Residents across Tamil Nadu can expect a mix of mild winter chill, patchy fog, and isolated rainfall over the next couple of days, according to the latest advisory issued by the Regional Meteorological Centre.  The weather department has forecast moderate early-morning fog in several western and north-western districts, particularly in the hilly and interior regions. Districts including Nilgiris, Salem, Krishnagiri, Dharmapuri, Tirupathur, Vellore and Ranipet are likely to wake up to misty conditions during the pre-dawn and early hours. Reduced visibility may affect commuters and motorists on highways and ghat roads, prompting authorities to advise caution during morning travel. In contrast to the foggy conditions in the western belt, parts of southern Tamil Nadu and the fertile delta districts are expected to receive light rainfall on Thursday. The meteorological centre has predicted scattered, light showers at one or two places across these regions. Karaikal and adjoining coastal areas may also witness brief spells of rain. Though the rainfall is not expected to be intense, it could provide temporary relief from the prevailing dry weather and …