Dense fog may lower visibility during Republic Day celebrations in Delhi


PTI, Jan 25, 2024, 2:31 PM IST

Moderate to dense fog may affect visibility during the 75th Republic Day celebrations in the capital on Friday, the India Meteorological Department (IMD) said on Thursday.

The IMD said people would be able to see up to only 400 metres until 8.30 am on Friday due to foggy weather. The visibility levels may thereafter improve to 1,500 metres by 10.30 am.

The minimum temperature is likely to settle in the range of 5 to 7 degrees Celsius, the Met office said.

The absence of active western disturbances (WD) ”weather systems that originate in the Mediterranean region and bring unseasonal rainfall to northwest India ”is one of the primary reasons behind the blinding layer of fog persisting over the plains in the region since December 25, the IMD said.

Generally, five to seven WDs impact the region during these months. The region has not seen any strong WD this winter so far, it said. Two WDs have affected the country so far — one in December and another in January — but their impact remained confined to Gujarat, north Maharashtra, east Rajasthan, and Madhya Pradesh.

Fog formation requires three conditions: weak low-level winds, moisture, and overnight cooling. Strong WDs, characterised by strong winds and precipitation, disrupt these conditions.

The lack of active WDs can also be attributed to the prevailing El-Nino conditions, abnormal warming of surface waters in the central Pacific Ocean.

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