Typically, an Urban Forestry Specialist or Forestry Technician does an immediate on-site inspection. After assessing the problem, the forester removes the hazard if possible, or dispatches the city contractor.
If electrical wires are involved, they would call Cinergy to turn off the electricity or make the area safe.
The most typical tree emergencies that Urban Foresters deal with are those that are storm-related, such as:
tree down and blocking right-of-way
tree uprooted and blocking right-of-way
tree split out and blocking right-of-way
limb down and blocking right-of-way
limb/branch hung up in tree (hanger) and hazardous to right-of-way
limb/branch hung up in electrical wires