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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.


Estações Meteorológicas Próximas - Harpenden Distância
Rothamsted Park 1.5 km
Aeroporto de Londres Luton 6.8 km
Northolt 32.5 km
Woburn 35.6 km
Aeroporto de Londres-Heathrow 39.2 km
Cranfield Airport 41.1 km
St. James's Park 42.4 km
Bedford 46.9 km
High Wycombe 52.2 km
Londres 56.8 km
Kenley 63.9 km
Aeroporto de Londres Stansted 65.4 km
Biggin Hill 68.8 km
Cambridge 73.1 km
Farnborough 75.3 km
Charlwood 76.0 km
Aeroporto de Londres Gatwick 76.5 km
Benson 86.2 km
Wittering 89.3 km
Andrewsfield Aerodrome 89.6 km
RAF Odiham 92.3 km
Oxford Airport 108.0 km
Brighton City Airport 109.7 km
Mildenhall Royal Air Force 111.1 km
London Southend Airport 119.6 km
Lakenheath 122.0 km
Church Lawford 124.8 km
Herstmonceux 127.0 km
Thorney Island 128.5 km
Holbeach Air Weapons Range 129.6 km
Barkston 130.3 km
Shoeburyness 134.2 km
Cranwell 136.3 km
RAF Brize Norton 136.9 km
Marham 137.9 km
Coningsby 142.5 km
Wattisham Airport 149.5 km
RAF Little Rissington 149.6 km
Waddington 151.4 km
Middle Wallop 154.4 km
Southampton Aeroporto 155.2 km
Midlands Orientais Aeroporto 156.9 km
Wainfleet All Saints 157.5 km
Fairford Aeroporto 161.0 km
Coleshill 165.9 km
Nottingham/Watnall 166.1 km
Scampton 166.6 km
Birmingham Aeroporto 169.4 km
MoD Boscombe Down 171.8 km
Lydd Airport 172.5 km
St. Catherine's Point 173.3 km
Larkhill 175.4 km
RAF Lyneham 186.1 km
Pershore 191.0 km
Donna Nook 192.9 km
Manston 196.2 km
Humberside 196.7 km
Doncaster Aeroporto 198.4 km
Bournemouth 201.2 km
Gloucester Aeroporto 201.8 km
Langdon Bay 204.0 km
Coal Aston Airfield 204.7 km
Norwich Weather Centre 205.4 km
Weybourne 206.8 km
Leconfield 229.3 km
Thorncliffe 233.0 km
Cosford 233.6 km
Cosford 236.2 km
Cosford 236.2 km
Emley Moor 247.8 km
Bolonha do Mar 248.3 km
Bridlington 255.0 km
Le Havre/Octeville 258.7 km
Sainte-Adresse 262.0 km
Le Touquet-Paris-Plage 262.4 km
Dieppe 264.6 km
Linton-On-Ouse 267.6 km
Aeroporto de Bristol 268.1 km
Yeovil 269.9 km
Aeroporto Internacional de Leeds Bradford 270.2 km
Cherbourg - Maupertus Airport 271.5 km
Credenhill 274.3 km
Manchester 274.7 km
Isle of Portland 274.9 km
Deauville-Saint-Gatien 278.7 km
Bingley 278.9 km
Deauville-Saint-Gatien AP 279.0 km
Shawbury 280.1 km
Rostherne 284.0 km
Fylingdales 286.0 km
Shobdon 286.1 km
Topcliffe 289.1 km
Cabo de la Hague 292.7 km
Caen 293.3 km
Leeming 306.2 km
Abbeville 306.9 km
Dunquerque 310.7 km
Loftus Samos 311.0 km
Alderney Channel Is 311.5 km
Rouen/Boos 320.2 km