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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 - Nefyn Distance
Aberdaron 29.3 km
Valley 35.2 km
Raf Mona 39.5 km
Capel Curig 67.5 km
Aberporth 88.9 km
Trawscoed 91.0 km
Bala 104.0 km
Rhyl 117.9 km
Lake Vyrnwy 118.6 km
Isle of Man Airport 128.3 km
Pembrey Burrows 136.1 km
Sennybridge 138.9 km
Milford Haven 149.1 km
Mumbles 162.9 km
Hawarden 172.6 km
Crosby 173.2 km
Blackpool Airport 189.1 km
Liverpool AP 190.8 km
Walney 192.8 km
Shobdon 197.0 km
Dublin Airport 200.8 km
St Bees Head 202.6 km
Warton Aerodrome Airport 203.0 km
Shawbury 206.5 km
St Athan 208.0 km
RM Chivenor 209.4 km
Credenhill 213.2 km
Cardiff Airport 214.9 km
Dundrennan 215.1 km
Dublin Csmt Aero 217.2 km
RAF West Freugh 218.7 km
Liscombe 229.4 km
Johnstown Castle 232.2 km
Belfast/Harbour 239.3 km
Keswick 240.3 km
Rostherne 242.3 km
Cosford 248.3 km
Cosford 248.3 km
Stonyhurst 249.2 km
North Wyke 250.1 km
Cosford 250.8 km
Manchester 252.9 km
Glenanne 263.6 km
Bristol / Lulsgate 264.0 km
Oak Park 265.5 km
Shap 268.2 km
Belfast Intl. Airport 270.1 km
Cardinham 270.3 km
Dunkeswell Airport 270.6 km
Exeter Airport 273.4 km
Carlisle 281.6 km
Newquay Airport 281.6 km
Thorncliffe 283.1 km
Gloucestershire Airport 286.6 km
Prestwick 286.8 km
Plymouth MtBatten 289.6 km
Pershore 289.8 km
Warcop Range 295.9 km
Waterford Airport 297.8 km
Yeovil 300.1 km
Great Dun Fell 301.2 km
Eskdalemuir 301.7 km
Portglenone 304.2 km
Machrihanish 306.9 km
Ballypatrick Fst 309.7 km
Drumalbin 310.4 km
Bingley 310.7 km
Camborne 314.2 km
Birmingham Airport 314.5 km
Coleshill 319.3 km
Spadeadam II 321.3 km
Spadeadam 321.3 km
RAF Lyneham 322.8 km
Lough Fea 323.5 km
Mullingar 323.7 km
Emley Moor transmitting station 326.1 km
Glasgow Airport 326.3 km
RNAS Culdrose 326.6 km
Glasgow Bishopton 330.0 km
Ballyhaise 333.6 km
Fairford Airport 333.9 km
Leeds Bradford Airport 335.6 km
RAF Little Rissington 336.2 km
Coal Aston Airfield 346.0 km
RAF Brize Norton 352.2 km
Isle of Portland 353.6 km
East Midlands Airport 355.1 km
Edinburgh Gogarbank 357.3 km
Larkhill 358.6 km
Edinburgh Airport 359.3 km
Church Lawford 360.3 km
Islay/Port Ellen 360.7 km
Redesdale Camp 361.0 km
Nottingham/Watnall 363.6 km
Leeming 365.2 km
MoD Boscombe Down 365.2 km
Magilligan 366.2 km
Albemarle 373.9 km
Eglinton Airport 375.3 km
Thomastown 375.8 km