Data Sources & Forecasting Methodology
At Tomorrow Weather, accuracy and meteorological integrity are the cornerstones of our platform. We integrate open scientific data from leading national laboratories, orbital satellites, and land observation arrays.
1. Numerical Weather Prediction (NWP) Models
Our weather pipelines draw from high-performance supercomputing models run by national meteorological services, blended and post-processed for micro-scale accuracy:
NOAA HRRR (High-Resolution Rapid Refresh)
3 km grid resolution, hourly updating model specialized for short-term thunderstorms, wind gusts, and localized precipitation across the contiguous US.
NOAA GFS (Global Forecast System)
Synoptic global atmospheric model providing the backbone for medium-range 7-day to 16-day synoptic weather outlooks.
ECMWF IFS (European Centre)
World-renowned operational medium-range forecasting system recognized globally for outstanding temperature and storm trajectory skill scores.
Open-Meteo Engine
Open-source weather API infrastructure delivering sub-millisecond JSON query caching, solar radiation models, and elevation corrections.
2. Geographic & Topographic Foundation
To guarantee hyper-local forecasts for 244,000+ communities rather than generic regional estimates, our platform leverages official US geospatial databases:
- USGS Geographic Names Information System (GNIS): Official federal repository of domestic geographic names and precise latitude/longitude centroids for all 50 states and territories.
- US Census Bureau TIGER/Line Database: Authoritative boundary definitions for all 3,152 counties, parishes, and independent municipalities.
- Digital Elevation Models (SRTM & Copernicus DEM): Used to calculate adiabatic lapse rates, valley temperature inversions, and altitude-specific oxygen and pressure calculations in mountainous regions.
3. Air Quality, Marine & Snow Telemetry
Air Quality & Aerosols (AQI):
Derived from the Copernicus Atmosphere Monitoring Service (CAMS) and normalized to EPA standards for particulate matter (PM2.5, PM10), Nitrogen Dioxide (NO₂), Carbon Monoxide (CO), and Ozone (O₃).
Coastal Sea Surface Temperatures:
Multichannel infrared and microwave radiometer satellite observations curated by the NOAA National Data Buoy Center (NDBC) and satellite sea surface temperature analyses.
Mountain Snow Depths:
Blended from automated SNOTEL (Snow Telemetry) stations in the western mountain ranges and operational snowpack hydrological analyses.
Continuous Model Validation
Meteorological data is constantly compared against real-time ground truth METAR station observations. While computational models represent best scientific estimates, unpredictable mesoscale phenomena may produce localized differences.