Residents can breathe easy in the next few days after a week-and-a-half of thunder squalls and tremors.

"There is no possibility of thunderstorm or rain in Patna and the adjoining districts in the next few days because of no mixing of easterly and westerly winds, which earlier created the unstable weather conditions," Patna Met director Ashish Sen told The Telegraph on Thursday.

The northern districts could, however, experience unstable conditions for the next 48 hours.

Nor'wester-induced mixing of easterly and westerly winds create unstable weather conditions, as the lighter moist easterlies are pushed above because of domination of westerly winds, leading to cloud formation and thunder. In meteorological parlance a Nor'wester is a storm that affects local weather in parts of eastern India in the spring. Even though Nor'westers, which bring storm and rain, are a common weather phenomenon in this region at this time of the year, this year it led to unstable weather conditions from the last week of March. The recent spell of unstable weather lasted for five days till Wednesday, while a thunder squall on April 21 led to loss of life and property and damage to standing crops.

Sudha Singh, a Raja Bazaar resident, said: "Even though summer is round the corner, I will welcome it with both hands because of the horrible experience with the weather this time. Thunderstorms and earthquakes have shaken my confidence. A stable and warm summer would be okay, as it's a normal thing for Patna."

Met director Sen said few of the north Bihar districts, including Sitamarhi, Madhubani, Darbhanga, Supaul, Araria, Purnea, Katihar, Saharsa and Kishanganj, were, however, likely to face unstable weather conditions in the next 48 hours. "After this period, weather in these districts, too, would become stable," he added.

He said the instability in weather conditions had become possible because the westerly winds have become dominant and there is no chance for the easterlies to interrupt it in the coming few days. On Thursday, westerly winds were blowing across most parts of the state at 10-12kmph.

"The temperature levels would start rising in the areas free of local weather conditions and would reach the level of normal maximum temperature of 38-39°C in the next few days. Once the westerlies' speed lowers, the day temperature would increase," Sen said.

He maintained that the most recent spell of unstable weather lasted for about five days, while normally it continues for just 72 hours. This prolonged phase has brought down the maximum temperature levels in Patna, which was hovering between 32 and 36°C - well below the normal day temperature for this time of the year.