GFM aims to guarantee a high degree of accuracy for all its products, yet users must be aware that a certain degree of uncertainty has to be taken into account.
Therefore, before taking a decision, it is highly recommended to crosscheck GFM's information with other, independent sources such as VIIRS, MODIS, UNITAR, International Disaster Charter, Dartmouth Flood Observatory
National hydro-meterological service are usually another valuable and authoritative way of checking current danger levels: please check WMO's full list to find the national body in charge in the territory in your AOI.