The Sikkim flash flood, in which 14 people have been killed and 102 others are missing, has been so intense because it was the result of a cloudburst causing a glacial lake to overflow. A glacial lake outburst flood, or GLOF, usually results in more damage and destruction than a flood caused by excess rainfall alone. Around 1 am on Wednesday, the South Lhonak Lake, a glacial lake in the upper reaches of Sikkim, burst its banks following a cloudburst in the area. The lake is around 17,000 feet above sea level and satellite images showed that nearly 65% of its water was drained, flooding the Teesta River.