In­cor­rect views

Down to Earth - - LETTERS - S VENKATARAMAN, FOR­MER DIREC­TOR, IN­DIA ME­TE­O­RO­LOG­I­CAL DEPART­MENT, VIA EMAIL

7KLV LV UHJDUGLQJ WKH OHWWHU k,0' PXVW XSJUDGHy E\ . .DLODVDQDWKDQ 0D\

.DLODVDQDWKDQ V FODLP WKDW ZHDWKHU fore­casts have failed to reach farm­ers is in­cor­rect. Farm­ers are be­ing pro­vided with not only weather fore­casts, but also with timely ad­vi­sories on ap­pro­pri­ate mea­sures to adopt. Th­ese ad­vi­sories are framed af­ter con­sul­ta­tions with crop spe­cial­ists. At present, there are over 20 mil­lion farm­ers avail­ing the P.LVDQ por­tal ODXQFKHG LQ

Se­condly, the sug­ges­tion by .DLODVDQDWKDQ WR DGRSW :HVWHUQ ZHDWKHU mod­els is sci­en­tif­i­cally in­cor­rect. It is well-known that weather sys­tems in low lat­i­tudes are af­fected by the Co­ri­o­lis force of earth and will not obey mod­els of high lat­i­tudes. For ex­am­ple, in the case of hail, for it to form at a lower lat­i­tude, say the equator, where there is more heat, the tropical thun­der­storms will have to reach greater heights to be­come hail­bear­ing. This would not be the case if hail has to form in a northerly or southerly lat­i­tude nearer to the poles, where there is less heat and so the pre­cip­i­ta­tion freezes eas­ily. More­over, the per­cent­age dis­si­pa­tion in hail size, which means the de­crease in the size of hail stones or their melt­ing will be higher in the trop­ics be­cause of the longer dis­tance of de­scent of the hail. How­ever, it is doubt­ful if In­dia ZLOO HYHU JHW WR WKH VWDJH RI DUWLILFLDO dis­si­pa­tion of hail-bear­ing clouds by seed­ing to re­duce the hail's de­struc­tive im­pact. Bur­gundy, a French wine­pro­duc­ing re­gion, is pro­tected by HailNet, where vines are cov­ered by nets to pro­tect them from hail. If hail dis­si­pa­tion by seed­ing is so easy and as­sured why do the Bur­gun­di­ans not re­sort to it?

Newspapers in English

Newspapers from India

© PressReader. All rights reserved.