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Bangladesh sees one of warmest winters
The coldest month January ended rather warm, with barely any cold wave days, setting this winter well on the trajectory to become one of the warmest in the country’s history.
www.newagebd.net
Bangladesh sees one of warmest winters
Emran Hossain 03 February, 2025, 00:14
The coldest month January ended rather warm, with barely any cold wave days, setting this winter well on the trajectory to become one of the warmest in the country’s history.
February is the last month of the three-month-long winter when cold waves occur but the temperature does not drop as much as in January, the second half of which coincides with the first half of the formidable winter month on the Bangla calendar —Magh.
Magh, used to bring punishing cold, so much so that it spawned myths like Magh makes even tigers shiver, has only 10 days to go with Sunday’s temperature hovered around 30C over vast swathes of the country, particularly cities and other urban areas.
Many said that they used ceiling fans day and night in the current peak of Magh with the Bangladesh Meteorological Department predicting the possibility of a brief cold wave before winter officially ends this month.
‘The average minimum temperature in January was 1.1C higher than what is usual,’ meteorologist AKM Nazmul Hoque told New Age.
January saw its lowest minimum temperature to drop to 7.3C on January 10 in Tetulia, which is also the lowest temperature recorded so far this winter.
Temperature dropped frequently below 7C over the last 15 years. Only four other Januaries have been as warm as the immediate past one, showed an analysis of 44 years of data preserved by the meteorology department.
The temperature did not drop below 7.3C, as it happened last in January in 2025, also in 1982, 1986, 2002 and 2009.
On January 28, 2024, the lowest temperature dropped to 5C at Dimla of Nilphamari. On January 20, the year before in 2023, the lowest temperature was recorded to be 5.6C in Srimangal of Moulvibazar.
In 2022, the lowest temperature was 6C, recorded on January 31 in Tetulia of Panchagarh.
Four cold waves, two lasting just one day each and the rest two three and four days, were recorded in this January.
January turning out this warm presented a sharp contrast to the beginning of winter in December when temperature saw a sharp drop middle of the month ushering in a cold wave. The temperature dropped to 8.4C on December 13 with the season’s first cold wave lasting for three days. The December 2024 was the coldest regarding the recorded lowest temperature in the 44 years since 1981, showed an analysis of the BMD data. The first cold wave this winter hit three weeks earlier than last year.
A cold wave, which can be mild, moderate and severe, reflects the fall of air temperature over a large area below 10C.
‘The circulation of air has been very strange this year,’ said Bazlur Rashid, a senior BMD meteorologist and climate researcher.
Winter arrives with the arrival of westerly, wind blowing from the west to east, particularly from the Mediterranean Sea, he explained.
This winter there has been a constant flow of wind from the Mediterranean, without almost any break, which was unusual, and the wind got blocked around Afghanistan, he said.
The strong westerly, which flows close to the surface, prevented Jet wind, upper atmosphere wind flowing above 18,000 feet, from taking its usual course.
Jet wind flows from the east to west, at a high speed exceeding 100kmph. The temperature in the jet wind starts at -20C. The temperature can reach -50C.
Jet wind descends close to the surface when westerly weakens, increasing the feeling of cold, which did not happen this year. Jet wind also got stuck around Afghanistan, almost never reaching either West Bengal or Bangladesh.
‘Jet wind needs to come down to 12,000 feet or even lower to lower the temperature and give the feeling of cold,’ said Bazlu, adding that the wind remained above 15,000 feet so far.
Jet wind usually passes over Bangladesh and its adjacent West Bengal during winter, which had not happened this winter.
Cloudless sky and absence of fog along with high land surface temperature has made the current winter feel rather warm, meteorologists have observed.
January was 99 per cent rain deficient as well, while December was 91 per cent rain deficient. Back to back low pressure formed in November and December, potentially contributing to cloudless skies by pulling clouds into them.
The temperature observations from Bangladesh showed a clear climate signal, with fewer and shorter cold waves in the recent decades, according to a BMD report titled ‘Changing climate of Bangladesh’, released in February last year.
Cold waves became concentrated in January in Dhaka division, the report said. There were some cases of cold waves in December and February as well, according to the report.
In one of the coldest areas of the country, Rangpur division, cold waves started early or mid-December throughout most of the period studied—1980–2023. The northern district recorded a cold wave even in November in 1981. But the period of cold waves appears to have been delayed over the past few years, starting at the third or fourth week of December or even in January, the report said.
Historically, cold waves were frequent in January and February but in recent years the end of February had been without any, the report said about Rangpur. In Rajshahi division, known for extreme heat during summer and intense cold during winter, the period of cold waves started in the first week of December up to 2006 but then decreased, indicating a delay in cold wave conditions.
