The 24 Hours of Le Mans is not far away now and festivities begin this weekend with the Le Mans Test Day at Circuit de la Sarthe. There are two scheduled test sessions for Sunday, one from 9:00am-1:00pm and another from 2:00pm-6:00pm local time.
An upper level low pressure system will move off the western coast of Europe, between the North Atlantic Ocean and the Celtic Sea, Saturday night into Sunday. To start test day, winds at the upper levels will be relatively calm and dry from the south, resulting in some clear skies aloft. Winds from the west to southwest will bring some moisture off the Mediterranean Sea, resulting in some partly cloudy skies. With the addition of winds from the west and southwest at the surface, expect some warmer than average temperatures during the first test session in the low-to-mid 60’s F, or in the mid-to-upper teen’s C. As the day progresses and the second test session is underway, winds in the upper levels will strengthen slightly and shift direction towards the southwest, bringing moisture off the Bay of Biscay into the area. With the addition of moisture already present in the low levels, there is a threat of scattered showers in the area and has the possibility to interfere with the second session. Overall southerly flow in the atmosphere will result in a high temperature for the day in the low-to-mid 80’s F, or upper 20’s to low 30’s C.