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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 - Writtle Distance
Andrewsfield Aerodrome 20.3 km
London Stansted Airport 27.6 km
London Southend Airport 35.0 km
London City Airport 47.4 km
Shoeburyness 49.1 km
Cambridge 59.7 km
Biggin Hill 60.6 km
St James's Park 65.4 km
Mildenhall Royal Air Force 72.2 km
Kenley 72.9 km
Wattisham Airport 75.3 km
Lakenheath 79.7 km
Rothamsted Park 86.8 km
Luton Airport 89.1 km
Gatwick Airport 91.9 km
Herstmonceux 92.6 km
Northolt 96.1 km
Charlwood 96.1 km
Heathrow Airport 100.1 km
Lydd Airport 102.7 km
Marham 105.2 km
Manston 111.6 km
Bedford 114.6 km
Woburn 118.0 km
Cranfield Airport 121.6 km
Langdon Bay 122.5 km
Brighton City Airport 125.5 km
Holbeach Air Weapons Range 132.4 km
High Wycombe 135.5 km
Wittering 139.5 km
Farnborough 140.3 km
Norwich Weather Centre 143.9 km
Wainfleet All Saints 153.6 km
Weybourne 158.1 km
RAF Odiham 160.6 km
Coningsby 165.4 km
Benson 169.0 km
Boulogne-sur-Mer 171.3 km
Barkston 177.0 km
Cranwell 178.6 km
Thorney Island 179.7 km
Le Touquet 188.9 km
Waddington 192.0 km
Oxford Airport 193.8 km
Donna Nook 197.9 km
Scampton 206.5 km
Church Lawford 207.3 km
Dieppe 212.6 km
Southampton Airport 221.7 km
RAF Brize Norton 222.1 km
Humberside 224.6 km
Dunkirk 225.9 km
St. Catherine's Point 229.0 km
Middle Wallop 229.6 km
East Midlands Airport 230.5 km
Nottingham/Watnall 234.7 km
RAF Little Rissington 235.4 km
Abbeville 236.5 km
Fairford Airport 245.7 km
Le Havre/Octeville 245.9 km
MoD Boscombe Down 248.8 km
Coleshill 248.9 km
Sainte-Adresse 249.8 km
Doncaster Airport 251.6 km
Birmingham Airport 252.9 km
Larkhill 253.4 km
Koksijde 258.5 km
Leconfield 258.5 km
Deauville-Saint-Gatien 263.1 km
Deauville-Saint-Gatien AP 263.3 km
RAF Lyneham 269.2 km
Coal Aston Airfield 271.1 km
Bournemouth 271.2 km
Bridlington 273.1 km
Rouen/Boos 273.4 km
Pershore 277.0 km
Ostend Airport 278.7 km
Gloucestershire Airport 287.6 km
Caen 298.1 km
Thorncliffe 309.7 km
Cherbourg - Maupertus Airport 311.5 km
Zeebrugge 312.7 km
Evreux/Fauville 313.4 km
Emley Moor transmitting station 313.5 km
Beauvais/Tille 313.9 km
Beitem 314.4 km
Cosford 317.4 km
Fylingdales 318.7 km
Linton-On-Ouse 318.8 km
Albert Airport 319.7 km
Euro Platform 319.7 km
Cosford 320.0 km
Cosford 320.0 km
Méaulte 320.2 km
Lille Airport 324.6 km
Leeds Bradford Airport 332.0 km
P11-b Sea 332.4 km
Topcliffe 341.4 km
Cap de la Hague 343.5 km
Cormeilles 343.9 km