This ascii dataset contains NLDN cloud-to-ground strokes and NLDN LF cloud event data. The data format is as follows: (1) Date (MM/DD/YY) (2) Time (HH:mm:ss) (in milliseconds) (3) Latitude (degrees) (4) Longitude (degrees) (5) Polarity and Peak Current (kA) (6) Lightning event type (G for cloud-to-ground and C for cloud) (7) Chi square value (quality metric for the location estimate) (8) Length of the semi-major axis of the error ellipse (km) (quality metric for the location estimate)