Odisha will see a fresh and more noticeable decline in minimum temperatures after December 5, the India Meteorological Department (IMD) has warned, reversing a brief period of milder evenings observed throughout most of the state.
According to the weather agency, moisture intrusion from two active systems over the Bay of Bengal caused the recent short-term rise of roughly two to three degrees in numerous areas. These gains will be lost once winter regains its intensity in the first week of December.
Transient Warmth Associated with Twin Bay Systems
Two active weather systems in the southwest Bay of Bengal and close to the coast of Sri Lanka were blamed by IMD for the recent rise in nighttime temperatures.

The forecast states that these systems suppressed the typical radiational cooling that intensifies the nighttime cold in late November by injecting large amounts of water vapor into the lower atmosphere. According to the IMD, this mechanism explains why, despite the persistence of winter conditions in interior pockets, minimum readings increased by two to three degrees in numerous districts over the past few days.
One of the systems, which developed off the coast of Sri Lanka and strengthened into Cyclone Ditwah, is predicted to make landfall this weekend close to the Chennai coast.
According to the weather service, Ditwah won't have a direct negative effect on Odisha. However, peripheral circulation from the systems is anticipated to temporarily lessen evening cooling in coastal and adjacent regions, according to officials.

After December 5, there will be a significant return to cooler conditions.
The MeT also stated that after December 5, a more pronounced and extensive decline is probably in store. A more established winter phase will begin around the end of the first week of December, with the return of chilly winds and decreased humidity contributing to evening cooling.
While interior stations continued to record significant reductions, most districts were impacted by the brief warming. Phulbani recorded 8.5°C, Jharsuguda 9.2°C, Angul 9.6°C, and Bhawanipatna 9.8°C, according to recent data, suggesting that even during the brief warm spell, some areas are still experiencing cold.