Exercise 1: forecast - analysis difference

This short exercise will demonstrate some basic functionality of Metview, showing how to retrieve data from MARS, examine its structure, compute the differences between fields and visualise them.

First start Metview; at ECMWF, the command to use is metview4_new. (See Metview at ECMWF for details of Metview versions.)

1. Retrieve temperature analysis
   1. examine the retrieved data
   2. plot it and use a nice contour shading icon
2. Retrieve temperature forecast
3. Compute the difference
4. Plot the difference and use pos & neg contour icons
5. Generate a macro from the plot

Observation - analysis difference

1. Retrieve temperature analysis
2. Retrieve observation data
   1. examine the retrieved data
   2. plot obs data using standard synop station plotting
3. Filter temperature from observations
   1. plot using advanced symbol plotting
4. Compute the difference between obs and analysis
5. Plot the difference using advanced symbol plotting
6. Overlay with the original temperature field?
7. Generate a macro from the plot