Monthly Archives: May 2017

Surface wind speeds and directions from MERA

Previous posts have discussed software tools for extracting and visualising data from GRIB archives. With some help, I’ve used Panoply to read and visualise surface wind speeds from the sample Met Eireann Reanalysis (MERA) data files.

Separate GRIB archives of the u- and v- components of the horizontal surface (10 m) wind velocity are provided. Panoply can import multiple datasets and it can also be used to combine the u- and v- components in order to visualise surface wind speeds and directions. This page from NASA’s Goddard’s Earth Science Data and Information Services Center describes how to do this.

Here’s an example of the output from 03:00, 1st June 2015, with prediction intervals of 1, 2 and 3 hours respectively: