At about 1942 the British War Office decided that the weather played a very important part in any theatre of war so increased the importance of the Meteorological Office. In doing this, they thought it'd be a good idea to liaise with the Russians, so they sent one of their officers, a Capt.Mark Rice to Russia to study their techniques with his counterpart, a certain Cmdr Rudolph Karpov.
Capt. Rice stayed with Cmdr Karpov and his family for a few weeks while they exchanged views on how they collected and collated data.
Following this, Cmdr Karpov returned with Capt. Rice and stayed with him and his wife and again discussed various ways of using this data.
All went extremely well, and they became firm friends, that is until one evening when they were discussing precipitation. Capt. Rice thought that the moisture in the air would turn decidedly colder and would produce snow, while Cmdr Karpov insisted that it would turn warmer and become rain.
This discussion soon developed into an argument and then to a heated one, when Mrs Rice, somewhat embarrassed that these two should be falling out over such a trivial matter, and wanting to cool the situation, stepped in with these never-to-be-forgotten words to her husband: Rudolph the Red knows rain dear.
In actual fact there's more truth in that story than at first you realise. I'm not sure it was in 1942, but it was certainly about that time and the Meteorological Office is still under the umbrella of the Ministry of Defence.