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For the UKMET model, see: Tropical cyclone forecast model.

The Met Office (originally an abbreviation for Meteorological Office, but now the official name in itself), is the United Kingdommarker's national weather service, and a trading fund of the Ministry of Defence. Part of the Met Office headquarters at Exetermarker in Devonmarker is the Met Office College, which handles the training for internal personnel and many forecasters from around the world. The current chief executive is John Hirst.


Established in 1854 as a small department within the Board of Trade under Robert FitzRoy as a service to mariners. The loss of the passenger vessel the Royal Charter and 459 lives off the coast of Angleseymarker in a violent storm in October 1859 led to the first gale warning service. In 1861 FitzRoy had established a network of 15 coastal stations from which visual gale warnings could be provided for ships at sea.

The development of the electric telegraph in the 1870s led to the more rapid dissemination of warnings and also led to the development of an observational network which could then be used to provide synoptic analyses.

In 1879 the Met Office started providing forecast to newspapers.

Connection with the Ministry of Defence

Following the First World War, the Met Office became part of the Air Ministry in 1920, the weather observed from the top of Adastral House (where the Air Ministry were based) giving rise to the phrase "The weather on the Air Ministry roof". As a result of the need for accurate weather information for aviation, the Met Office located many of its observation and data collection points on RAF airfields, and this accounts for the large number of military airfields mentioned in weather reports even today. In 1936 the Met Office split with services to the Royal Navy being provided by their own forecasting services.

It currently holds a quasi-governmental role, being required to act commercially, but also has remained an executive agency of the Ministry of Defence since April 1990. A branch of the Met Office known as the Mobile Met Unit (MMU) accompany forward units in times of conflict advising the armed forces of the prevailing conditions for battle, particularly the RAF. The Hadley Centre for Climate Prediction and Research is also part of the Met Office.


Met Office HQ, Exeter.

In September 2003 the Met Office moved its headquarters to a purpose-built £80m structure near Exeter Airportmarker and the A30, in Devonmarker, being officially opened on 21 June 2004 - its 150th anniversary - by Robert May, Baron May of Oxford, from its previous location of Bracknellmarker in Berkshire, and it has a worldwide presence including a forecasting centre in Aberdeenmarker, and offices in Gibraltarmarker and on the Falklandsmarker. Other outposts lodge in establishments such as the Joint Centre for Mesoscale Meteorology (JCMM) at University of Reading in Berkshire, the Joint Centre for Hydro-Meteorological Research (JCHMR) site at Wallingfordmarker in Oxfordshire, and there is also a Met Office presence at many Army and Air Force bases within the UK and abroad. Royal Navy weather forecasts are generally provided by naval officers, not Met Office personnel.

The new building on the edge of Exeter


The Shipping Forecast

One of the British stalwarts the Shipping Forecast is produced by the Met Office and broadcast on BBC Radio 4. The Shipping Forecast has long been of real interest to, and vital to the safety of, mariners traversing the Sea Areas around the British Islesmarker, and its broadcast on radio is still avidly listened to. Less vitally, the Shipping Forecast has been the subject of both books and song lyrics.

Weather Forecasting and Warnings

The Met Office is responsible for issuing Severe Weather Warnings for the United Kingdommarker through the National Severe Weather Warning Service (NSWWS). These warn of weather events that may affect transport infrastructure and endanger people's lives. In March 2008, the system was improved and a new stage of warning was introduced, the 'Advisory'.

Weather prediction models

Its main role is to produce forecast models by gathering all the information from weather satellites in space and observations on earth, then processing it using supercomputers which produce a variety of models, collectively known as the Unified Model. If necessary, forecasters may then make adjustments to the forecasts. This main bulk of data is then passed on to companies who acquire it. Data is stored in the Met Office's own PP-format.

Supply of forecasts for broadcasting companies

In particular, two of the main media companies, the BBC and ITV produce forecasts using the Met Office's data. At the BBC Weather Centre, they are continuously updated on the latest information arriving by computer, or by fax and e-mail. The BBC's new graphics are used on all of their television weather broadcasts, but ITV Weather use animated weather symbols. This is mainly how the public are informed of weather events which may affect day-to-day life. The forecasters at the BBC Weather centre are employed by the Met Office, not the BBC.

