Weather Maps · GFS

Precipitable water maps — GFS

All the water vapour in the column of air, in millimetres, out to five days.

This GFS map shows precipitable water every 3 hours out to five days: all the water vapour in the column of air above a point if it condensed and fell, in millimetres. It does not mean that amount will fall, but it is a guide to how heavy rain could be: the higher it is, the more moisture there is, so a low or a storm passing over it can bring heavier rain. The map updates with each new model run; the run time and last update are shown under it. GFS is the American global model.