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VayuMet Weather

Comprehensive Aviation & Meteorological Information System

What's New
Latest features & updates
District Impact
Weather impact forecasting
Aviation Weather
TAF, METAR, SIGMET
Shortcuts
Keyboard commands

About VayuMet Weather

VayuMet Weather is an advanced interactive weather visualization platform designed specifically for aviation professionals, meteorologists, and weather enthusiasts. The system provides real-time and forecast weather data with a focus on Indian airspace and surrounding regions.

The platform integrates multiple data sources including Terminal Aerodrome Forecasts (TAF), Meteorological Aerodrome Reports (METAR), Significant Meteorological Information (SIGMET), satellite imagery, radar data, and numerical weather prediction models to provide comprehensive situational awareness for flight operations and weather analysis.

Version 2.1 introduces the revolutionary District-Level Weather Impact Forecast system, enabling users to assess weather impacts at the district level across India with detailed forecasts up to 120 hours.

What's New in Version 2.1

District-Level Weather Impact Forecast

Released: December 2025

A comprehensive new feature that provides weather impact assessments at the district level for all 700+ districts in India. The system evaluates multiple weather parameters and classifies impacts into High, Moderate, Low, or No Impact categories.

  • Impact Map: Color-coded district boundaries showing impact severity (transparent for no impact)
  • Time Animation: Step through 6-hour intervals up to 120 hours (5 days)
  • Detailed Popup: Click any district to see current values and impact conditions
  • Forecast Tray: Comprehensive forecast view with daily summary and trend charts

Enhanced Forecast Visualization

Released: December 2025

Redesigned forecast tray matching the TAF tray format with side-by-side layout:

  • Daily Summary Panel: Compact cards showing daily statistics (Avg/Max/Min Temp, Precipitation, Wind, Cloud)
  • Three-Chart Stack: Cloud Cover, Wind Speed & Direction, Combined Precipitation & Temperature
  • Convective Precipitation Overlay: Smaller bars overlaid on total precipitation for thunderstorm identification
  • Wind Direction Arrows: Visual representation of wind direction on wind chart

Surface Weather Surface Weather Layers

Released: November 2025

New live weather visualization layers from METAR observations:

  • Surface Temperatures: Color-coded temperature display at each station
  • Surface Winds (Dir/Spd): Wind barbs showing direction and speed in knots
  • Weather Icons: Visual weather condition representation

UI/UX Improvements

Released: December 2025
  • Unified time controls design for forecast and impact layers
  • Improved popup header sizing to match content width
  • Responsive design optimizations for mobile devices
  • Collapsible control panel starting in collapsed state
  • Status badges for active layers

Key Features

Interactive Mapping Interactive Mapping Multiple base map options (Light, Dark, Satellite) with India state boundaries overlay for enhanced geographical context.
Real-time Weather Real-time Weather Live satellite imagery, radar composites, and current weather conditions from meteorological stations across India.
Aviation Data Aviation Data TAF, METAR, and SIGMET information with flight category classification (VFR, MVFR, IFR, LIFR) for rapid decision-making.
Forecast Models Forecast Models High-resolution weather forecast overlays including precipitation, clouds, turbulence, icing, and wind shear predictions.
TAF Trend Analysis TAF Trend Analysis Interactive charts displaying visibility, wind, cloud base, and weather phenomenon trends over forecast periods.
Time Animation Unified time control system for animating temporal weather layers with play/pause and step-through capabilities.
Renewable Energy Renewable Energy Wind and solar power potential forecasts for energy sector planning and resource assessment.
Air Quality Air Quality PM2.5 and PM10 pollutant concentration forecasts for health and environmental monitoring.
District Impact Forecast Weather impact assessment at district level with 120-hour forecasts, impact severity classification, and detailed trend charts.
Surface Weather Display Surface Weather Display Live temperature and wind observations displayed directly on the map with color-coded values.

