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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 - Merthyr Tydfil Distance
St Athan 37.2 km
Cardiff Airport 37.5 km
Sennybridge 46.3 km
Mumbles 71.1 km
Credenhill 74.1 km
Liscombe 76.8 km
Shobdon 78.8 km
Bristol / Lulsgate 81.9 km
Trawscoed 93.8 km
Dunkeswell Airport 98.0 km
Exeter Airport 110.8 km
Pembrey Burrows 111.3 km
RM Chivenor 113.2 km
Lake Vyrnwy 113.5 km
Yeovil 115.4 km
North Wyke 122.7 km
Bala 132.6 km
Gloucestershire Airport 135.4 km
Aberporth 140.8 km
Shawbury 141.9 km
RAF Lyneham 155.1 km
Cosford 155.3 km
Cosford 155.3 km
Pershore 155.5 km
Cosford 156.7 km
Capel Curig 164.4 km
Hawarden 164.9 km
Isle of Portland 169.4 km
Rhyl 170.3 km
Plymouth MtBatten 174.6 km
Fairford Airport 175.6 km
Larkhill 184.2 km
RAF Little Rissington 186.9 km
Liverpool AP 186.9 km
Milford Haven 187.4 km
MoD Boscombe Down 190.7 km
Aberdaron 191.7 km
Birmingham Airport 198.5 km
Cardinham 199.1 km
RAF Brize Norton 199.1 km
Crosby 199.2 km
Bournemouth 200.7 km
Raf Mona 203.4 km
Coleshill 205.1 km
Middle Wallop 210.6 km
Rostherne 211.5 km
Valley 212.7 km
Manchester 216.5 km
Thorncliffe 218.7 km
Oxford Airport 228.1 km
Blackpool Airport 229.8 km
Warton Aerodrome Airport 230.0 km
Newquay Airport 231.2 km
Church Lawford 237.0 km
Southampton Airport 237.7 km
Benson 252.8 km
Stonyhurst 254.1 km
East Midlands Airport 257.7 km
Alderney Channel Is 259.1 km
St. Catherine's Point 263.2 km
Walney 265.2 km
Guernsey Airport 269.6 km
Camborne 274.7 km
Nottingham/Watnall 274.7 km
RAF Odiham 275.1 km
Cap de la Hague 275.2 km
Coal Aston Airfield 277.5 km
RNAS Culdrose 278.9 km
Emley Moor transmitting station 281.8 km
Bingley 285.1 km
High Wycombe 285.8 km
Thorney Island 290.6 km
Farnborough 293.7 km
Isle of Man Airport 296.6 km
Leeds Bradford Airport 304.6 km
Cranfield Airport 308.4 km
Jersey Airport 308.5 km
Woburn 309.6 km
St Bees Head 310.6 km
Cherbourg - Maupertus Airport 313.4 km
Shap 316.8 km
Keswick 321.0 km
Ploumanac'h 322.4 km
Bedford 325.4 km
Heathrow Airport 325.8 km
Doncaster Airport 326.6 km
Northolt 327.9 km
Lannion Airport 331.7 km
Warcop Range 332.3 km
Luton Airport 334.1 km
Rothamsted Park 335.0 km
Wittering 337.9 km
Barkston 340.6 km
Great Dun Fell 343.5 km
Dundrennan 348.4 km
Linton-On-Ouse 348.7 km
Cranwell 349.9 km
Leeming 350.9 km
Morlaix/Ploujean 351.7 km
Topcliffe 352.1 km