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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 - Porthmadog Distance
Capel Curig 20.1 km
Raf Mona 43.5 km
Bala 56.6 km
Vallée 57.3 km
Rhyl 70.1 km
Lake Vyrnwy 74.1 km
Trawscoed 74.4 km
Aberdaron 76.2 km
Aberporth 110.2 km
Sennybridge 116.0 km
Hawarden 123.8 km
Crosby 126.1 km
Aéroport du Ronaldsway 134.9 km
Liverpool AP 142.2 km
Blackpool Aéroport 144.6 km
Pembrey Burrows 145.9 km
Walney 154.9 km
Warton Aerodrome (Aéroport) 157.2 km
Shobdon 157.4 km
Shawbury 159.3 km
Mumbles 159.6 km
Credenhill 175.5 km
St Bees Head 176.5 km
Milford Haven 180.0 km
St Athan 191.2 km
Rostherne 193.6 km
Cardiff Aéroport 196.2 km
Dundrennan 200.4 km
Cosford 201.9 km
Cosford 201.9 km
Stonyhurst 202.4 km
Manchester 204.1 km
Cosford 204.5 km
Keswick 206.9 km
Royal Marines Base Chivenor 212.9 km
Liscombe 219.6 km
RAF West Freugh 227.1 km
Shap 228.2 km
Thorncliffe 234.4 km
Bristol (Aéroport) 235.3 km
Dublin Aéroport 245.9 km
Gloucestershire Aéroport 246.9 km
Pershore 247.0 km
Carlisle 248.5 km
North Wyke 248.8 km
Warcop Range 254.4 km
Dunkeswell (Aéroport) 255.6 km
Great Dun Fell 260.9 km
Exeter Aéroport 262.4 km
Bingley 262.7 km
Dublin Csmt aérien 263.7 km
Belfast/port 267.6 km
Birmingham Aéroport 268.7 km
Coleshill 273.3 km
Yeovil 274.7 km
Eskdalemuir 274.7 km
Émetteur d'Emley Moor 277.5 km
Johnstown Castle 280.5 km
Spadeadam II 284.7 km
Spadeadam 284.7 km
Cardinham 284.8 km
Prestwick 284.8 km
RAF Lyneham 286.1 km
Leeds-Bradford (Aéroport) 287.5 km
Drumalbin 293.2 km
Plymouth MtBatten 293.7 km
Fairford Aéroport 294.3 km
RAF Little Rissington 294.7 km
Coal Aston Airfield 297.2 km
Belfast (Aéroport) 301.5 km
Newquay Cornouailles (Aéroport) 301.6 km
Glenanne 301.8 km
Midlands de l'Est Aéroport 307.3 km
RAF Brize Norton 311.2 km
Oak Park 314.0 km
Église Lawford 314.5 km
Nottingham/Watnall 315.3 km
Leeming 318.5 km
Glasgow Aéroport 321.2 km
Larkhill 323.5 km
Camp de Redesdale 323.8 km
Machrihanish 324.4 km
Glasgow Bishopton 326.5 km
Topcliffe 328.8 km
MoD Boscombe Down 330.2 km
Île de Portland 330.5 km
Albemarle 332.4 km
Aéroport d'Oxford Kidlington 333.7 km
Ballypatrick Fst 335.2 km
Édimbourg Gogarbank 335.5 km
Portglenone 335.6 km
Linton-Sur-Ouse 336.0 km
Linton-Sur-Ouse 336.0 km
Édimbourg Aéroport 337.7 km
Camborne 337.9 km
Durham Tees Valley (Aéroport) 339.8 km
Waterford Aéroport 346.3 km
Doncaster Aéroport 346.8 km
Middle Wallop 347.5 km
Newcastle (Aéroport) 348.5 km