Weather Maps · ECMWF

Precipitable water maps — ECMWF

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

Contains modified ECMWF data, licensed under CC BY 4.0

This ECMWF 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. ECMWF is the global model of the European Centre for Medium-Range Weather Forecasts.