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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 - Letchworth Distance
Luton Airport 19.9 km
Rothamsted Park 23.8 km
Bedford 40.7 km
Woburn 43.0 km
Cranfield Airport 46.0 km
London Stansted Airport 50.9 km
Cambridge 51.6 km
St James's Park 52.6 km
Northolt 53.3 km
London City Airport 59.8 km
Heathrow Airport 60.7 km
High Wycombe 72.2 km
Andrewsfield Aerodrome 74.7 km
Kenley 75.3 km
Wittering 76.1 km
Biggin Hill 76.4 km
Gravesend Broadness 81.2 km
Mildenhall Royal Air Force 89.4 km
Gatwick Airport 91.0 km
Charlwood 92.0 km
Farnborough 97.6 km
Lakenheath 100.6 km
Benson 104.9 km
RAF Holbeach 108.0 km
London Southend Airport 110.3 km
RAF Odiham 114.4 km
Marham 115.7 km
Barkston 117.9 km
Cranwell 122.1 km
London Oxford Airport 123.5 km
Coningsby 124.4 km
Shoeburyness 124.6 km
Shoreham Airport 126.4 km
Church Lawford 130.8 km
Wattisham 131.5 km
Herstmonceux 133.6 km
Wainfleet 135.9 km
Waddington 137.7 km
Thorney Island 150.8 km
RAF Brize Norton 152.9 km
Scampton 153.0 km
East Midlands Airport 155.9 km
Nottingham/Watnall 163.0 km
RAF Little Rissington 164.4 km
Donna Nook 170.6 km
Lydd Airport 170.9 km
Coleshill 173.1 km
Middle Wallop 175.6 km
Birmingham Airport 177.2 km
Southampton Airport 177.3 km
Fairford Airport 177.8 km
Humberside 180.6 km
Weybourne 184.3 km
Norwich Weather Centre 184.4 km
Manston 187.4 km
Doncaster Airport 189.0 km
MoD Boscombe Down 192.5 km
St. Catherine's Point 195.6 km
Larkhill 195.8 km
Langdon Bay 197.5 km
Coal Aston Airfield 200.5 km
Pershore 203.3 km
MoD Lyneham 203.9 km
Leconfield 213.5 km
Gloucestershire Airport 216.1 km
Bournemouth 223.0 km
Thorncliffe 234.3 km
Bridlington 237.5 km
Cosford 241.7 km
Emley Moor transmitting station 243.7 km
Boulogne-sur-Mer 244.4 km
Linton-On-Ouse 257.9 km
Le Touquet 260.2 km
Leeds Bradford Intl. Airport 264.9 km
Filton 268.2 km
Dieppe 269.7 km
Fylingdales 271.8 km
Le Havre/Octeville 272.9 km
Bingley 275.1 km
Sainte-Adresse 276.4 km
Manchester 276.8 km
Topcliffe 280.5 km
Bristol / Lulsgate 285.8 km
Rostherne 285.8 km
Credenhill 287.9 km
Shawbury 288.1 km
Yeovil 289.7 km
Deauville-Saint-Gatien 292.6 km
Cherbourg - Maupertus Airport 293.1 km
Deauville-Saint-Gatien AP 293.4 km
Isle of Portland 296.4 km
Loftus Samos 297.1 km
Shobdon 297.8 km
Leeming 298.2 km
Dunkirk 301.6 km
Abbeville 306.1 km
Caen 310.9 km
Durham Tees Valley Airport 312.9 km
Cap de la Hague 315.0 km
Stonyhurst 325.4 km