Following another of our numerous rain showers, a long white cloud formed at the base of the Bitterroot Mountains in the valley Tuesday.

The cloud is a combination of the moisture in the air and the effect of a mountain chain, driving the shape of the formation.

Mountain waves have been studied by meteorologists for quite a while. The moisture in the Bitterroot Valley has created even lower ground-hugging clouds, too - fog.

The weather pattern for the next few days includes more rain, by the way.