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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 - Derry Distance
Magilligan 25.5 km
Malin Head 40.5 km
Lough Fea 52.1 km
Castlederg 61.8 km
Portglenone 79.7 km
Thomastown 93.7 km
Ballypatrick Fst 110.5 km
Belfast Intl. Airport 111.4 km
Ballyhaise 111.7 km
Glenanne 115.7 km
Islay/Port Ellen 122.2 km
Donegal Airport 132.6 km
Finner Camp 136.3 km
Belfast/Harbour 149.5 km
Tiree Island 162.9 km
Machrihanish 166.9 km
Mullingar 168.7 km
Sligo Airport 182.3 km
Dublin Airport 204.9 km
Dublin Csmt Aero 209.2 km
Ireland West Airport 224.7 km
Gurteen 243.5 km
Oak Park 244.7 km
RAF West Freugh 247.4 km
Oban Airport 249.9 km
Claremorris 251.5 km
South Uist Range 253.3 km
Benbecula 269.5 km
Prestwick 290.4 km
Isle of Man Airport 299.9 km
Glasgow Bishopton 306.4 km
Bealach na Bà 308.3 km
Aonach Mòr 312.0 km
Johnstown Castle 313.2 km
Glasgow Airport 315.8 km
Waterford Airport 316.3 km
Shannon Airport 325.6 km
Belmullet 329.7 km
Tulloch Bridge 338.9 km
Glen Ogle 349.8 km
Dundrennan 350.8 km
Valley 353.0 km
Aultbea 354.4 km
Mace Head 360.7 km
Stornoway 362.2 km
Raf Mona 366.9 km
Aberdaron 367.9 km
Roches Point 378.9 km
Cork Airport 382.9 km
Drumalbin 385.5 km
Loch Glascarnoch 388.3 km
St Bees Head 397.9 km
Strathallan 405.4 km
Capel Curig 418.2 km
Aberporth 432.4 km
Edinburgh Airport 434.6 km
Edinburgh Gogarbank 434.7 km
Milford Haven 438.3 km
Aviemore 439.4 km
Eskdalemuir 439.9 km
Inverness Airport 442.2 km
Walney 446.3 km
Keswick 447.2 km
Rhyl 451.3 km
Cairngorms 453.5 km
Bala 462.6 km
Trawscoed 465.7 km
Sherkin 468.5 km
Altnaharra 468.7 km
Tain Air Weapons Range 470.1 km
Blackpool Airport 478.9 km
Pembrey Burrows 481.9 km
Lake Vyrnwy 482.8 km
Dundee/Riverside 485.6 km
Crosby 485.9 km
Valentia 486.5 km
Kinloss 492.1 km
Sennybridge 513.8 km
Lossiemouth 519.1 km
Mumbles 522.7 km
Sule Skerry 541.1 km
RM Chivenor 551.9 km
St Athan 578.1 km
Cardiff Airport 586.1 km
Wick 588.9 km
Liscombe 591.1 km