From the benchThe Firehole's geothermal warmth is your biggest ally today — at 59°F the fish are active and bugs are hatching even with snow in the forecast. Focus your morning on nymphing the slower, steaming flats and thermal seams with small midge and BWO patterns on 6X or 7X fluorocarbon, keeping your rig within 18-24 inches of the bottom. As the temperature climbs toward the 41°F air high around midday, watch for BWO duns on the surface and be ready to switch to a dry fly quickly — the window can be short on a cloudy, precipitating day like today. Remember that fishing is only permitted until 2 PM on the Firehole, so plan your access and wade time accordingly to make the most of the midday hatch.