You're too late to profit on this particular drought- if profits are to be made at all.
Wildfires are pretty much going to be an on-going event for the West. Pine beetles are killing a significant portion of these forests and once dead it doesn't take much to set them ablaze.
I think one of the best investments long term would be in water, though again profits may not be realized from THIS particular drought. Demand for clean/fresh water is expected to rise by about 40% in the next 15 years and we are sucking dry aquifers and polluting rivers and other sources of fresh water. Look into water treatment, desalinization, irrigation and water technology companies. $PHO andare $PIO and ETFs specializing in water.