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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.


Estaciones meteorológicas cercanas - Chemoulin Distancia
Saint-Nazaire 17.5 km
Saint-Sauveur 59.4 km
Nantes Atlantique aeropuerto 77.5 km
Le Talut 102.5 km
Rennes Saint-Jacques aeropuerto 112.3 km
La Roche-sur-Yon 118.0 km
Lorient South Brittany aeropuerto 131.1 km
Groix 141.4 km
Dinard/Pleurtuit 152.4 km
Saint-Brieuc Armor 157.0 km
Phare de Chassiron 164.9 km
La Rochelle Aeropuerto 170.2 km
Angers 189.6 km
Laval Aeropuerto 194.7 km
Lannion Aeropuerto 212.8 km
Ploumanac'h 220.2 km
Jersey Aeropuerto 220.9 km
Quimper 223.7 km
Angers-Loire aeropuerto 224.2 km
Morlaix/Ploujean 227.1 km
Niort 234.8 km
Penmarch 238.5 km
Guernsey aeropuerto 246.9 km
Landivisiau 251.5 km
Lanvéoc/Poulmic 265.7 km
Guipavas 271.7 km
Alderney Channel Is 276.5 km
Brignogan-Plage 277.8 km
Cabo de la Hague 279.3 km
Cognac - Châteaubernard Air Base 281.3 km
Cherbourg - Maupertus aeropuerto 284.3 km
Punta de Raz 285.1 km
Le Mans/Arnage 289.0 km
Poitiers/Biard 298.3 km
Alencon/Valframbert 298.7 km
Caen 299.2 km
Cabo Ferret 312.0 km
Bordeaux/Merignac 322.0 km
Angoulême - Cognac aeropuerto 326.8 km
Cazaux 327.3 km
Biscarrosse 333.0 km
Ouessant 336.1 km
Tours/St Symphorien 337.8 km
Deauville-Saint-Gatien aeropuerto 362.9 km
Deauville-Saint-Gatien 363.0 km
Sainte-Adresse 364.8 km
Isla de Pórtland 365.6 km
Le Havre/Octeville 368.7 km
Punta de St. Catherine 389.0 km
Aérodrome de Blois 394.1 km
Bournemouth 398.3 km
Plymouth MtBatten 401.8 km
Exeter Aeropuerto 408.5 km
Bergerac/Roumanier 413.1 km
Limoges/Bellegarde 416.3 km
Dunkeswell Aeropuerto 416.6 km
Dax 417.4 km
Mont-de-Marsan 420.1 km
Southampton Aeropuerto 420.1 km
Châteaudun 420.4 km
Yeovil 420.6 km
Thorney Island 427.0 km
Biarritz/Anglet 427.7 km
North Wyke 431.2 km
Ciboure 432.5 km
San Sebastián / Fuenterrabía 434.6 km
Punta Galea Golf 436.5 km
San Sebastián / Igueldo 437.8 km
Evreux/Fauville 438.9 km
MoD Boscombe Down 441.8 km
Bilbao/Sondica 442.8 km
Middle Wallop 443.3 km
Romorantin-Lanthenay 444.0 km
Onton 444.2 km
Chartres 444.7 km
Larkhill 444.8 km
Elgóibar 447.7 km
Cardinham 448.7 km
Santander 449.0 km
Châteauroux 451.7 km
Liscombe 451.8 km
Rouen/Boos 455.7 km
Santander / Parayas 455.9 km
Culdrose Airfield 456.8 km
Brighton City aeropuerto 459.2 km
Orleans 459.8 km
Brístol aeropuerto 463.8 km
Newquay Cornwall aeropuerto 465.8 km
Agen/La Garenne 468.9 km
RAF Odiham 470.6 km
Camborne 471.8 km
Chivenor Airfield 474.9 km
Lyneham Airfield 476.2 km
Pau-Pirineos aeropuerto 477.2 km
Cardiff Aeropuerto 477.2 km
Brive-la-Gaillarde 480.0 km
St Athan 480.8 km
Farnborough 481.9 km
Dieppe 483.3 km
Brive- Souillac aeropuerto 487.0 km