD: Under Ministry of Earth Sciences; established 1875; headquartered in New Delhi
- Surface observation network: AWS + conventional stations + agro-met observatories
- Numerical Weather Prediction (NWP): Computational models using surface + upper air + satellite data
- Key parameters: Temperature, humidity, pressure, wind (speed + direction), rainfall, solar radiation
- Agriculture link: Real-time data from AWS helps Agromet Advisory Services (AAS) issue crop advisories
- Disaster management link: Dense real-time networks improve cyclone, flood, and heatwave warnings
Connection to this news: The new digital system directly improves the quality of surface-level data inputs to IMD's NWP models — higher sampling rates and geo-tagged data increase spatial and temporal resolution of forecasts.
Minamata Convention and Mercury-Free Meteorological Instruments
The Minamata Convention on Mercury, adopted in 2013 and entered into force in 2017, is a global treaty under UNEP aimed at protecting human health and the environment from mercury pollution. India ratified the convention in 2018. The convention mandates the phase-out of mercury-added products (including certain measuring devices like thermometers and barometers) by 2020. Traditional meteorological instruments — mercury thermometers, barometers, and maximum-minimum thermometers — are among the devices being phased out globally. The shift to digital sensors in IMD's network is therefore both a technological upgrade and a treaty compliance step.
- Minamata Convention: Adopted October 2013; entered into force August 2017
- India ratified: 2018
- Administered by: UNEP (United Nations Environment Programme)
- Mercury phase-out target: Mercury-added measuring devices banned/phased out from 2020
- IMD's mercury phase-out: Replacement with digital sensors directly addresses Minamata obligations
- Health risk of mercury: Neurotoxic, bioaccumulates in food chains; thermometer breakage = contamination risk
Connection to this news: IMD's new digital surface system eliminates mercury-based sensors — this is simultaneously a weather forecasting upgrade and a fulfilment of India's international obligations under the Minamata Convention to which it is a party.
Key Facts & Data
- World Meteorological Day: March 23 (WMO established March 23, 1950)
- IMD established: 1875; under Ministry of Earth Sciences
- New system parameters: Air temperature, humidity, pressure, wind speed/direction, rainfall
- Features: Wi-Fi-enabled, geo-tagged, automated quality control, remote monitoring dashboard
- Mission Mausam: Cabinet-approved September 11, 2024; ₹2,000 crore budget
- Phase II: 50 AWS each in Delhi, Mumbai, Chennai, Pune during 2026; 200 Agro-AWS deployed
- Minamata Convention: India ratified 2018; mercury measuring devices to be phased out
- India cyclone track forecast accuracy improvement: ~35–40% over previous decades
- Overall IMD forecast accuracy improvement: 40–50% vs earlier decades