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The WVF EFI complements the precipitation EFI by highlighting the large-scale water vapour transport in the atmosphere. In so doing, it can provide earlier awareness of extreme precipitation in upslope/mountainous regionregions, such as the west coasts of mid-latitude continents compared to that available from the EFI for precipitation, and . It can be especially helpful where complex topographic details are not well captured at ENS resolution, which in cases of non-negligible flow can result in underestimation of precipitation values on the upslope side (and overestimation on the downslope side). The WVF EFI can also deliver additional understanding of the synoptic-scale processes behind an extreme hydro-meteorological event may be obtained. Further details on the parameter can be found in these three publications (Lavers et al., 2016; 2017; 2018). WVF EFI/SOT are available for the same forecast steps as total precipitation EFI/SOT: 24-hourly intervals up to day 7, 72 and 120-hourly intervals up to day 10, and T+240-360h, T+0-240h and t+0-360h as well.
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