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United Kingdom

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 15.2 km
Rothamsted Park 20.7 km
Cranfield Airport 29.6 km
London Stansted Airport 32.3 km
Bedford 33.3 km
Cambridge 37.7 km
RAF Wyton 43.2 km
Andrewsfield Aerodrome 46.7 km
Northolt 50.2 km
High Wycombe 51.0 km
St. James's Park 52.4 km
London City Airport 55.1 km
London Heathrow Airport 57.9 km
Mildenhall Royal Air Force 65.3 km
Gravesend Broadness 66.1 km
Benson 71.3 km
Lakenheath 73.3 km
Biggin Hill 74.1 km
Wittering 74.3 km
Kenley 74.8 km
London Southend Airport 77.3 km
Wattisham 81.6 km
Shoeburyness 85.0 km
Farnborough 85.0 km
Church Lawford 88.3 km
Gatwick Airport 90.9 km
Charlwood 92.8 km
Marham 92.9 km
RAF Odiham 95.5 km
RAF Brize Norton 97.0 km
Coventry Airport 97.3 km
RAF Little Rissington 101.3 km
RAF Holbeach 103.0 km
Fairford Airport 112.9 km
Barkston 113.8 km
Coleshill 115.4 km
Birmingham Airport 116.6 km
Cranwell 120.3 km
East Midlands Airport 122.7 km
Coningsby 124.3 km
Herstmonceux 125.8 km
Shoreham Airport 126.3 km
Norwich Weather Centre 127.1 km
Manston 128.1 km
Wainfleet 128.5 km
Middle Wallop 130.4 km
Nottingham/Watnall 134.7 km
Waddington 135.1 km
Lydd Airport 138.5 km
MoD Boscombe Down 138.5 km
Thorney Island 138.7 km
Larkhill 138.8 km
Weybourne 140.6 km
Langdon Bay 142.7 km
Southampton Airport 144.4 km
Solent MRSC 147.3 km
Scampton 150.1 km
Donna Nook 169.1 km
St. Catherine's Point 171.5 km
Doncaster Airport 175.1 km
Humberside 180.2 km