The focus of SpeedyWeather.jl is to develop a global atmospheric model with simple physics, that can run at various levels of precision (16, 32 and 64-bit) on different architectures (x86 and arm are supported, GPUs planned).

Additionally, the model is written in an entirely number format-flexible way, such that any custom number format can be used and Julia will compile to the format automatically. In contrast to the original speedy the resolution (horizontal and vertical) is adjustable and some simple parallelism is included to run SpeedyWeather.jl efficiently on small clusters.

For an overview of the functionality and explanation see the documentation.

SpeedyWeather.jl is currently developed. Some things work, some don't. Stay tuned. Here is a teaser picture of some barotropic vorticity, simulated at T341 spectral resolution in single precision.

The main interface to SpeedyWeather.jl is

julia> using SpeedyWeather
julia> run_speedy(Float32,n_days=100,output=true);
Weather is speedy run 1:  49%|███████▍       |  ETA: 0:00:09 ( 3.71 ms/it)

and the arguments for run_speedy are described in src/default_parameters.jl.

SpeedyWeather.jl is the Julia version of the atmospheric general circulation model SPEEDY. Speedy's dynamical core is originally written by Isaac Held at GFDL and the physical parametrizations by Fred Kucharski, Franco Molteni and Martin P. King in Fortran77. Speedy was then translated to Fortran90 by Sam Hatfield in speedy.f90. SpeedyWeather.jl is then adopted from first translations to Julia by Sam Hatfield, but entirely restructured and only the parts of the conceptual algorithms are shared with the original Fortran versions.

SpeedyWeather.jl is registered in Julia's registry, so open the package manager with ] and

(@v1.7) pkg> add SpeedyWeather

which will install the latest release and all dependencies automatically. The very latest version is installed with

(@v1.7) pkg> add https://github.com/milankl/SpeedyWeather.jl#main

which pulls directly from the #main branch. Please use the current minor version of Julia, compatibilities with older versions are not guaranteed.