Formula One championship leader Mark Webber gave Red Bull their 12th pole position in 13 races this season at the Belgian Grand Prix Saturday. The Australian, favored by a late flurry of rain that prevented rivals from matching his time in final qualifying, ended a run of four successive poles for German teammate Sebastian Vettel. McLaren's Lewis Hamilton joined Webber on the front row, with Renault's Robert Kubica third and Vettel fourth. The hopes of Ferrari's Fernando Alonso were scuppered by the fickle conditions and he will start 10th. Webber, who celebrated his 34th birthday at the fast and flowing track on Friday, leads 2008 champion Hamilton by four points in the standings with seven races remaining, including Sunday's. It was his fifth pole of the season, sixth of his career and first since Turkey in May. The driver on pole at Spa has failed to win four times out of the last five races here. Only 13 times in 43 races at the circuit has the winner started from the top slot. Hamilton, back on the front row for the first time since he took pole in Canada in June, looked forward to challenging Webber in the race. The Briton had been fastest in the second part of the session, ahead of teammate and reigning champion Jenson Button who qualified in fifth place. The first part was more like a race than qualifying, with drivers jostling for position on the road after the session was stopped when Renault's Russian Vitaly Petrov spun and clouted the barriers. With a darkening sky threatening rain at the re-start, the cars lined up at the pit-lane exit and streamed out nose-to-tail at the green light. Brazilian Lucas di Grassi then spun at turn 14 and hit the Lotus of Italian Jarno Trulli, with seven-time world champion Michael Schumacher expertly carving through the melee in his Mercedes. The German, back at his favorite track at the age of 41, qualified 11th but will start in 21st place due to a penalty imposed at the previous Hungarian Grand Prix for a move on former Ferrari teammate Rubens Barrichello.