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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 - Hoorn-a Sea Distancia
Hoorn-a Sea 0.2 km
Wijk aan Zee 68.0 km
K14-fa-1c Sea 70.1 km
De Kooy Airfield 70.3 km
Voorschoten 91.9 km
Vlieland 93.0 km
Berkhout 97.1 km
Amsterdam-Schiphol 97.6 km
Hook of Holland 103.8 km
K13-A 109.1 km
P11-b Sea 110.3 km
Rotterdam The Hague Airport 112.4 km
L9-ff-1 Sea 118.9 km
Le Goeree 121.7 km
Stavoren 133.6 km
F16-a Sea 134.1 km
Cabauw 136.8 km
Euro Platform 141.1 km
Terschelling Hoorn 143.3 km
De Bilt 146.4 km
Wilhelminadorp 156.1 km
Lelystad Airport 161.1 km
Herwijnen 161.1 km
Woensdrecht 164.1 km
J6-a Helipad Oil Platform 167.8 km
Gilze en Rijen 173.3 km
Vlissingen 174.0 km
Stabroek 178.3 km
Leeuwarden 183.3 km
Westdorpe 191.4 km
Antwerpen / Deurne 193.8 km
Marknesse 194.4 km
Zeebrugge 203.8 km
D15-fa-1 Sea 206.8 km
Sint-Katelijne-Waver 208.6 km
Awg-1 Sea 209.4 km
Retie 212.7 km
Deelen 214.7 km
Eindhoven 215.3 km
Melle 218.2 km
Volkel Air Base 222.5 km
F3-FB1 224.2 km
Gavere 226.7 km
Brussels Airport 227.9 km
Lauwersoog 234.8 km
Schaffen 235.9 km
Uccle 236.3 km
Ostend Airport 238.3 km
Heino 240.8 km
Kleine-Brogel 243.2 km
Beauvechain 250.1 km
Beitem 251.2 km
Ell 262.0 km
Chièvres 262.3 km
Koksijde 262.6 km
Diepenbeek 264.9 km
Weeze Airport 266.2 km
Ernage 267.5 km
Hoogeveen 269.7 km
Kalkar 269.7 km
Groningen-Eelde 271.9 km
Charleroi / Gosselies 274.0 km
Arcen 277.0 km
A12-cpp Sea 280.1 km
Lille Airport 285.8 km
Maastricht-Beek 286.8 km
Dunkirk 289.7 km
Liege / Bierset 290.1 km
Bocholt 291.2 km
Borkum Airport 293.8 km
Eibergen 293.8 km
Geilenkirchen 302.2 km
Florennes 303.0 km
Orsbach 314.2 km
Twente 314.5 km
Dourbes 316.6 km
Norwich Weather Centre 320.3 km
Mönchengladbach Airport 321.9 km
Mönchengladbach Airport 321.9 km
Baerl 323.8 km
Ahaus 324.2 km
Humain 325.3 km
Spa 333.9 km
Nieuw-Beerta 335.4 km
Weybourne 337.1 km
Mont Rigi 341.1 km
Düsseldorf Airport 342.4 km
Norderney 345.6 km
Emden Airport 346.7 km
St. Hubert/Ardennen 348.8 km
Charleville-Mézières 351.9 km
Meppen 353.3 km
Elsenborn 353.6 km
Fliegerhorst Meppen 354.2 km
Lingen 354.3 km
Nideggen-Schmidt 354.8 km
Essen 355.6 km
Manston 357.1 km
Saint-Quentin 360.2 km
Nörvenich 362.7 km

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