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The Extreme Forecast Index and Shift of Tails are presented in chart form, either for each parameter separately, or on a composite chart that caters for temperature, precipitation and maximum gusts.
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Impact of local time differences from UTC when using EFI and SOT
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charts
EFI and SOT charts and diagrams refer to 24hr periods (T+00 to T+24, T+24 to T+48, T+48 to T+60 etc, etc.) and the charts run from 00UTC to 24UTC each day. Thus, depending on the longitude, the period of the 24hr EFI and SOT will not match local time and charts of EFI probability may span over two days in local time. So as examples:
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