At the other end Ishmael Miller shot over and substitute Filipe Teixeira wasted a superb late chance.
St Johnstone welcomed back local boy, midfielder Kevin Moon, but lost Filipe Morais and Peter MacDonald to injury.
Inverness came back into the match and Filipe Morais finished off a good move with a fine volley before half-time.
Filipe Morais created an opening for the home side after 14 minutes but Jody Morris blazed over from 12 yards out.
Spain's Gonzalo Fernandez-Castano, Sweden's Peter Hanson and Jose-Filipe Lima of Portugal were alongside the English trio one shot off Cevaer's lead.
And Saints may have gone ahead when substitute Filipe Morais put Millar in on goal, but the midfielder dragged his shot wide.
Well defender Brian McLean headed the hosts in front from a 26th-minute corner but Filipe Morais drilled home following good work from Dougie Imrie.
Filipe Oliveira, of Springfield, Chelmsford, said poor weather conditions were forecast on Tuesday evening and said the council should have got gritting trucks out earlier.
Colin Montgomerie was a further shot back with Portugal's Jose-Filipe Lima.
West Brom are already minus Filipe Teixeira and Abdoulaye Meite.
Filipe Morais's delivery caused chaos in the St Mirren six-yard box and Steven Anderson's initial effort was deflected onto the post before Kenny Deuchar hooked the ball back towards goal.
St Johnstone boss Derek McInnes would have been dismayed to lose Kevin Moon, who was stretchered off in 54 minutes after a challenge by Mark Kerr, to be replaced by Filipe Morais.
The close season saw McInnes add Kenny Deuchar, Murray Davidson, Danny Grainger and Filipe Morais to a squad that contained a few experienced campaigners like Jody Morris, Paul Sheerin and Collin Samuel.
It spread to other flats including number 79, where victim Catherine Hickman, 31, lived and flat 81, where victims Helen Udoaka, 34, and her baby daughter Michelle had gathered with Dayana Francisquini, 26, and her children six-year-old Thais, and Filipe, three.
应用推荐