Con­di­tions in north­west Pa­cific af­fected mon­soon

DNA (Delhi) - - INDI - DNA Cor­re­spon­dent cor­re­spon­dent@dnain­

The rain­fall de­fi­ciency of five per cent of the long-pe­riod av­er­age (LPA) of south­west mon­soon sea­son was largely due to be­low par rain­fall in the sec­ond half of the sea­son dur­ing Au­gust and Septem­ber, the In­dia Me­te­o­ro­log­i­cal Depart­ment (IMD) said in its end of the sea­son re­port. Dur­ing the sec­ond half of mon­soon, north­west In­dia and Cen­tral In­dia saw rain­fall de­fi­ciency of 35 per cent of LPA and 21 per cent of LPA.

Ac­cord­ing to IMD’s anal­y­sis, there was above nor­mal ac­tiv­ity of low pres­sure sys­tems over the north­west Pa­cific dur­ing the sec­ond half of mon­soon, re­sult­ing in poor rains dur­ing the same pe­riod in In­dia.

“The be­low nor­mal rain­fall over the cen­tral and north­west In­dia dur­ing sec­ond half of the sea­son was also caused by the above nor­mal con­vec­tive ac­tiv­ity over south­ern hemi­spheric equa­to­rial trough,” the IMD’s re­port said. It added, thus, the Bay of Ben­gal branch of south­west mon­soon got de­flected to­wards south­east Asia ow­ing to strength­en­ing of west Pa­cific sys­tems.

The in­flu­ence of th­ese sys­tems man­i­fested in lesser low-pres­sure sys­tems. This year, 11 low pres­sure ar­eas formed in the first half of the sea­son with three of them in­ten­si­fy­ing into de­pres­sions, the re­port said. It added, on the other hand, dur­ing the sec­ond half of the sea­son, only three low-pres­sure sys­tems formed in the In­dian mon­soon re­gion with none of them in­ten­si­fy­ing into de­pres­sion.

“The to­tal num­ber of low­pres­sure sys­tem days dur­ing the sea­son had been only 39 as against the nor­mal of 58,” the IMD’s re­port said.


Ra­jasthan and Gu­jarat wit­nessed ex­treme heavy rain­fall—FILE

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