The weather depends on lots of different factors: wind speed, cloudiness, pressure, humidity, and others.
All of them can be measured and represented in meters per second, millimeters of mercury, etc. A mathematical weather model is a combination of all these factors. Such models tend to be very complex, powerful computers calculate them. Usually, weather models are provided by national weather services, but sometimes they can also be produced by groups of enthusiasts.
In this guide, we want to introduce you to our models, from which we get forecasts. Windy.app has two main types of forecast predictive models: global — on the map, and local — for a spot. There is also a third type of special global models for individual weather elements.
This is a comparision table and the main features of each model:
|Weather model||Territory||Spatial resolution||Forecast depth||Forecast step||Expected update|
|ECMWF||Global||14 km (8.6 mi)||10 days||1 h||2 times a day|
|ECMWF-ENS||Global||27 km (16.7 mi)||6 days||3 h||once a day|
|GFS / GFS27||Global||27 km (16.7 mi)||10 days||3 h||4 times a day|
|GFS+||Global||27 km (16.7 mi)||10 days||1 h||4 times a day|
|ICON13||Global||13 km (8 mi)||5 days||1 h||2 times a day|
|ICON7||Europe||7 km (4.3 mi)||5 days||1 h||4 times a day|
|NAM||North America||12 km (7.4 mi)||2.5 days||1 h||2 times a day|
|HRRR||North America||3 km (1.8 mi)||1.5 days||1 h||2 times a day|
|WRF8||Europe||8 km (4.9 mi)||3 days||3 h||once a day|
|WRF8||Japan, South Korea||3 km (1.8 mi)||1.5 days||1 h||once a day|
|OS (Open Skiron)||Mediterranean Sea||12 km (7.4 mi)||5 days||3 h||once a day|
|OpenWRF||Mediterranean Sea||4 km (2.4 mi)||2 days||1 h||4 times a day|
|AROME||France||1.25 km (0.7 mi)||1.7 days||1 h||4 times a day|
|MFWAM||Global (waves)||8 km (4.9 mi)||10 days||3 h||once a day|
|MyOcean||Global (sea temp.)||9.24 km (5.7 mi)||10 days||1 h||once a day|
ECMWF weather model, London weather in the Windy.app for iOS
ECMWF (European Centre for Medium-Range Weather Forecasts) is a global weather model created and operated by the European Centre for Medium-Range Weather Forecasts with headquarters in Reading, Berkshire county, United Kingdom, since December 9–10, 1971. The main feature of the model is that it is one the the two leading global weather models on par with GFS from the Unites States. It is also considered the best for precipitation and cloudness.
ECMWF-ENS weather model, Tokyo weather in the Windy.app for iOS
ECMWF-ENS (European Centre for Medium-Range Weather Forecasts Ensemble Model) is a global weather model by the European Centre for Medium-Range Weather Forecasts. Headquarters: Reading, UK. This weather model is also calle EN-ENS or Ensembles weather model.
GFS27 weather model, New York weather in the Windy.app for iOS
GFS27 (Global Forecast System) is a global weather model by the The United States' National Weather Service.
GFS+ weather model, Los Angeles weather in the Windy.app for iOS
GFS+ (Global Forecast System +) is a global weather model by the The United States' National Weather Service. While the GFS27 interpolates data for every dot within a 27 km x 27 km square, its modification GFS+, specially provided by Windy.app specialists, always shows only the maximum result in each square (radius of the spot).
ICON13 weather model, Rio de Janeiro weather in the Windy.app for iOS
ICON13 ((Icosahedral Nonhydrostatic)) is a gloval weather model by the Deutscher Wetterdienst (German National Meteorological Service).
ICON7 weather model, Munich weather in the Windy.app for iOS
ICON7 ((Icosahedral Nonhydrostatic)) is a regional Europe weather model by the Deutscher Wetterdienst (German National Meteorological Service).
NAM weather model, Chicago weather in the Windy.app for iOS
NAM (North American Mesoscale Forecast System) is a regional North America weather model by the The National Centers for Environmental Prediction (NCEP) of the National Oceanic and Atmospheric Administration of the US (NOAA).
HRRR weather modesl, San Francisco weather in the Windy.app for iOS
HRRR (Name: High Resolution Rapid Refresh) is regional North America weather model by the National Oceanic and Atmospheric Administration of the US (NOAA). It provides a great forecast for the continental US, Canada and Mexico based with radars' data — the unique advantage of HRRR. It is assimilated every 15 min over a 1 h period. It gives short-range weather forecasts with pretty good accuracy.
WRF8 weather model, Moscow weather in the Windy.app for iOS
The WRF (Weather Research and Forecasting) is a regional weather model for Europe and East Asea (Japan and South Korea) by the Windy.app based on Open WRF weather model developed by several scientific laboratories in different countries. Using it, Windy.app's calculates a hyperlocal forecast on our servers for Europe and the Mediterranean. Headquarters: New York, USA.
East Asea (Japan and South Korea)
Open Skiron weather model, Athens weather in the Windy.app for iOS
OS (Open Skiron) is a regional Mediterranean weather model by the University of Athens. Headquarters: Athens, Greece.
OpenWRF weather model, Barcelona weather in the Windy.app for iOS
The Open WRF (Open Weather Research and Forecasting) is a regional Mediterranean weather model by the University of Athens and a group of enthusiasts based on the WRF technology. Headquarters: Athens, Greece.
AROME weather model, Paris weather in the Windy.app for iOS
AROME is a regional France and the surrounding territories weather model by the Meteo France (French National Meteorological Service). Headquarters: Paris, France.
MFWAM weather model, Maui, Hawaii, USA, weather in the Windy.app for iOS
MFWAM (Météo-France WAve Model) is a third generation numerical weather forecast model provided by the Météo-France, the French main national meteological service, with headquarters in Paris, France, which use it as the basis of its global wave system. From this model you can get swell forecast for surfing and other water sports and outdoor activities.
My Ocean weather model, Palermo, Sicily, Italy, weather in the Windy.app for iOS
The MyOcean weather model is the world's main model with currents, tides and sea temperature forecasts. These are typically updated once a day and cover oceans, seas and coastal areas but not rivers and lakes, even big ones. The model is part of the Copernicus Marine Service (CMS), which, in turn, is run by the Copernicus Programme, which is the European Union's Earth Observation Programme, looking at our planet and its environment for the ultimate benefit of all European and global citizens.
Get the list to all world's major weather models, including the ones, which are not used in the Windy.app such as UM (United Kingdom Met Office), CFS (Climate Forecast System), ALADIN (Aire Limitée Adaptation Dynamique Développement InterNational), and others.
Updated on July 28, 2022
Text: Windy.app team
Cover photo: Markusspiske / Unsplash