Formation of a COL zone in Uttarakhand in mid Jun2013: Formation of a COL zone in Uttarakhand in mid Jun2013 A COL zone is the area between two anticyclones and is characterized by very weak winds. Usually thunderstorms move, distributing the precipitation over a large region, resulting in “normal rainfall”. However, under the influence of weak wind fields in a COL zone, these clouds do not move; resulting in a cloud burst or continuous heavy downpour . It is quite common for north west India to lie under the mid and upper tropospheric COL zone between the west Asian and Tibetan high, making this region prone to heavy rainfall. The COL zone location varies on a day to day basis and Uttarakhand, Himachal Pradesh, Punjab, J&K, Ladakh, and Haryana all come under its sway.
Presence of a western disturbance complicates issues: Presence of a western disturbance complicates issues Lightning detection equipment detects thunderstorm activity in Uttarakhand due to a western disturbance in the region
IR images of cloud movement: IR images of cloud movement Uttarakhand disaster (14-18Jun2013)
All IR images are from MOSDAC: All IR images are from MOSDAC
PowerPoint Presentation: District wise rainfall data of Uttarakhand Source : SANDRP