Foggy conditions are set to resume over north-west India, parts of adjoining Central India and East India.

A causative western disturbance has moved in from over north Pakistan and has brought adjoining Jammu and Kashmir under its foot print on Friday.

LONG DISTANCES

Western disturbances travel long distances from as far away as Mediterranean and pick up moisture along the way to warm up the Arctic air during this time of the year.

They track over south-west Asia and the West Asia before impacting Afghanistan, Pakistan and northwest India in that order.

The moisture carry gets precipitated as snow, ice, fog or rain depending on the area impacted — hills or plains.

The India Meteorological Department (IMD) has forecast rain or snow at one or two places over Jammu and Kashmir on Saturday and at a few places, thereafter.

FOG FOR PLAINS

Himachal Pradesh and Uttarakhand to the immediate south and southeast would get similar weather on Saturday and Sunday as the weather disturbance heads east.

Fog or shallow fog has been forecast over parts of the adjoining plains in Punjab, Haryana, Delhi and west Uttar Pradesh during morning hours.

Maximum and minimum temperatures over northwest India during may dip by about 2 deg Celsius after two days once the disturbance exits the region.

This is because the air loses the warmth associated with rising air motion and moisture upfront of the disturbance.

COOL CLIMES

The rear of the system witnesses subsidence of air (sinking motion) which brings to bear the Arctic air chill.

A fresh western disturbance may affect western Himalayan region from early next week, the IMD said.

The 24 hours ending Friday morning saw minimum temperatures stay below normal by 4 to 6 deg Celsius over southeast Madhya Pradesh, Vidarbha, Marathwada, North Karnataka and interior Andhra Pradesh.

Cool north-westerly air continued to waft into the space ceded by warmer easterlies to north easterlies as the low-pressure area in the Bay of Bengal bid its time to rev up.

RAIN OUTLOOK

Odisha, Tamil Nadu, Kerala, parts of Madhya Pradesh, Maharashtra and Andhra Pradesh too witnessed cooler climes.

The lowest minimum temperature of 8.2 deg Celsius was recorded at Amritsar in plains of the country.

As for the South, rain or thundershowers might break out at one or two places over south Tamil Nadu and south Kerala during the next two to three days.

An extended outlook appeared more promising, with thundershowers being forecast for Tamil Nadu, Kerala, Lakshadweep, coastal Andhra Pradesh and coastal Odisha.

vinson.kurian@thehindu.co.in

(This article was published on November 16, 2012)
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