Unusual rapidly occurring and small-scale discharges in a narrow (1-2 km) region inside the most electrically active part of a thunderstorm, observed with a VHF-band (2 m wave-length) radar in East Georgia, USSR, were relatively stationary on the radar display, and had a maximum rate of about 200 per minute, an average duration of 12.5 ms, an estimated radar cross section a fraction of a meter to a few meters square, and an estimated length of a few meters to tens of meters. Occurence of quasi-stable discharges coincided with period of the highest altitude of the 50 dBZ-reflectivity core. It is proposed that the quasi-stable discharges are long sparks produced by the natural lightning-trig-gering mechanism inside the storm. This hypothesis appears to support observations on triggered lightning in the United States obtained with an instrumented aircraft and wire-trailing rockets.