From the benchThe fog this morning is your best friend — overcast, low-light conditions are exactly what triggers the heaviest Baetis emergences on the Firehole. Position yourself at the head of the long meadow flats and watch for subtle sipping rises in the slick water; these fish are often keying on emergers just in the film, not fully hatched duns, so start with the CDC Rainbow Warrior or Quilldigon before switching to the parachute dry. As the fog burns off around 11 AM and the sun hits the water, water temps will climb and surface activity will slow — that's your cue to move to the shaded, deeper slots with a midge or small nymph, or work the grassy banks with a hopper or ant. Be off the water or targeting shaded pools by 2 PM ahead of any afternoon storm activity.