Severe Thunderstorm Hits Eastern and Northeastern India

On April 13,2010,Tuesday a severe thunderstorm hit parts of India and Bangladesh.
This thunderstorm at 05Pm has vertical extent of 14km which later due to warm air feed from the ground soared to 18km by 22:47HRS. Ample moisture and instability with good Low level shears caused a tornado possible F0 with gusts over 100Km/hr. This one killed 116km and left many injured and homeless. The supercells were 408km away to N-NE of Kolkata,India. At 23:17, supercells moved to Bhagalpur and Purnia in Bihar.The preliminary reports indicate that it has affected mainly Dinajpur and
Jalpaiguri districts of West Bengal and Kishanganj district of Bihar, as also revealed
by the visual media reports. There are reports of uprooting of trees, damage to
communication/ electric lines and also damage to many houses. There are also
reports of some causalities, the maximum loss is reported from Dinajpur district.

THESE ARE KNOWN AS NOR-WESTER WHICH ARE VERY COMMON IN MARCH TO MAY IN BIHAR,JHARKHAND,WEST BENGAL AND NE INDIA WITH BANGLADESH. HIGH INSTABILITY IS ALREADY PRESENT AROUND THESE AREAS AND WHEN MOISTURE INCURSION OCCURS WITH SUFFICIENT HELICITY AND NO CAP STORMS ROTATES TO MESOCYCLONES AND FURTHER TO TORNADOES IN DOWNDRAFTS IF A STRONG UPDRAFT IS PRESENT. LOOKS LIKE 18TH APRIL,SUNDAY CAN WITNESS ANOTHER SEVERE THUNDERSTORM ROUND AS HAS BEEN ANALYZED BY ME,I SHALL MAKE A DETAILED UPDATE WITH SEPERATE MENTION AFTER ANALYSIS. PEOPLE THERE MUST BE READY TO WITNESS THUNDERSTORMS AS MOISTURE IS MOSTLY TO RETURN FROM BAY IN THIS WEEKEND


AKSHAY DEORAS