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• The London VAAC process

  The London VAAC has specialist forecasters who produce volcanic ash advisories and guidance products using a combination of data from observations and models.

  Introduction The Met Office NAME dispersion model is initialised with both meteorological and volcanic eruption data. This includes winds, temperature, humidity, height of plume, size of ash particles and more. NAME is the standard dispersion model used by London VAAC, but data from other

• VAAC London QVA API

  The VAAC London QVA API, introduced in July 2025, provides access to the Quantitative Volcanic Ash (QVA) data sets provided by the London Volcanic Ash advisory centre (VAAC).

    To access the VAAC London QVA API, users must: Review the service summary. Find full details in the QVA API Licence Agreement and QVA API Standard terms and conditions. Register your acceptance of the QVA User Licence Agreement. Email QVA@metoffice.gov.uk to start the registration process

• WAFC London Performance Indicators

  These plots show the performance of WAFC London forecasts produced by the Met Office in the United Kingdom.

  Verification statistics for World Area Forecast Centre (WAFC) London data sets are produced by the Met Office for various regions, mostly corresponding to World Meteorological Organization (WMO) CBS-defined areas for comparison between modelling centres. Area 2 covers the north Atlantic, western

• London Marathon weather forecast

  High pressure will influence the UK’s weather this weekend, but what does that mean for the thousands of people running the TCS London Marathon?

  After a wet start to April, where some counties have already had more than their average rainfall for the whole of the month, the weekend weather forecast is for drier, more settled weather to become dominant for much of the UK. Speaking in the Met Office’s London Marathon forecast on YouTube, Met

• VAAC London QVA Licence Agreement

  VAAC LONDON QVA API LICENCE AGREEMENT (Standard VAAC London QVA API Licence for use with VAAC London QVA Terms) This Licence Agreement for use with VAAC London QVA Terms (as defined below) incorporates the following: (A) (B) (C) (D) VAAC London QVA Terms; Privacy Policy: http://www.metoffice.gov.uk

• VAAC London QVA API Service Summary

  This is a human-readable summary of (and not a substitute for reading) VAAC London QVA API Licence Agreement and VAAC London QVA Standard Terms. Such summary is merely provided to aid understanding of certain key points. You should carefully read all terms and conditions of VAAC London QVA API

• VAAC London QVA Standard Terms and Conditions

  THE MET OFFICE STANDARD TERMS & CONDITIONS FOR THE SUPPLY OF SERVICES IN RELATION TO VAAC LONDON QUANTITATIVE VOLCANIC ASH The Customer’s attention is drawn in particular to the provisions of clauses 5 and 10. AGREED TERMS:- 1. Interpretation 1.1 The definitions and rules of interpretation

• Volcanic Ash

  London VAAC: Volcanic ash advisories and graphics

  viewing experience of this website, please enable JavaScript. Volcanic Ash London VAAC: Volcanic ash advisories and graphics Volcanic Ash Advisories (VAA) and Graphics (VAG) links are provided for each message issued. Volcanic Ash BACK-UP EXERCISE Thursday 2nd July 2026 Please be aware that London VAAC

• VAAC London QVA API Licence Agreement

  Standard VAAC London QVA API Licence for use with VAAC London QVA Terms

  This Licence Agreement for use with VAAC London QVA Terms (as defined below) incorporates the following: VAAC London QVA Terms; Privacy Policy:  http://www.metoffice.gov.uk/about-us/legal/privacy; The API Documentation (as defined below); The relevant terms governing an account held with Amazon Web

• vaac-london-qva-user-guide-v13pdf

  VAAC LONDON QUANTITATIVE VOLCANIC ASH (QVA) API USER GUIDE First Edition — July 2025 INTERNATIONAL CIVIL AVIATION ORGANIZATION The designations and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of ICAO concerning the legal status