Patna: After two days of cloudy conditions during which the city received a little rainfall also, Patna on Valentine's Day witnessed a comparatively clear weather. Even though some cloudy patches were there in the sky in the early morning, the sun started shining brightly in the forenoon.

Residents, however, may witness few a more cloud patches till Thursday, said weathermen.

"A western disturbance is passing from the area adjoining Bihar-Jharkhand border and parts of south and east Bihar may witness cloudy conditions due to its impact. One or two places in the eastern Bihar region may also receive some rainfall under the impact of this phenomenon," meteorologist at Patna Met office Sandeep Kumar said.

He, however, made it clear that the affected areas will start witnessing clear sky from Friday onwards.

The western disturbance is a low-pressure area or extra-tropical storm that originates in the Mediterranean Sea area and moves eastwards. It enters India through Pakistan and Afghanistan and causes winter rain in several parts of north-western India and its impact is sometimes felt right up to Bihar and areas falling east of the state when it crosses this region during its eastward journey.

The minimum temperature level starts to increase when a western disturbance approaches an area. Cloudy conditions and some rainfall also accompany the arrival of this weather system.

As far as the temperature level is concerned, Patna and most parts of the state are expected to witness normal or below-normal day temperature in coming three-four days. The normal day temperature for Patna is around 26°C.

Also residents will have to brave windy conditions. "The north-westerly wind is blowing these days in the state at a speed of 15 to 20 km per hour," said the meteorologist.

He said the weather may witness some change around February 18 as one more western disturbance is heading towards India.

"At present, the system is located in Pakistan and its exact impact on the local weather would be known once it approaches Bihar or adjoining areas," Sandeep said.