mighty big for cinders usually 1 to 2 " around here plus they usually start around the may full moon when water is warmer

about cinder worms
Cinder worms generally measure 1 to 4 inches long. They have a black heads and pinkish red to brownish bodies. These worms spend most of their lives burrowing in the mud until the time and temperature is right to spawn. At that time, they will migrate to the surface and mate.
Season
May start as early as late April and last through the month of June and is directly related to the water temperature.
Temperature
Ideal water temperatures range from the mid 50’s to the mid 60’s. The length of the season may be shortened by an unseasonably rapid rise in water temperature.
Moon cycle
Each emergence begins near the time of the full moon. The emergence increases to a maximum intensity during successive nights and decreases to a low point coinciding with the third quarter moon phase. The emergence rises and falls again with the new moon and subsides shortly thereafter. Worms may swarm on any night during their mating cycle, but most of the activity occurs around the new and full moons. Many believe three to four days before a new or full moon marks the peak of the emergence.