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and IWXXM form received from the WAFCs shall be decoded into standard WAFS charts in accordance with relevant provisions in this PANS and Annex 3, and the meteorological content and identification of the originator of the forecasts provided by the WAFCs shall not be amended. 1.3.3. As described

of time, altitude and geographical extent, unless otherwise agreed between the meteorological authority and the operator concerned. 2.1.2 In order to ensure uniformity and standardization of flight documentation, the WAFS GRIB and BUFR data received shall be decoded into standard WAFS charts

2025: • Big changes to WAFS Significant Weather (SIGWX) forecasts • Existing T+24 forecasts/chart production will be automated and their appearance/content will change • New multi-timestep SIGWX forecasts covering T+6 to T+48 at 3-hourly intervals will be introduced (Feb 2025). www.metoffice.gov.uk

’ for the period and used in medium range chart production. Product Title Forecast data for the UK and surrounding area Purpose of the Product For use on: • Broadcast graphics Data Parameters Supplied The following parameters are used: Parameter Units GRIB Levels 00z, 12z Fog Fraction at 1.5m fraction 0

Advisories, Special AIREPs, ASHTAM and NOTAM. 3. display WAFC gridded data in GRIB2 format 4. display WAFC SIGWX data created from the BUFR data set 5. display the WAFC SIGWX png format charts 6. process and display administrative messages It is also advised that the system is able to: 7

, but by far the greatest impact was from the flooding. Weather data The analysis chart for 1200 GMT on 5 December shows a deep Atlantic low pressure system to the east of Iceland, with associated fronts stretching across northern Britain. The UK was located in a mild, moist southwesterly airstream

Forecast data is limited in its nature and extent as the purpose of the archive is to record observations rather than predictions. The main types of forecast information held are surface charts, marine forecasts and National Severe Weather Warnings.   1. Surface Charts A range of forecast surface

less than 20 mm during the three months of March to May. This was one of the sunniest Springs in the series from 1929, and it was particularly sunny across England and Wales where more than 125% was recorded widely. With high pressure and clear skies, April was a particularly sunny month with almost

surface chart of the British Isles shows a deep area of low pressure in the western English Channel with its associated occluded frontal system wrapped around it. Also depicted on this chart is a warm front across the western part of Scotland and into Northern Ireland and a trailing cold front lying