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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
Eglinton Airport 10.0 km
Magilligan 35.5 km
Malin Head 40.2 km
Castlederg 52.3 km
Lough Fea 56.9 km
Thomastown 85.8 km
Portglenone 87.9 km
Ballyhaise 107.0 km
Belfast Intl. Airport 118.8 km
Glenanne 119.0 km
Ballypatrick Fst 120.2 km
Donegal Airport 123.4 km
Finner Camp 126.3 km
Islay/Port Ellen 132.0 km
Belfast/Harbour 157.2 km
Mullingar 164.0 km
Tiree Island 168.4 km
Sligo Airport 172.4 km
Machrihanish 176.8 km
Dublin Airport 206.4 km
Dublin Csmt Aero 209.6 km
Ireland West Airport 215.0 km
Gurteen 236.6 km
Claremorris 241.8 km
Oak Park 242.2 km
South Uist Range 256.2 km
RAF West Freugh 256.4 km
Oban Airport 259.4 km
Benbecula 272.5 km
Prestwick 300.1 km
Isle of Man Airport 307.3 km
Johnstown Castle 311.9 km
Waterford Airport 312.9 km
Bealach na Bà 316.3 km
Glasgow Bishopton 316.4 km
Shannon Airport 317.1 km
Belmullet 319.8 km
Aonach Mòr 321.5 km
Glasgow Airport 325.8 km
Tulloch Bridge 348.5 km
Mace Head 350.9 km
Valley 358.6 km
Glen Ogle 359.8 km
Dundrennan 359.8 km
Aultbea 362.1 km
Stornoway 368.2 km
Aberdaron 372.3 km
Roches Point 372.4 km
Raf Mona 372.8 km
Cork Airport 375.9 km
Drumalbin 395.2 km
Loch Glascarnoch 397.2 km
St Bees Head 406.6 km
Strathallan 415.4 km
Capel Curig 424.3 km
Aberporth 435.9 km
Milford Haven 440.2 km
Edinburgh Airport 444.5 km
Edinburgh Gogarbank 444.6 km
Aviemore 449.2 km
Eskdalemuir 449.4 km
Inverness Airport 451.7 km
Walney 454.5 km
Keswick 456.0 km
Rhyl 458.1 km
Sherkin 460.4 km
Cairngorms 463.4 km
Bala 468.8 km
Trawscoed 470.5 km
Valentia 477.3 km
Altnaharra 477.5 km
Tain Air Weapons Range 479.5 km
Pembrey Burrows 485.2 km
Blackpool Airport 486.7 km
Lake Vyrnwy 488.8 km
Crosby 493.4 km
Dundee/Riverside 495.6 km
Kinloss 501.7 km
Sennybridge 518.6 km
Mumbles 526.2 km
Lossiemouth 528.8 km
Sule Skerry 549.4 km
RM Chivenor 554.6 km
St Athan 582.2 km
Cardiff Airport 590.3 km
Liscombe 594.6 km
Wick 598.3 km