"Standin' in the Rain"

I was thinking about "Standin' in the Rain" this morning and realized that the rather prominent descending violin phrases after the "Rainy day" lines (starting at ~1:55) may be intended to depict the falling rain.  The first spans an octave (Bb to Bb in Bb major, with the last Bb note repeated), and the second is even broader (Bb to Bb in Bb minor followed by a low Gb).