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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 - Hemel Hempstead Distance
Northolt 6.0 km
Heathrow Airport 10.5 km
Rothamsted Park 29.2 km
Luton Airport 35.7 km
St James's Park 38.7 km
High Wycombe 39.3 km
Farnborough 45.9 km
Kenley 51.4 km
Woburn 52.2 km
Charlwood 54.6 km
Gatwick Airport 56.1 km
London City Airport 58.0 km
Cranfield Airport 58.5 km
Biggin Hill 61.1 km
RAF Odiham 64.3 km
Benson 69.9 km
Bedford 72.4 km
Shoreham Airport 84.1 km
London Stansted Airport 85.5 km
Gravesend Broadness 86.9 km
Thorney Island 98.3 km
London Oxford Airport 99.5 km
Cambridge 101.0 km
Andrewsfield Aerodrome 108.3 km
Herstmonceux 114.8 km
Wittering 115.8 km
RAF Brize Norton 125.0 km
Southampton Airport 127.7 km
London Southend Airport 128.8 km
Church Lawford 129.8 km
Middle Wallop 130.9 km
Mildenhall Royal Air Force 137.7 km
RAF Little Rissington 139.8 km
St. Catherine's Point 143.5 km
Shoeburyness 143.6 km
Fairford Airport 147.5 km
Lakenheath 148.9 km
MoD Boscombe Down 149.6 km
Larkhill 153.9 km
Barkston 156.2 km
RAF Holbeach 159.9 km
Cranwell 162.4 km
Marham 166.7 km
East Midlands Airport 169.5 km
Coleshill 169.6 km
MoD Lyneham 169.6 km
Wattisham Airport 169.8 km
Lydd Airport 170.5 km
Birmingham Airport 171.9 km
Coningsby 172.1 km
Bournemouth 175.3 km
Waddington 178.2 km
Nottingham/Watnall 182.2 km
Pershore 186.1 km
Wainfleet 188.0 km
Gloucestershire Airport 191.5 km
Scampton 193.2 km
Manston 203.7 km
Langdon Bay 207.9 km
Doncaster Airport 220.3 km
Donna Nook 220.4 km
Coal Aston Airfield 220.7 km
Humberside 224.9 km
Norwich Weather Centre 229.7 km
Weybourne 233.8 km
Le Havre/Octeville 234.5 km
Cosford 234.5 km
Filton 235.7 km
Sainte-Adresse 237.6 km
Cherbourg - Maupertus Airport 240.7 km
Thorncliffe 241.3 km
Boulogne-sur-Mer 248.1 km
Yeovil 249.3 km
Isle of Portland 249.8 km
Bristol / Lulsgate 251.3 km
Dieppe 251.9 km
Deauville-Saint-Gatien 254.8 km
Deauville-Saint-Gatien AP 255.7 km
Leconfield 256.6 km
Le Touquet 259.7 km
Cap de la Hague 262.8 km
Emley Moor transmitting station 263.5 km
Caen 265.3 km
Credenhill 266.0 km
Shobdon 278.8 km
Shawbury 280.7 km
Alderney Channel Is 282.2 km
Manchester 283.3 km
Bridlington 284.0 km
Leeds Bradford Intl. Airport 287.9 km
Linton-On-Ouse 288.9 km
Rostherne 291.2 km
Bingley 294.0 km
Abbeville 301.7 km
Rouen/Boos 304.6 km
Topcliffe 310.4 km
Fylingdales 312.5 km
Dunkirk 317.0 km
Dunkeswell Airport 318.4 km
Cardiff Airport 320.3 km