Quick Start Guide

Get started with VayuMet Weather in a few simple steps:

  1. Open the Control Panel: Click the menu icon (☰) in the top-right corner of the map
  2. Select a Base Map: Expand "Map Selection" and choose Light, Dark, or Satellite
  3. Enable Weather Layers: Expand any category (Aviation Weather, Live Weather, etc.) and check the layers you want to view
  4. Interact with Data: Click on markers, icons, or polygons to view detailed information
  5. Use Time Controls: When time-based layers are active, use the controls at the bottom-left to animate through time
  6. Explore District Impact: Enable "Weather Impact Map" under "District Level Forecast & Impact" to see impact assessments

How to Use

Layer Selection

Weather Data Interaction

Time-based Layers

Flight Categories

Weather stations are color-coded based on flight conditions:

District Impact Forecast

The District Impact Forecast feature provides weather impact assessments for all districts in India:

Enabling the Layer

  1. Open the Control Panel
  2. Expand "District Level Forecast & Impact"
  3. Check "Weather Impact Map"
  4. Wait for data to load (progress indicator shown)

Impact Severity Levels

HIGH MODERATE LOW NO IMPACT

Impact Criteria

Parameter HIGH MODERATE LOW
Temperature (Cold) < -5°C -5 to 5°C 6 to 10°C
Temperature (Hot) > 48°C 43 to 48°C 39 to 43°C
Total Precipitation (6h) > 64 mm 33 to 64 mm > 0.1 mm
Convective Precipitation (6h) > 35 mm 10 to 35 mm > 0.1 mm
Wind Speed > 33 kts 25 to 33 kts 15 to 25 kts
Wind Gust > 33 kts 25 to 33 kts 15 to 25 kts

Using the Impact Time Controls

Viewing Detailed Forecasts

  1. Click on any district polygon
  2. View the popup showing current impact level and weather values
  3. Click "View Detailed Forecast" to open the forecast tray
  4. The tray shows:
    • Daily Summary: Day-by-day statistics in compact cards
    • Cloud Cover Chart: Cloud percentage over time
    • Wind Chart: Wind speed, gust excess, and direction arrows
    • Precipitation & Temperature Chart: Combined view with convective precipitation overlay

Keyboard Shortcuts

The following keyboard shortcuts are available when time-based layers are active:

← Left Arrow Step backward in time (previous frame)
→ Right Arrow Step forward in time (next frame)
Space Spacebar Toggle play/pause animation

Note: Keyboard shortcuts work for unified time controls (forecast layers, satellite, radar). Impact layer has separate controls but uses the same button interface.

Product Details

Comprehensive guide to all weather layers available in VayuMet Weather, their sources, parameters, and operational utility for different user groups.

Map Selection Map Selection

Light Base Map

Source: CartoDB Voyager (OpenStreetMap data)

Description: Clean, light-colored base map with minimal labels, optimized for overlaying weather data without visual clutter.

Operational Utility: Ideal for daytime use and presentations. Provides clear geographical context while maintaining focus on weather overlays. Best for printing and documentation.
Dark Base Map

Source: CartoDB Dark (OpenStreetMap data)

Description: Dark-themed base map with reduced eye strain, featuring subtle terrain and political boundaries.

Operational Utility: Optimal for extended monitoring sessions and night operations. Reduces screen glare in dark environments. Weather phenomena appear more vivid against dark background. Preferred for 24/7 operational centers.
Satellite Base Map

Source: Esri World Imagery

Description: High-resolution satellite imagery showing actual terrain, vegetation, and infrastructure.

Operational Utility: Essential for visual flight planning and terrain assessment. Helps pilots identify landmarks and terrain features. Useful for search and rescue operations, agricultural aviation, and drone operations requiring visual terrain reference.
India State Boundaries

Source: GeoJSON political boundaries

Description: Administrative boundaries of Indian states and union territories with minimal styling.

Operational Utility: Critical for regulatory compliance and administrative reporting. Helps meteorologists issue state-specific weather warnings. Essential for coordination between regional meteorological centers and state disaster management authorities.

Live Weather Live Weather

Weather Icons

Source: Derived from METAR observations

Description: Visual icons representing current weather conditions at each reporting station, based on present weather (wx_string) and sky cover data.