World Area Forecast Centre

The Met Office is also one of only two World Area Forecast Centres or WAFCs, and is referred to as WAFC London. The other WAFC is located in Kansasmarker, USA but known as WAFC Washington. WAFC data is used daily to safely and economically route aircraft, particularly on long-haul journeys. The data provides details of wind speed and direction, air temperature, cloud type and tops, and other features of interest to the aviation community.

Volcanic Ash Advisory Centre

As part of its aviation forecast operation the Met Office operates the London VAAC. This provides forecasts to the aviation industry of volcanic ash clouds that could enter aircraft flight paths and impact aviation safety. The London VAAC, one of nine worldwide, is responsible for the area covering the United Kingdom, Ireland, the north east Atlantic and Iceland. The VAAC were set up by the International Civil Aviation Organisationmarker (ICAO), an agency of the United Nations, as part of the International Airways Volcano Watch (IAVW). The London VAAC makes use of satellite images, plus seismic, radar and visual observation data from Iceland, the location of all of the active volcanoes in its area of responsibility. The NAME developed by the Met Office is used to forecast the movement of the ash clouds 6, 12 and 18 hours from the time of the alert at different flight levels.

Air Quality

The Met Office issues air quality forecasts made using NAME, the Met Office's medium-to-long-range atmospheric dispersion model. It was originally developed as a nuclear accident model following the Chernobyl accidentmarker in 1986, but has since evolved into an all-purpose dispersion model capable of predicting the transport, transformation and deposition of a wide class of airborne materials. NAME is used operationally by the Met Office as an emergency response model as well as for routine air quality forecasting. Aerosol dispersion is calculated using the UKCA model.

The forecast is produced for a number of different pollutants and their typical health effects are shown in the following table.

Pollutant Health Effects at High Level
Nitrogen dioxide
Sulphur dioxide

These gases irritate the airways of the lungs, increasing the symptoms
of those suffering from lung diseases.

Fine particles can be carried deep into the lungs where they can cause
inflammation and a worsening of heart and lung diseases

High Performance Computing

Due to the large amount of computation needed for Numerical Weather Prediction and the Unified model, the Met Office has had some of the most powerful supercomputers in the world. In November 1997 the Met Office supercomputer was ranked third in the world..
Year Computer Calculations a second Horizontal Resolution (Global/local) Number of Vertical levels
1959 Ferranti Mercury 3Kflops (N.A./320 km) 2 levels
1965 English Electric KDF9 50Kflops (N.A./300 km) 3 levels
1972 IBM System/360 195 4Mflops (300 km/100 km) 10 levels
1982 CDC Cyber 205 200Mflops (150 km/75 km) 15 levels
1991 Cray Y-MP C90/16 10Gflops (90 km/17 km) 19 levels
1997 Cray T3E 900/1200 430Gflops (60 km/12km) 38 levels
2004 NEC SX-6 2.0Tflops (40km/12km) 50 levels
2006 NEC SX-8 and SX-6 5.4Tflops (40km/4km) 50 levels
2009 IBM Power6 140Tflops (40km/1.5km) 25km/1.5km by 2010 70 levels

Weather stations

Reports (observations) from weather stations vary considerably. They can be automatic (totally machine produced), semi-automatic (part-machine and part manual), or manual. Some stations produce manual observations during business hours and revert to automatic observations outside these times. Many stations now also feature recent innovations such as "present weather" sensors, CCTV, etc.

Some stations have limited reporting times, while other report continuously, mainly RAF and Army Air Corps stations where a manned met office is provided for military operations. The "standard" is a once-hourly reporting schedule, but automatic stations can often be "polled" as required, while stations at airfields regularly report twice-hourly, with additional (often frequent in times of bad weather) special reports as necessary to inform airfield authorities of changes to the weather that may affect aviation operations.

Some stations report only CLIMAT data (e.g maximum and minimum temperatures, rainfall totals over a period, etc.) and these are usually recorded at 0900 and 2100 hours daily. Weather reports are often performed by observers not specifically employed by the Met Office, e.g. Air traffic control staff, coastguards, university staff, etc.

Notable former Directors General and Chief Executives

See also


  1. Met Office warning colours
  2. BBC Weather - Producing Weather Broadcasts
  3. How the weather is forecast: The Met Office
  4. London VAAC
  5. International Airways Volcano Watch
  6. Overview of VAAC Activities presentation
  7. United Kingdom Meteorological Office | TOP500 Supercomputing Sites
  8. Prestatyn Weather website

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