Perfect Mayfly Weather: Overcast, Drizzle, and No Wind

“The perfect conditions for fishing dry flies is overcast, drizzle and no wind. The bugs in this case — Pale Morning Duns, Cahill’s, and Pale Evening Duns. This is the way it works: When the bugs come to the surface to hatch and the humidity is high or it’s raining, it takes them a long time to dry their wings and fly off; they drift hundreds of feet struggling to get airborne.” Randal Sumner describes catching the perfect hatch — sans clients — in the Yakima Herald Republic.