BWO's love overcast days. The bugs seems to hatch in greater numbers. More fish seem to rise on overcast days. I am not sure if that is truly the case or if the cooler moist air delays the duns drying of its wings. If the drying takes more time then the bugs are on the water longer and draw more attention/feeding from the fish below. More fish rise. Maybe it is both, more bugs hatching and bugs on the water longer. Now lets throw in a 3rd variable. Trout do not like bright light so perhaps on overcast days more fish are likely to rise.
BWO's are hatching right now on the South Platte in Eleven Mile Canyon. Dry fly fishing is great in the upper two and half miles. A size 24 parachute adams or a BWO parachute, usually does the trick. But you have to love these dreary overcast days and learn to look carefully. BWO's are not easy to see on the water and especially in overcast conditions.
Years ago at Deckers there was a spring snow storm that dropped snowflakes the size of half dollar coins. The BWO's started coming off like crazy and the fish rose all over the river. This went on for an hour or so and then the clouds parted and the sun came out. I could not find a single BWO or a single fish rising.
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