A tornado over Orissa m April 1978metnet.imd.gov.in/mausamdocs/533214.pdf · the hail of diameter...
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l Mausam, (1982), 33, 2, 235-240 551.515.3(541.5) " 1978" A tornado over Orissa m April 1978 ASHlM K. GHOSH Meteorological Centre, Patna ( Received 8 October 19 80) lIT': - I. I9 78 .a <:R'IlR "" f;rofj.;; om. '"'" ij ...... -.: "" """'" fio'IT "'" I .m: ii ..ro """ ij <l"lfir .am .. of <it<: om...r-'i "" :u;m'i .a ..,;r lJt I '"" ij mm .. """: qf<F .... Fd.,l "" fio'IT "'" I ABSTRACf . An analytical study of a torn ado which struck parts of districts Keonjhnr and Cuttack in Orissa on 16 April 1978, causing large scale devastations of property and loss of human and animal lives, has been made. Synoptic situation responsible for its formation have been d iscussed. 1. Intrcductlou 11 was 1630 1ST on 16 April 1978 when a tornado struck the village of Purunabandhaguda in district Keonjbar, Orissa and wiped it out completely. All together eleven villages in the dislriets of Keonjhar and Cutlack sufTered losses due to Ihe impact of the storm covering an area of about 50 sq. km and having a population of 6000. According 10 the Slate Government about 90 per cent inhabitants in seven villages in Ghasi- pura block of Anandpur sub-division of Keonjhar district and four villages in Dangadi and Korai blocks of Jaipur sub-divi sion of were affected. 11 is stated that Ill-fated village of Purunabandhaguda suffered losses of 141 human lives and 231 heads of cattle (Figs. 1 & 2). OD record there is only ODe othe r tr onad o which occurred in Orissa OD 12 May 1976 (Gupta and Ghosh 1978) in which seven yillages in Balasore district were affected. Th IS, also cau sed loss of human and ani mal lives and damage to property. 1.1. General description path, it destroyed everything, shattering houses, slashing and uprooting trees and sucking lip cattle or whatever came on its way, The water of a pond in the village Purunabandhaguda was Slicked out and fishes and mud thrown out. The debris was thrown to the northeast corner of the village. The branches nf trees were found to be twisted at a height of 6 to 8 feet and those that were uprooted fell in Ihe modal direction of east to south. The wind speed has been estimated to be 150 to 2 00 kmph and duration 16 to 17 minutes. A newspaper report relates weird and fearful itories. A ten month s old baby was suddenly lifled up some 20 feet into air as though by diabolical hand and propelled forward some 30 yards and then suddenly and mysteriously gently put down on a thick hcep of straw so that she did not get a scratch on her body. A 25 year old woman was also lifted up from the same spot and at the same time, taken some distance and dashed violently against a tree so that she lost an eye. A man of the same place had fist size hail hit his waist with a stunning blow. While he sat down in pain he saw another hail hit his hullock and break its neck. W= updraft velocity required to support the hail of diameter d. From the size of the hail as described above a rough estimate can be made about the probable updraft by using the equation (Wichmann 195 1). W [ 2 PI dg l! 3 p, k According to the accounts the eye wit- nesses, prior to the tornado, a big ball dark cloud with luminous red hand around It suddenly appe ared in the sky in the northwest direction. Th is was followed by .. terrific sound of thunder bolt and of whirling .,,:,nd that churned the area. Funnel cloud was visible and the tornado moved from northwest to sout!,- where, east for a distance of about 16 to 17 km. On It. (235)
Transcript of A tornado over Orissa m April 1978metnet.imd.gov.in/mausamdocs/533214.pdf · the hail of diameter...
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Mausam, (1982), 33, 2, 235-240
551.515.3(541.5) " 1978"
A tornado over Orissa m April 1978
ASHlM K. GHO SHMeteorological Centre, Patna
(Received 8 October 1980)
lIT': - I . ~ I 9 78 .a~~ <:R'IlR ""~ f;rofj.;; om. '"'" ij~ ......-.: ""~""" """'" fio'IT "'" ~ I~ .m: ii ..ro """ ij <l"lfir .am.. of <it<: om...r-'i "" :u;m'i .a..,;r lJt I ~ '"" ~ ij m m .. """:~~ qf<F.... Fd.,l ""~ fio'IT "'" ~ I
ABSTRACf. An analytical study of a tornado which struck parts of districts Keonjhnr andCuttack in Orissa on 16 April 1978, causing large scale devastations of property and loss of humanand animal lives, has been made. Synoptic situation responsible for its formation have been d iscussed.
1. Intrcductlou
11 was 1630 1ST on 16 April 1978 when atornado struck the village of Purunabandhagudain district Keonjbar, Orissa and wiped it outcompletely. All together eleven villages in thedislriets of Keonjhar and Cutlack sufTered lossesdue to Ihe impact of the storm covering an areaof about 50 sq. km and having a population of6000. According 10 the Slate Government about90 per cent inhabit ants in seven villages in Ghasipura block of Anandpur sub-division of Keonjhardistrict and four villages in Dangadi and Kora iblocks of Jaipur sub-divi sion of ~utlack di~trictwere affected. 11 is stated that Ill-fated villageof Purunabandhaguda suffered losses of 141human lives and 231 heads of cattle (Figs. 1 & 2).
OD record there is only ODe othe r tronad owhich occurred in Orissa OD 12 May 1976(Gupta and Ghosh 1978) in which seven yillagesin Balasore district were affected. Th IS, alsocaused loss of human and animal lives anddamage to property.
1.1. General description
path, it destroyed everything, shattering houses,slashing and uprooting trees and sucking lipcattle or whatever came on its way, The waterof a pond in the village Purunabandhaguda wasSlicked out and fishes and mud thrown out. Thedebris was thrown to the north east corner of thevillage. The branches nf trees were found to betwisted at a height of 6 to 8 feet and those tha twere uprooted fell in Ihe modal direction of eastto south. The wind speed has been estimated tobe 150 to 200 kmph and duration 16 to 17minutes.
A newspaper report relates weird and fearfulitories. A ten month s old baby was suddenlylifled up some 20 feet into air as though bydiabolical hand and propelled forward some 30yards and then suddenly and mysteriously gentlyput down on a thick hcep of straw so that shedid not get a scratch on her body. A 25 yea r oldwoman was also lifted up from the same spotand at the same time, taken some distance anddashed violently against a tree so that she lostan eye. A man of the same place had fist sizehail hit his waist with a stunning blow. Whilehe sat down in pain he saw another hail hit hishullock and break its neck.
W= updraft velocity requ ired to supportthe hail of diameter d.
From the size of the hail as described above arough estimate can be made about the probableupdraft by using the equa tion (Wichmann 1951).
W ~ [ 2 PI dg l!3 p, k
According to the accounts o~ the eye witnesses, prior to the tornado, a big ball shape~dark cloud with luminous red hand around Itsuddenly appe ared in the sky in the northwestdirection. Th is was followed by dark~es.s an~ ..terrific sound of thunder bolt and of whirling .,,:,ndtha t churned the area. Funnel cloud was visibleand the tornado moved from northwest to sout!,- where,east for a distance of about 16 to 17 km. On It.
(235)