Operational Utility: Provides instant visual situation awareness for pilots and dispatchers. Enables rapid identification of thunderstorm, fog, rain, snow, or dust areas. Critical for pre-flight briefings and en-route weather monitoring. Helps non-technical users quickly understand weather patterns.
Surface Temperatures

Source: METAR observations (temp_c field)

Description: Color-coded temperature display at each METAR station. Colors range from blue (cold) through green (moderate) to red/purple (hot/extreme).

Operational Utility: Quick assessment of temperature patterns across the region. Helps identify heat waves, cold fronts, and temperature gradients. Critical for aircraft performance calculations (density altitude). Important for agricultural frost warnings and heat stress advisories.
Surface Winds (Dir/Spd)

Source: METAR observations (wind_dir_degrees, wind_speed_kt)

Description: Wind direction arrows with speed values at each station. Arrow points in the direction wind is coming FROM. Speed displayed in knots with color coding (green/yellow/orange/red for increasing speeds).

Operational Utility: Essential for runway selection and takeoff/landing performance. Identifies wind convergence/divergence zones. Critical for helicopter operations and crosswind assessment. Supports fire weather monitoring and agricultural spraying operations.
Satellite Imageries (IR)

Source: RainViewer API - Infrared satellite composite

Update Frequency: 10-15 minutes

Description: Infrared satellite imagery showing cloud top temperatures. Colder temperatures (higher clouds) appear brighter, indicating potentially severe convection.

Operational Utility: Essential for monitoring large-scale weather systems, tropical cyclones, and mesoscale convective systems. Enables early detection of developing thunderstorms by identifying cold cloud tops. Critical for nowcasting (0-2 hour forecasts). Used by flight dispatchers for route planning around convective systems.
Radar Mosaic

Source: RainViewer API - Composite radar network

Update Frequency: 5-10 minutes

Coverage: Indian Doppler Weather Radar network

Description: Composite of ground-based weather radar showing precipitation intensity and location with high spatial and temporal resolution.

Operational Utility: Most accurate tool for real-time precipitation detection and intensity assessment. Critical for aircraft convective weather avoidance. Essential for airport operations (landing/takeoff decisions, ground handling). Vital for flash flood warning systems.
Winds 1.5km (850hPa)

Source: Numerical weather model output

Altitude: ~1,500 meters / ~5,000 feet / 850 hPa pressure level

Description: Animated wind velocity field showing wind speed and direction at lower cruise altitude. Vector field visualization with color-coded wind speeds.

Operational Utility: Critical for flight planning at low to medium altitudes (regional/turboprop aircraft). Identifies low-level jet streams affecting climb/descent performance. Essential for calculating fuel requirements and flight times. Important for air quality modeling (pollutant transport). Supports renewable energy sector (wind farm site assessment).

Aviation Weather Aviation Weather

Airport Forecast (TAF)

Source: India Meteorological Department (IMD)

Format: WMO TAF code

Validity: 24-30 hours

Description: Terminal Aerodrome Forecasts providing expected weather conditions at airports including wind, visibility, cloud cover, and significant weather phenomena.

Operational Utility: Mandatory for flight planning and regulatory compliance (DGCA requirements). Enables pilots to assess destination weather acceptability. Critical for alternate airport selection. Interactive trend charts enable visualization of forecast evolution.
Airport Weather (METAR)

Source: Aviation weather observation stations

Format: WMO METAR code

Update Frequency: Hourly, with SPECI (special) observations for significant changes

Description: Current observed weather conditions including temperature, dew point, wind, visibility, pressure, cloud layers, and present weather.

Operational Utility: Primary source for current airport conditions used by pilots for go/no-go decisions. Essential for approach and landing planning. Flight category color-coding enables rapid assessment of operational limitations.
In-Flight Hazards (SIGMET)

Source: Meteorological Watch Offices (MWO)

Format: WMO SIGMET code

Validity: 4 hours

Hazard Types: Thunderstorms (TS), Turbulence (TURB), Icing (ICE), Volcanic Ash (VA), Tropical Cyclones (TC), Mountain Waves (MTW)

Description: Significant meteorological information about hazardous weather phenomena affecting flight safety, displayed as polygons with hazard-specific icons.

