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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 - Hemel Hempstead Distance
Northolt 5.1 km
London Heathrow Airport 11.2 km
St. James's Park 25.4 km
High Wycombe 26.5 km
Rothamsted Park 27.2 km
Wisley 27.8 km
Luton Airport 34.1 km
London City Airport 36.6 km
Farnborough 37.8 km
Kenley 39.9 km
Benson 43.1 km
Biggin Hill 43.6 km
RAF Odiham 49.3 km
Gatwick Airport 50.4 km
Woburn 50.9 km
Charlwood 51.3 km
Gravesend Broadness 54.8 km
Cranfield Airport 56.6 km
London Stansted Airport 59.8 km
Writtle 63.4 km
London Oxford Airport 65.8 km
East Malling and Larkfield 72.0 km
Bedford 72.3 km
Andrewsfield Aerodrome 72.5 km
RAF Brize Norton 78.8 km
London Southend Airport 80.9 km
Shoreham Airport 82.6 km
Moulton Park 82.6 km
Cambridge 83.5 km
Girton 83.8 km
Shoeburyness 89.0 km
Middle Wallop 89.6 km
RAF Little Rissington 89.8 km
Thorney Island 90.9 km
Fairford Airport 91.9 km
Herstmonceux 93.0 km
Monks Wood 94.3 km
Southampton Airport 98.7 km
MoD Boscombe Down 99.8 km
Larkhill 101.4 km
Barrow 104.1 km
Church Lawford 104.9 km
MoD Lyneham 105.5 km
Mildenhall Royal Air Force 110.4 km
Coventry Airport 113.2 km
Wittering 115.0 km
Wattisham 115.2 km
Lakenheath 118.2 km
Lydd Airport 119.4 km
Gloucestershire Airport 121.5 km
St. Catherine's Point 124.0 km
Santon Downham 125.4 km
Pershore 125.9 km
Bournemouth 129.3 km
Birmingham Airport 131.2 km
Coleshill 131.8 km
Marham 139.8 km
Winterbourne Botanic Garden 139.9 km
Sutton Bonington 149.0 km
Swanage 149.6 km
RAF Holbeach 150.4 km
East Midlands Airport 152.9 km
Barkston 155.9 km
Cranwell 161.4 km
Nottingham/Watnall 168.2 km
Coningsby 170.0 km
Wainfleet 176.0 km
Waddington 178.1 km
Scampton 193.0 km