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What are the sources for WeatherOnline forecasts?


The WeatherOnline forecasts are created by using a MOS system developed in-house with the most current US weather services model data (GFS). The statistical methods of the Model-Output-Statistic (MOS)-System were developed in cooperation with the Meteorological Department of the University of Bonn.

What is a MOS-System?


A Model-Output-Statistic (MOS)-System combines the data of the weather forecast model and the locally recorded data for any given point by transforming the model data from a coarse grid to detailed small scale areas.
In order to do so, one needs a large volume of past model forecast data as well as the corresponding recorded data for any given location. The MOS-System relates these two sets of data in an optimized fashion allowing development of the local weather forecast by using the most current model forecast.

What are the time intervals used in the temperature and icons of the local forecasts?


The forecasted maximum temperature always refers to a 12hour window from 6am to 6om local time.
The forecasted minimum temperature always refers to the 12hour window from 6pm of the day before the forecast day to 6 am of the forecast day.
The weather icon for the morning refers to the time between 6am and 12pm local time, the icon for the afternoon is valid from 12am to 6pm local time and the evening icon refers to the time from 6pm to 12am local time.

How often are the current weather conditions and forecasts updated?


The current weather information as well as the satellite images are updated every 30 minutes whereas the radar images are being updated every 15 minutes.
The local weather forecasts as well as the weather charts are updated 8 times a day. The updates start at 2 am CEST or 3 am CEST depending on daylight saving time and continue on a three hourly bases.


Stations météo à proximité - Romilly-sur-Seine Distance
Troyes - Barberey (Aéroport) 38.8 km
Aéroport Châlons-Vatry 58.6 km
Auxerre 78.6 km
Reims en Champagne (Aéroport) 92.7 km
Melun 115.8 km
Saint Dizier/Robinson 132.6 km
Paris-Charles-de-Gaulle (Aéroport) 143.7 km
Paris-Orly (Aéroport) 150.4 km
Paris-Le Bourget (Aéroport) 151.2 km
Saint-Quentin 157.2 km
Creil 157.5 km
Parc Montsouris 157.6 km
Villacoublay/Velizy 171.4 km
Charleville-Mézières 175.3 km
Nevers-Fourchambault (Aéroport) 179.9 km
Toussus-le-Noble 181.5 km
Trappes 191.6 km
Langres Aéroport 194.6 km
Cormeilles 198.3 km
Méaulte 198.7 km
Albert Aéroport 199.0 km
Avord 200.2 km
Dourbes 203.0 km
Dijon-Bourgogne (Aéroport) 205.0 km
Beauvais/Tille 208.0 km
Florennes 218.7 km
Bourges 219.0 km
Orléans 225.1 km
Chièvres 231.0 km
Charleroi/Gosselies 233.1 km
Saint-Yan 233.8 km
Lille-Lesquin (Aéroport) 240.1 km
Buzenol 241.9 km
Chartres 246.8 km
Tavaux 249.6 km
Dole Tavaux 249.7 km
Nancy/Ochey 251.2 km
St Hubert/Ardennen 253.1 km
Ernage 253.4 km
Humain 254.4 km
Romorantin-Lanthenay 261.2 km
Vichy/Charmeil 261.6 km
Châteaudun 264.2 km
Uccle 265.0 km
Gavere 270.4 km
Mâcon 272.4 km
Beitem 275.2 km
Melle 275.7 km
Beauvechain 275.8 km
Abbeville 277.4 km
Nancy/Essey 281.0 km
Bruxelles Aéroport 281.6 km
Evreux/Fauville 284.2 km
Châteauroux 285.0 km
Metz-Nancy-Lorraine 287.2 km
Besançon 288.5 km
Aérodrome de Blois 293.3 km
Rouen/Boos 298.6 km
Wavre-Sainte-Catherine 299.7 km
Westdorpe 302.2 km
Luxembourg 304.6 km
Luxeuil-les-Bains 305.1 km
Liège/Bierset 306.8 km
Clermont/Aulnat 308.0 km
Anvers/Deurne 311.2 km
Coxyde 311.3 km
Ostende Aéroport 314.6 km
Schaffen 315.6 km
Nennig 319.0 km
Zeebruges 321.5 km
Stabroek 321.8 km
Dunkerque 322.6 km
Le Touquet-Paris-Plage 323.9 km
Guéret Aéroport 324.7 km
Flessingue 328.0 km
Spa 329.2 km
Diepenbeek 330.4 km
Ambérieu-en-Bugey 331.6 km
Dieppe 332.0 km
Woensdrecht 334.7 km
Réthy 335.3 km
St Etienne/Boutheon 335.7 km
Lyon-Bron (Aéroport) 336.6 km
Wilhelminadorp 337.5 km
Berus 341.3 km
Boulogne-sur-Mer 342.3 km
Lyon-Saint-Exupéry (Aéroport) 343.1 km
Mont Rigi 344.2 km
Elsenborn 350.7 km
La Dôle 351.2 km
Tours/St Symphorien 352.9 km
Maastricht-Beek 353.3 km
Kleine-Brogel 354.3 km
Trier/Petrisberg 355.5 km
Schneifelforsthaus 361.5 km
Dorans 361.6 km
Orsbach 361.9 km
La Brévine 363.3 km
Weiskirchen 363.4 km
Nyon (Changins) 363.7 km