# Precipitation Susceptibility

The `PrecipitationSusceptibility.jl`

module contains functions for determining the precipitation susceptibility rates due to various processes for 2-moment microphysics schemes, as described in [53].

The precipitation susceptibility describes the rate of change of precipitation production due to some moment of the particle size distribution:

For some partial moment $X$, such as $q_{liq}$, $q_{rai}$, $N_{liq}$, or $N_{rai}$ and some process rate of precipitation production $r$, such as autoconversion, accretion, etc, this is defined as:

\[\frac{\partial \ln r}{\partial \ln X}\]

The total precipitation susceptibility, then, is

\[\frac{\partial \ln PP}{\partial \ln X} = \sum_{r \in R} \frac{r}{PP} \frac{\partial \ln r}{\partial \ln X}\]

Where $R$ is the set of all process rates that contribute to precipitation production.

Example reproducing Fig. 2 From [53]:

`include("plots/PrecipitationSusceptibilityPlots.jl")`

```
CairoMakie.Screen{SVG}
```