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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.


Estaciones meteorológicas cercanas - Hemel Hempstead Distancia
Northolt 5.5 km
Londres-Heathrow aeropuerto 9.9 km
Rothamsted Park 29.3 km
Londres-Luton aeropuerto 36.0 km
St. James's Park 38.0 km
High Wycombe 39.3 km
Farnborough 45.9 km
Kenley 51.0 km
Woburn 52.2 km
Charlwood 53.9 km
Londres-Gatwick aeropuerto 56.1 km
la Ciudad de Londres aeropuerto 58.0 km
Cranfield Aeropuerto 58.7 km
Biggin Hill 61.5 km
RAF Odiham 64.5 km
Benson 70.6 km
Bedford 72.4 km
Brighton City aeropuerto 84.1 km
Londres-Stansted aeropuerto 85.5 km
Thorney Island 97.9 km
Oxford aeropuerto 99.6 km
Cambridge 101.0 km
Andrewsfield Aerodrome 108.5 km
Herstmonceux 115.1 km
Wittering 116.3 km
RAF Brize Norton 125.6 km
Southampton Aeropuerto 127.7 km
Londres-Southend aeropuerto 129.4 km
Church Lawford 130.5 km
Middle Wallop 130.9 km
Mildenhall Royal Air Force 138.2 km
RAF Little Rissington 140.4 km
Punta de St. Catherine 143.5 km
Shoeburyness 144.0 km
Fairford Aeropuerto 147.9 km
Lakenheath 148.9 km
MoD Boscombe Down 149.6 km
Larkhill 153.9 km
Barkston 156.2 km
Holbeach Air Weapons Range 160.3 km
Cranwell 163.1 km
Marham 166.7 km
Coleshill 169.6 km
Lyneham Airfield 170.0 km
Wattisham aeropuerto 170.2 km
Región de las Tierras Medias Orientales Aeropuerto 170.3 km
Lydd aeropuerto 170.6 km
Birmingham Aeropuerto 171.9 km
Coningsby 172.1 km
Bournemouth 175.3 km
Waddington 178.2 km
Nottingham/Watnall 182.4 km
Pershore 186.1 km
Wainfleet All Saints 188.2 km
Gloucestershire Aeropuerto 192.0 km
Scampton 193.2 km
Manston 203.7 km
Langdon Bay 207.9 km
Doncaster Aeropuerto 220.7 km
Coal Aston Airfield 221.2 km
Donna Nook 223.3 km
Humberside 224.9 km
Norwich Weather Centre 230.6 km
Weybourne 234.5 km
Le Havre/Octeville 234.5 km
Cosford 234.5 km
Cosford 237.0 km
Cosford 237.0 km
Sainte-Adresse 237.6 km
Cherbourg - Maupertus aeropuerto 240.8 km
Thorncliffe 242.1 km
Boulogne-sur-Mer 248.1 km
Yeovil 249.3 km
Isla de Pórtland 249.8 km
Brístol aeropuerto 251.6 km
Dieppe 251.9 km
Deauville-Saint-Gatien 254.8 km
Deauville-Saint-Gatien aeropuerto 255.1 km
Leconfield 256.9 km
Le Touquet-Paris-Plage 259.7 km
Cabo de la Hague 262.8 km
Emley Moor transmitting station 263.9 km
Caen 265.3 km
Credenhill 266.0 km
Shobdon 279.5 km
Shawbury 280.7 km
Alderney Channel Is 282.2 km
Mánchester 283.3 km
Bridlington 284.0 km
Leeds Bradford aeropuerto 287.9 km
Linton-On-Ouse 289.4 km
Rostherne 292.0 km
Bingley 294.4 km
Abbeville 301.7 km
Rouen/Boos 304.6 km
Topcliffe 310.4 km
Fylingdales 312.5 km
Dunkerque 317.0 km
Dunkeswell Aeropuerto 318.6 km
Cardiff Aeropuerto 320.8 km