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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 - Llyn Trawsfynydd Distance
Capel Curig 22.2 km
Bala 39.7 km
Lake Vyrnwy 54.6 km
Trawscoed 61.1 km
Rhyl 62.0 km
Raf Mona 62.9 km
Valley 77.3 km
Aberdaron 90.0 km
Sennybridge 99.0 km
Hawarden 109.8 km
Aberporth 110.5 km
Crosby 117.3 km
Woodvale 123.4 km
Liverpool AP 129.9 km
Shobdon 138.0 km
Blackpool Airport 139.0 km
Pembrey Burrows 140.0 km
Shawbury 141.4 km
Mumbles 148.2 km
Warton Aerodrome Airport 150.2 km
Isle of Man Airport 152.7 km
Walney 155.1 km
Credenhill 155.4 km
St Athan 175.7 km
Cardiff Airport 180.0 km
Rostherne 180.6 km
Milford Haven 182.2 km
St Bees Head 183.2 km
Cosford 186.1 km
Manchester 190.4 km
Stonyhurst 193.4 km
RM Chivenor 203.2 km
Liscombe 205.2 km
Keswick 208.7 km
Dundrennan 211.4 km
Filton 215.0 km
Bristol / Lulsgate 216.2 km
Thorncliffe 219.4 km
Shap 225.8 km
Pershore 227.3 km
Gloucestershire Airport 227.5 km
North Wyke 237.0 km
Dunkeswell Airport 239.9 km
RAF West Freugh 244.0 km
Exeter Airport 247.6 km
Birmingham Airport 250.0 km
Warcop Range 250.6 km
Carlisle 250.7 km
Bingley 251.2 km
Coleshill 254.7 km
Yeovil 256.0 km
Great Dun Fell 258.0 km
Carlisle Lake District Airport 258.8 km
Emley Moor transmitting station 264.3 km
Dublin Airport 264.6 km
MoD Lyneham 266.5 km
Fairford Airport 274.9 km
RAF Little Rissington 275.5 km
Leeds Bradford Intl. Airport 276.0 km
Cardinham 278.5 km
Eskdalemuir 279.5 km
Dublin Csmt Aero 281.8 km
Coal Aston Airfield 282.8 km
Plymouth MtBatten 283.6 km
Spadeadam 284.3 km
Spadeadam II 284.3 km
Belfast/Harbour 287.5 km
East Midlands Airport 290.6 km
RAF Brize Norton 291.9 km
Johnstown Castle 293.8 km
Church Lawford 296.6 km
Cornwall Airport Newquay 297.5 km
Nottingham/Watnall 298.8 km
Prestwick 299.4 km
Drumalbin 302.6 km
Larkhill 303.5 km
Leeming 309.2 km
MoD Boscombe Down 310.2 km
Isle of Portland 312.1 km
London Oxford Airport 314.2 km
Topcliffe 318.5 km
Belfast Intl. Airport 320.8 km
Glenanne 321.7 km
Redesdale Camp 323.0 km
Linton-On-Ouse 324.4 km
Middle Wallop 327.5 km
Albemarle 328.5 km
Oak Park 330.3 km
Durham Tees Valley Airport 331.5 km
Bournemouth 331.7 km
Doncaster Airport 332.4 km
Glasgow Airport 334.3 km
Camborne 335.2 km
Glasgow Bishopton 339.7 km
Edinburgh Gogarbank 342.3 km
Machrihanish 343.0 km
Newcastle Airport 343.6 km
Edinburgh Airport 345.0 km
RNAS Culdrose 345.4 km
Benson 346.8 km