There was no g/m storm on May 7 and 8 expected by Meudon (May 4-6) and
and  SSM (May 6) but not expected by SEC. So the result is 1.5 : 2.0 : 0
And total May's score becomes 4 : 2.5 : 1.5
PS. In total score SEC was prized by 2.5 instead of 3 due to overestimation of its forecast
in the test on comments #19