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of the event. Figure 1: A probability chart produced 18 hours ahead, showing a high probability of the six-hour rainfall exceeding 20 mm in northern England Case study 2 Another example of a high-impact forecast, where forecasters were helped by the use of ensembles, was for new year celebrations

it caused further weather impacts to southern Norway and Sweden, and northern Denmark. Weather data The analysis chart at 0600UTC 17 February 2023 shows the centre of storm Otto over the Northern Isles driving very strong north-westerly winds across Scotland and north-east England. The rain-radar image

website for use by other national meteorological services. These are global charts of temperature, precipitation and pressure anomalies and, as it states on the webpage, do not “constitute a seasonal forecast for a specific location”. The requirements are set by WMO Members. It is not designed for use

about our WAFC London performance indicators  What Does a WAFC Provide?  SIGWX Forecasts: SIGWX charts are essential for pilots, providing a broad overview of significant weather relevant to their flight. Elements visible in these charts include jet streams (wind speeds exceeding 80 knots), areas

will retire the existing medium-level SIGWX charts (4 areas), which only cover part of the globe, in late 2024. Format The WAFCs currently provide WAFS SIGWX forecasts for the graphical elements as objects in BUFR code and PNG formats. Next generation WAFS SIGWX will provide these objects in IWXXM format

Case 2 Route: Cambridge to Gloucester (VFR) Date: 11 th March 2017, departing 08 UTC Let’s take a look at the weather forecast, assess the potential threats and start investigating how to mitigate against these risks. a. Synoptic situation Describe the broad features in the synoptic chart, what

September 1980. The chart below shows minute-by-minute rainfall rate in millimetres per hour and indicates a peak of 180 mm/h. These data were recorded using a tipping-bucket raingauge (TBR). Top five wettest days in BracknellTop five wettest Mays in Bracknell 1 20 Sep 1980 70.8 mm 1 2000 149.8 mm 2

beginnings of today’s Met Office forecasting service. The above image shows the original weather chart produced by Met Office founder Robert FitzRoy to depict the Royal Charter Gale in October 1859. The world’s first national forecast warning service Widespread national press coverage after the tragedy

) Arctic sea ice extent derived from satellite sea ice concentration measurements taken over the period 1981-2010. Sea ice concentration may also be provided through ice charts. Ice charts are interpretations of data from a number of sources, such as on-shore observations, satellite imagery and sometimes

chart at 00 UTC Friday 12 October 2018 showing storm Callum centred to the west of Ireland with associated fronts approaching the south-west. Analysis chart at 00 UTC 13 October 2018 showing associated fronts from storm Callum across England and Wales, bringing persistent heavy rainfall. Satellite image