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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 - Caernarfon Distancia
Raf Mona 18.6 km
Valley 32.4 km
Capel Curig 37.3 km
Aberdaron 64.9 km
Bala 80.1 km
Rhyl 85.5 km
Trawscoed 94.5 km
Lake Vyrnwy 98.7 km
la Isla de Man aeropuerto 113.1 km
Aberporth 115.9 km
Sennybridge 138.8 km
Crosby 139.7 km
Hawarden 142.9 km
Blackpool Aeropuerto 154.1 km
Isla Walney 157.3 km
Pembrey Burrows 157.6 km
Liverpool aeropuerto 159.3 km
Warton Aerodrome aeropuerto 168.3 km
St Bees Head 170.0 km
Mumbles 176.8 km
Milford Haven 181.4 km
Shawbury 181.9 km
Shobdon 182.6 km
Dundrennan 187.6 km
Credenhill 200.7 km
RAF West Freugh 205.5 km
Keswick 205.7 km
Rostherne 211.3 km
St Athan 213.1 km
Stonyhurst 214.9 km
Cardiff Aeropuerto 218.6 km
Mánchester 222.1 km
Dublín Aeropuerto 223.3 km
Cosford 225.1 km
Cosford 225.1 km
Cosford 227.7 km
Chivenor Airfield 228.0 km
Shap 232.6 km
Liscombe 239.5 km
Dublin Csmt Aero 241.9 km
Belfast/Harbour 242.6 km
Carlisle 247.1 km
Thorncliffe 254.4 km
Brístol aeropuerto 259.8 km
Warcop Range 260.4 km
Great Dun Fell 265.6 km
Johnstown Castle 265.8 km
North Wyke 265.9 km
Prestwick 266.9 km
Eskdalemuir 269.2 km
Pershore 271.6 km
Gloucestershire Aeropuerto 272.0 km
Belfast aeropuerto 276.3 km
Glenanne 276.9 km
Dunkeswell Aeropuerto 277.1 km
Bingley 277.6 km
Drumalbin 282.1 km
Exeter Aeropuerto 282.9 km
Spadeadam 286.1 km
Spadeadam II 286.1 km
Birmingham Aeropuerto 292.1 km
Emley Moor transmitting station 294.2 km
Oak Park 294.8 km
Cardinham 295.4 km
Coleshill 296.5 km
Yeovil 298.7 km
Machrihanish 300.9 km
Leeds Bradford aeropuerto 302.5 km
Glasgow Aeropuerto 304.5 km
Plymouth MtBatten 308.9 km
Glasgow Bishopton 309.2 km
Newquay Cornwall aeropuerto 309.6 km
Portglenone 310.4 km
Ballypatrick Fst 310.4 km
Lyneham Airfield 311.3 km
Coal Aston Airfield 316.3 km
Fairford Aeropuerto 319.4 km
RAF Little Rissington 319.6 km
Redesdale Camp 325.8 km
Edinburgh Gogarbank 327.0 km
Región de las Tierras Medias Orientales Aeropuerto 328.8 km
Edimburgo Aeropuerto 329.1 km
Leeming 330.8 km
Waterford Aeropuerto 331.0 km
Lough Fea 333.8 km
Nottingham/Watnall 336.0 km
RAF Brize Norton 336.1 km
Church Lawford 337.9 km
Albemarle 338.3 km
Topcliffe 342.2 km
Camborne 344.0 km
Mullingar 347.4 km
Larkhill 348.7 km
Linton-On-Ouse 350.7 km
Linton-On-Ouse 350.7 km
Teesside aeropuerto 350.9 km
Ballyhaise 352.6 km
Isla de Pórtland 354.2 km
Charterhall 354.7 km
Newcastle upon Tyne aeropuerto 355.3 km