I then did a quick color study and also experimented with natural sponges for applying paint as I had in the on location study.
I then set the sketches aside in a portfolio - which I will most likely turn into finished paintings. I've got a number of "collections" like this of different subjects that I've set aside for a rainy day.
Each painting also adds a little more knowlege about what does and does not work in producing a desired effect. Its amazing what you will remember about a location when you spend a few hours painting and observing. I now don't get concerned if I cannot capture an effect accurately at the time (my observations are often ahead of my ability to capture them in paint) because I can revisit those subjects when I have further developed my skills.
On location sketches also help me develop a "bank" of resources to refer to in future studio work (rivers, clouds, et cetera).
I'd love to hear any tips others may have for working on location.