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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.


Nearby Weather Stations - Royan Distance
Phare de Chassiron 65.0 km
La Rochelle Airport 65.5 km
Cognac - Châteaubernard Air Base 78.1 km
Bordeaux/Merignac 94.8 km
Niort 103.8 km
Cap Ferret 112.5 km
Cazaux 121.3 km
La Roche-sur-Yon 127.3 km
Biscarrosse 134.4 km
Angoulême - Cognac Intl. Airport 138.4 km
Poitiers/Biard 181.8 km
Nantes Atlantique Airport 182.9 km
Saint-Sauveur 189.8 km
Bergerac/Roumanier 192.5 km
Mont-de-Marsan 198.1 km
Angers 212.1 km
Dax 214.6 km
Saint-Nazaire 227.8 km
Angers 230.1 km
Agen/La Garenne 240.9 km
Limoges/Bellegarde 246.0 km
Biarritz/Anglet 246.1 km
Pau Pyrénées Airport 257.7 km
Ciboure 258.3 km
San Sebastian / Fuenterrabia 265.3 km
Laval Airport 270.5 km
Aérodrome d'Auch 280.5 km
Tours/St Symphorien 281.2 km
San Sebastian / Igueldo 281.2 km
Brive-la-Gaillarde 282.2 km
Rennes- Saint-Jacques Airport 284.3 km
Gourdon 285.8 km
Brive- Souillac Airport 285.9 km
Le Mans/Arnage 291.3 km
Tarbes/Ossun 293.6 km
Le Talut 308.1 km
Elgoibar 309.7 km
Montauban 320.1 km
Ilundain 321.3 km
Pamplona 324.5 km
Bilbao/Sondica 332.8 km
Punta Galea Golf 334.7 km
Guéret Airport 336.1 km
Châteauroux 337.2 km
Alencon/Valframbert 337.3 km
Aérodrome de Blois 338.1 km
Toulouse/Blagnac 345.1 km
Onton 349.0 km
Muret - Lherm Aerodrome 349.9 km
Dinard/Pleurtuit 350.2 km
Lorient South Brittany Airport 353.1 km
Romorantin-Lanthenay 355.7 km
Groix 357.2 km
Vitoria-Gasteiz 358.2 km
Saint-Girons 374.2 km
Logroño 381.6 km
Châteaudun 381.8 km
Bardenas Reales 383.3 km
Saint-Brieuc Armor 383.3 km
Arties 387.1 km
Santander 390.2 km
Aurillac 390.8 km
Aérodrome d'Albi 396.6 km
Santander / Parayas 396.7 km
Huesca 400.6 km
Caen 402.0 km
Orléans 406.5 km
Bourges 409.7 km
Rodez- Aveyron Airport 412.0 km
Jersey Airport 421.7 km
Chartres 423.2 km
Castres-Mazamet Airport 433.6 km
Deauville-Saint-Gatien AP 437.5 km
Deauville-Saint-Gatien 437.7 km
Quimper 438.0 km
Avord 438.2 km
Zaragoza 439.6 km
Lannion Airport 442.5 km
Penmarch 445.0 km
Sainte-Adresse 448.8 km
Ploumanac'h 449.9 km
Cherbourg - Maupertus Airport 451.7 km
Evreux/Fauville 452.8 km
Le Havre/Octeville 452.9 km
La Seu d'Urgell Airport 453.7 km
Morlaix/Ploujean 455.2 km
Carcassonne 456.3 km
Soria 457.8 km
Guernsey Airport 459.8 km
Burgos / Villafria 464.2 km
Bujaraloz 465.3 km
Cap de la Hague 467.5 km
Alderney Channel Is 474.9 km
Landivisiau 476.2 km
Lleida 478.9 km
Lanvéoc/Poulmic 483.2 km
Rouen/Boos 485.6 km
Trappes 486.8 km
Guipavas 492.4 km
Toussus-le-Noble 492.6 km