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A new 3-D tracer tool is coupled to the WRF model to analyze the origin of\udthe moisture in two extreme atmospheric river (AR) events: the so-called\ud<q>Great Coastal Gale of 2007</q> in the\udPacific Ocean and the <q>Great Storm of\ud1987</q> in the North Atlantic. Results show that\udbetween 80 and 90 % of moisture advected by the ARs, and a high\udpercentage of the total precipitation produced by the systems have a\udtropical origin. The tropical contribution to precipitation is in general\udabove 50 % and largely exceeds this value in the most affected areas.\udLocal convergence transport is responsible for the remaining moisture and\udprecipitation. The ratio of tropical moisture to total moisture is maximized\udas the cold front arrives on land. Vertical cross sections of the moisture\udcontent suggest that the maximum in tropical humidity does not necessarily\udcoincide with the low-level jet (LLJ) of the extratropical cyclone. Instead,\udthe amount of tropical humidity is maximized in the lowest atmospheric level\udin southern latitudes and can be located above, below or ahead of the LLJ\udin northern latitudes in both analyzed cases

Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool