Weakening Westerlies to bring some respite from Hot Weather in Chennai

The last couple of days has seen weather in Chennai resemble summer days with high day time temperatures and uncomfortable evenings.  Thanks to clearer skies and strong Westerlies places all along the Coastal TN between Chennai & Nagappattinam have been seeing fairly high day time max temperatures.  Yesterday was not exception with both the Chennai observatories recording 100°F with Nungambakkam hitting 38.2°C which was the highest in  two months.


The uncomfortable nights set us to understand how different in this year from the last few years.  If one were to observe the day time maximum temperatures this year has been hotter than only 2015 with all the other years similarly hot if not hotter.  But the night time temperatures say different story with 2016 being the warmest during the nights.  2014 was also seeing mostly dry weather at this time of the year indicating the crucial role overnight thunderstorms play in the region modulating night time weather in Chennai. Weather_Update_1

The Westerlies are expected to slow down bringing a marginal reduction in temperature over most parts of Tamil Nadu from today.  Yesterday we already saw a proper sea breeze front develop towards the evening and move inland with not much resistance from Westerlies.  While we may not see a good reduction in temperatures because the upper air moisture is less due to weak monsoon conditions prevailing in the West Coast thereby making it more clearer skies.  Today we could see some partly cloudy skies during the second half of the day over Chennai which is likely to modulate the day time maximum temperature getting it to settle around 35 /36 degrees


Monsoon continues to be weak in the West Coast, south of Goa which is indicated by the lesser thunderstorms developing as well in the interior regions of Peninsular India.  The ghat sections of Maharashtra & North Karnataka will continue to get heavy rains in a few places making it one of the wettest regions in the world at this time.  Numerical Models indicate sea breeze to move inland today as well in coastal Tamil Nadu which is likely to trigger isolated thunderstorms once again.  But due to poor upper level support these thunderstorms are likely to be weak providing moderate rains to smaller areas and unlikely to develop into widespread rains.