Reason for high humidity
A trough of low pressure, which is running from central Pakistan to Gangetic West Bengal across Haryana, east Uttar Pradesh and Bihar is responsible for this high humidity. The north-south oscillation of this trough keeps on changing the wind pattern from westerly in the day time to easterly during late evening to early morning hours.
Within 2 hours from 8.30 am the wind pattern changed quickly from south easterly to north westerly bringing down the humidity to 36% from 67% in the early morning hours.
However, the moisture still persists in the air and only a persistent flow of dry westerly winds for 2-3 days could reduce the chances of high humidity returning back to the national capital. This scenario seems unlikely now as Southwest Monsoon is quickly progressing to Central and east India therefore, the pattern of winds are shifting from north westerly to south easterly.
As predicted by Skymet Meteorology Division in India temperature has been rising. From 40.6°C on Sunday it rose to record 43.3°C on Tuesday. And the only relief now could be rain as temperature will come down considerably with a good spell just like on the 14th of June when maximum came down to 36.4°C.
Dust and thunderstorm accompanied by strong winds are likely at few places in Delhi/NCR during the next 2 days with some chances of rain. But scattered showers with few good spells is likely to commence from the 21st onward due to a trough along the foothills of the Himalayas from northwest plains to north Bay of Bengal across east Uttar Pradesh, Bihar, Bengal, Jharkhand, Odisha and Chhattisgarh.
According to the latest weather update by Skymet Meteorology Division in India, winds coming from the west direction are less hot than those experienced last week when temperatures had risen to mid-forties and above.
Southwest Monsoon will more or less keep its rate over Delhi/NCR but the overall frequency and intensity of Monsoon could be less due to an El Nino year.
picture courtesy- Live India