Operational Utility: Critical safety information for flight planning and en-route operations. Enables avoidance of severe turbulence, icing, and convective activity. Mandatory consideration for international flight operations. Color-coded polygon display enables rapid spatial hazard assessment.
Low Level Wind Shear

Source: Numerical weather prediction model

Altitude: Low-level (surface to 2000 ft AGL)

Forecast Range: 0-240 hours (6-hour intervals)

Description: Low-level wind shear forecast showing sudden changes in wind speed or direction that affect aircraft performance during takeoff and landing.

Operational Utility: Critical safety parameter for takeoff and landing operations. Enables pilots to anticipate performance-degrading conditions. Essential for go-around decision-making. Small aircraft and helicopters particularly vulnerable.
Turbulence (500hPa, 300hPa, 200hPa)

Source: Numerical weather prediction model

Altitudes: ~18,000 ft, ~30,000 ft, ~38,000 ft

Forecast Range: 0-240 hours (6-hour intervals)

Description: Atmospheric turbulence forecasts at multiple cruise altitudes showing areas of expected rough air.

Operational Utility: Critical for flight planning at different cruise altitudes. Identifies clear air turbulence (CAT) areas near jet streams. Reduces passenger injuries from unexpected turbulence. Supports optimal cruise altitude selection.
Icing (600hPa, 500hPa, 400hPa)

Source: Numerical weather prediction model

Altitudes: ~14,000 ft, ~18,000 ft, ~24,000 ft

Forecast Range: 0-240 hours (6-hour intervals)

Description: Aircraft icing potential forecast showing areas where supercooled water droplets can freeze on aircraft surfaces.

Operational Utility: Critical safety layer for operations in clouds with temperatures between 0°C and -20°C. Essential for aircraft not equipped for known icing conditions. Supports de-icing/anti-icing fluid selection.

Forecast Layers Precipitation & Cloud Forecasts

Rain

Source: High-resolution numerical weather model

Forecast Range: 0-240 hours (6-hour intervals)

Resolution: Typically 3-12 km

Description: Quantitative precipitation forecast showing expected rainfall accumulation over 6-hour periods with intensity color-coding.

Operational Utility: Essential for aviation weather avoidance and alternate planning. Critical for flood forecasting and reservoir management. Agricultural sector uses for irrigation scheduling.
Simulated Radar Reflectivity

Source: Model-simulated radar reflectivity

Forecast Range: 0-240 hours (6-hour intervals)

Description: Simulated radar return showing precipitation intensity and type, mimicking what weather radar would observe.

Operational Utility: Bridges gap between current radar observations and future conditions. Enables pilots to anticipate convective development along route. Supports severe weather forecasting.
Clouds / Cloud Layer / Convective Clouds

Source: Numerical weather model

Forecast Range: 0-240 hours (6-hour intervals)

Description: Total cloud cover, layered cloud structure, and cumulonimbus (CB) cloud forecasts for thunderstorm identification.

Operational Utility: Critical for VFR operations planning. Convective clouds layer identifies thunderstorm areas requiring 20+ nm avoidance. Solar energy sector uses for PV output forecasting.

Wind/Solar Power Wind/Solar Power

Wind Energy Potential

Source: Wind power density calculation from numerical model

Altitude: Hub height (typically 80-120 meters)

Forecast Range: 0-240 hours (6-hour intervals)

Description: Wind energy potential expressed as power density (W/m²) available for wind turbine generation.

Operational Utility: Critical for wind farm operators for generation forecasting and grid integration planning. Enables power traders to optimize day-ahead market bidding. Supports maintenance scheduling.
Solar Power Potential

Source: Solar irradiance calculation from cloud cover and atmospheric parameters

Forecast Range: 0-240 hours (6-hour intervals)

Description: Solar energy potential available at Earth's surface accounting for cloud cover, atmospheric aerosols, and solar geometry.

