Folks sit down around a fire to succor themselves warmth in Hyderabad, December 2025.
| Photograph Credit score: SIDDHANT THAKUR/The Hindu
Now not like the stormy remnant of Cyclone Ditwah shut to Chennai earlier this month, frosty waves can’t linger. In its assign, if they’re occurring repeatedly, it must be since the formula required for an surprisingly low hour of darkness temperature are moreover staying in assign. And over Telangana factual now, the India Meteorological Division (IMD) has pointed to a mix familiar in iciness: dry air, particular skies, and continental winds.
The air mass over Telangana Express has been surprisingly dry of tiring. When humidity is low, the ambiance holds much less water vapour, which is one of doubtlessly the most important greenhouse gases shut to the ground. With much less water vapour to trap warmth, the ground loses energy extra successfully after sunset. Certain skies succor this function because clouds that would possibly well per chance simply otherwise maintain and re-radiate one of the most important outgoing warmth are absent. Meteorologists agree with already said the continuing frosty wave is partly linked to dry winds blowing north and northeast and particular skies at evening.
Second, the northerly and northeasterly ground winds bring cooler, drier air from inland facets of India as an replace of air from the Bay of Bengal, which is extra moist. This real cooling retains the day-to-day minimum temperature down even when the daytime temperature is ‘recurring’ since every evening begins with a cooler beginning point. Telangana had a frosty wave warning in mid-November nevertheless it with out a doubt has perceived to transfer on because these low-level winds haven’t shifted, thus the native air mass has remained frigid and dry.
Third, in an announcement issued on December 11, the IMD said frosty-wave prerequisites had happened at remoted areas over Telangana and warned that such prerequisites were “very seemingly” over the Express, as successfully as in north interior Karnataka, one day of December 12-14. The bulletin moreover said there would possibly well be “no important replace” in minimum temperatures over “final facets of the nation” one day of the next week. That is, the frosty patterns gained’t spoil in a unexpected attain.
In the plains, The IMD considers frosty-wave prerequisites when the minimum temperature falls to 10°C or under in the plains and is substantially under recurring, i.e. a unfavourable departure of 4.5ºC to 6.4ºC. Any temperatures under that lead to a “severe” frosty wave. Thus, facets of Telangana are currently in the grip of a frosty wave.
A earlier western disturbance is anticipated to persuade the western Himalaya from December 13 and the IMD has said there would possibly be on the overall a 2-4ºC upward thrust in the minimum temperature between December 13 and 15 because the elevated pattern evolves with the decrease level easterlies.
Printed – December 12, 2025 01:29 pm IST