In Rajshahi division in 2023, no cold spell was recorded in December at all. The number of cold wave days in December and February has decreased also, while a large number of cold wave days were observed in January throughout the period 1980–2023 in the division, the BMD report said.
Emran Hossain 03 February, 2025, 00:14
The coldest month January ended rather warm, with barely any cold wave days, setting this winter well on the trajectory to become one of the warmest in the country’s history.
February is the last month of the three-month-long winter when cold waves occur but the temperature does not drop as much as in January, the second half of which coincides with the first half of the formidable winter month on the Bangla calendar —Magh.
Magh, used to bring punishing cold, so much so that it spawned myths like Magh makes even tigers shiver, has only 10 days to go with Sunday’s temperature hovered around 30C over vast swathes of the country, particularly cities and other urban areas.
Many said that they used ceiling fans day and night in the current peak of Magh with the Bangladesh Meteorological Department predicting the possibility of a brief cold wave before winter officially ends this month.
‘The average minimum temperature in January was 1.1C higher than what is usual,’ meteorologist AKM Nazmul Hoque told New Age.
January saw its lowest minimum temperature to drop to 7.3C on January 10 in Tetulia, which is also the lowest temperature recorded so far this winter.
Temperature dropped frequently below 7C over the last 15 years. Only four other Januaries have been as warm as the immediate past one, showed an analysis of 44 years of data preserved by the meteorology department.
The temperature did not drop below 7.3C, as it happened last in January in 2025, also in 1982, 1986, 2002 and 2009.
On January 28, 2024, the lowest temperature dropped to 5C at Dimla of Nilphamari. On January 20, the year before in 2023, the lowest temperature was recorded to be 5.6C in Srimangal of Moulvibazar.
In 2022, the lowest temperature was 6C, recorded on January 31 in Tetulia of Panchagarh.
Four cold waves, two lasting just one day each and the rest two three and four days, were recorded in this January.
January turning out this warm presented a sharp contrast to the beginning of winter in December when temperature saw a sharp drop middle of the month ushering in a cold wave. The temperature dropped to 8.4C on December 13 with the season’s first cold wave lasting for three days. The December 2024 was the coldest regarding the recorded lowest temperature in the 44 years since 1981, showed an analysis of the BMD data. The first cold wave this winter hit three weeks earlier than last year.
A cold wave, which can be mild, moderate and severe, reflects the fall of air temperature over a large area below 10C.
‘The circulation of air has been very strange this year,’ said Bazlur Rashid, a senior BMD meteorologist and climate researcher.
Winter arrives with the arrival of westerly, wind blowing from the west to east, particularly from the Mediterranean Sea, he explained.
This winter there has been a constant flow of wind from the Mediterranean, without almost any break, which was unusual, and the wind got blocked around Afghanistan, he said.
The strong westerly, which flows close to the surface, prevented Jet wind, upper atmosphere wind flowing above 18,000 feet, from taking its usual course.
Jet wind flows from the east to west, at a high speed exceeding 100kmph. The temperature in the jet wind starts at -20C. The temperature can reach -50C.
Jet wind descends close to the surface when westerly weakens, increasing the feeling of cold, which did not happen this year. Jet wind also got stuck around Afghanistan, almost never reaching either West Bengal or Bangladesh.
‘Jet wind needs to come down to 12,000 feet or even lower to lower the temperature and give the feeling of cold,’ said Bazlu, adding that the wind remained above 15,000 feet so far.
Jet wind usually passes over Bangladesh and its adjacent West Bengal during winter, which had not happened this winter.
Cloudless sky and absence of fog along with high land surface temperature has made the current winter feel rather warm, meteorologists have observed.
January was 99 per cent rain deficient as well, while December was 91 per cent rain deficient. Back to back low pressure formed in November and December, potentially contributing to cloudless skies by pulling clouds into them.
The temperature observations from Bangladesh showed a clear climate signal, with fewer and shorter cold waves in the recent decades, according to a BMD report titled ‘Changing climate of Bangladesh’, released in February last year.
Cold waves became concentrated in January in Dhaka division, the report said. There were some cases of cold waves in December and February as well, according to the report.
In one of the coldest areas of the country, Rangpur division, cold waves started early or mid-December throughout most of the period studied—1980–2023. The northern district recorded a cold wave even in November in 1981. But the period of cold waves appears to have been delayed over the past few years, starting at the third or fourth week of December or even in January, the report said.
Historically, cold waves were frequent in January and February but in recent years the end of February had been without any, the report said about Rangpur. In Rajshahi division, known for extreme heat during summer and intense cold during winter, the period of cold waves started in the first week of December up to 2006 but then decreased, indicating a delay in cold wave conditions.
In Rajshahi division in 2023, no cold spell was recorded in December at all. The number of cold wave days in December and February has decreased also, while a large number of cold wave days were observed in January throughout the period 1980–2023 in the division, the BMD report said.