Operational Utility: Essential for photovoltaic power plant generation forecasting. Enables solar energy traders for market participation. Critical for rooftop solar performance prediction.

Air Quality Air Quality

PM2.5 (Particulate Matter ≤2.5 μm)

Source: Air quality dispersion model

Forecast Range: 0-240 hours (6-hour intervals)

Unit: μg/m³ (micrograms per cubic meter)

Description: Fine particulate matter forecast showing concentration of particles with diameter ≤2.5 micrometers, capable of deep lung penetration.

Operational Utility: Critical for public health advisories and air quality index (AQI) forecasting. Used by health departments for vulnerable population warnings. Supports outdoor activity and sports event planning.
PM10 (Particulate Matter ≤10 μm)

Source: Air quality dispersion model

Forecast Range: 0-240 hours (6-hour intervals)

Unit: μg/m³

Description: Coarse particulate matter forecast including dust, pollen, and mold spores.

Operational Utility: Essential for dust storm monitoring and forecasting. Used by mining and quarrying operations for environmental compliance. Critical for agricultural burning impact assessment.

District Level Forecast & Impact

Weather Impact Map

Source: Numerical weather model (multi.json) + GADM district boundaries

Coverage: All 700+ districts in India

Forecast Range: 0-120 hours (6-hour intervals)

Parameters Assessed: Temperature, Total Precipitation, Convective Precipitation, Wind Speed, Wind Gust

Description: District-level weather impact assessment system that evaluates multiple weather parameters against predefined thresholds to classify impact severity. Districts are color-coded (Red=High, Orange=Moderate, Green=Low, Transparent=No Impact).

Operational Utility:
  • Disaster Management: Early warning system for district collectors and SDMA/NDMA for pre-positioning relief resources
  • Agriculture: Crop protection advisories, irrigation scheduling, harvest timing decisions
  • Transportation: Route planning for goods transport, avoiding weather-affected areas
  • Aviation: Identifying areas of severe weather affecting general aviation and helicopter operations
  • Public Safety: Issuing heat/cold wave warnings, flood alerts at district level
  • Tourism: Travel advisories and event planning
  • Health Services: Preparing for weather-related emergencies (heatstroke, hypothermia, flood-related diseases)
  • Power Sector: Anticipating demand spikes due to extreme temperatures
Detailed District Forecast

Access: Click on district → "View Detailed Forecast" button

Forecast Period: All available hourly data up to 120 hours

Description: Comprehensive forecast tray showing daily summary statistics and time-series charts for the selected district.

Components:

  • Daily Summary Cards: Day-by-day breakdown with Avg/Max/Min Temperature, Total Precipitation, Max Wind, Cloud Cover
  • Cloud Cover Chart: Line chart with area fill showing cloud percentage trend
  • Wind Chart: Wind speed line, gust excess bars, and direction arrows
  • Precipitation & Temperature Chart: Combined chart with precipitation bars (total and convective) and temperature line
Operational Utility: Enables detailed planning for any district-specific activity. Daily summaries provide quick overview for multi-day planning. Hourly resolution charts support precise timing decisions. Particularly valuable for agricultural operations, outdoor events, and emergency response planning.

Data Sources & Attribution

Disclaimer

VayuMet Weather is an information tool designed to support weather-related decision-making. While every effort is made to ensure accuracy and timeliness of data, users should:

For Aviation Operations: This platform does NOT replace official aviation weather briefings, NOTAMs, or flight planning services required by regulations. Pilots in Command retain full responsibility for flight safety decisions.

For District Impact Forecasts: Impact assessments are based on model data and predefined thresholds. Actual conditions may vary. Always refer to official IMD warnings and local authorities for emergency decisions.

Contact, Support & Feedback

For technical support, bug reports, feature requests, or feedback about VayuMet Weather, please contact:

Email: contact@vayumetweather.com
Website: www.vayumetweather.com; www.vayumetweather.in
Documentation: info.html

We continuously work to improve the platform and welcome your input to make VayuMet Weather more useful for the aviation and meteorological community.

Version Information

Version: 2.1.0
Release Date: December 2025
Last Updated:

Version History

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