I think we all should be more interested in the effect that moderate to heavy rain can have on our engines during the normal idle setting during descent.
In the normal to high speed descent, if we encounter this level of rain, with the engines operating at idle, there is a marked increase in the percentage of water content ingested than there is during climb or cruise.
Enough to be a problem, can be!
At high speeds, with the engine at idle, in moderate/heavy rain, the N1 fan will only process a certain amount of air into the bypass/intake due directly to it's rotational speed(low).
The remaining excess volume diverts around the outside of the nacelle, but what of the rain droplets contained in that excess air volume?
Well, due to momentum effects, most of it continues straight into the intake, unable to change direction, as the air did.
The result being a very much higher percentage of water, with the resulting danger of a flameout, or surge.
Thats why it's good to unload the compressor a little in these situations by turning on engine anti-ice, or increasing the power(read RPM) a little, with some speed brake to compensate.
Cheers