The Clouds Group was led by Robin Hogan while he was a full-time academic in the Department of Meteorology at the University of Reading. He moved to ECMWF in 2014, retaining 5% at the University of Reading until 2026 when this dropped to 0% and he became Visiting Professor. The Clouds Group pages have now been largely removed, except for the following pages with useful links and code:

• Adept automatic differentiation library: Fast automatic computation of adjoints and Jacobians from C and C++ algorithms
• Stochastic cirrus model: A simulator to generate realistic 3D cirrus fields using Fourier techniques
• Multiple scattering algorithms: A fast forward model for calculating the effect of multiple scattering on radar and lidar
• Variational rain-hail retrieval: A retrieval algorithm for polarimetric radar
• Maxwell2D: Animations of the propagation of electromagnetic waves to understand a wide range of atmospheric phenomena
• Self-Similar Rayleigh-Gans Approximation: C and Matlab code demonstrating this method to compute microwave and millimetre-wave scattering properties from aggregate snowflakes
• SPARTACUS: Fortran and Matlab implementations of the SPARTACUS 3D radiation algorithm applied to urban and vegetation canopies

In the unlikely event that you are missing something else, visit the archived version of the Clouds Group home page.