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In this exercise we will use Metview to explore the various ways ensemble forecast forecasts can be processed and visualised. The case we will investigate is related to a low pressure system crossing the UK on 10 August 2014: it caused high winds and heavy rain especially in the South-Western part of the country.
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Drag your Macro into the bottom left map and customise it with the wgust_shade Contouring icon. You would also need a custom Text Plotting icon for the title. Take a copy of the one used for the previous plots (called title_oper) and tailor it to your needs. When you analyse the plot you will notice that the ensemble mean hints for higher wind gusts in our area of interest.
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Create a new Macro and edit it. Drop your Geographical View and the Coastlines icons into the Macro editor. Once you've tidied up the code, define a 6x9 layout so that each plot should contain your view:
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We finish the case study by looking into the predictability of the large scale flow pattern by generating spaghetti plots from the same ENS run as we investigated before. In a spaghetti plot each ENS member is rendered into the same map using a single isoline value. The plot we want to generate is shown below (it contains the spaghetti plot for 500 hPa geopotential using the 560 gpm isoline value):
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We finish the loop by plotting the field with our contour settings and title (inside the loop) :
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plot(your_view,f,cont,title) |
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