The wind was swirling, the sun was shining and the crowd was howling, all of which set the stage for a Chicago Cubs' day at Wrigley Field.

And that's the way it turned out yesterday.

Taking advantage of Montreal's unsure defenses, the Cubs hacked out a 7-4 victory to extend their winning streak to six games and gave the first-place Expos their fifth straight defeat.

Several misplays on wind-blown fly balls proved costly to the Expos, whose National League East lead over Philadelphia and St. Louis was reduced to one game. The fourth-place Cubs moved within two games of first.

A wind-blown double by Bill Buckner helped the Cubs pull into a 3-3 tie in the fifth and a wind-blown double by Keith Moreland triggered a tie-breaking, three-run rally in the sixth.

"It shouldn't be," said Montreal Manager Bill Virdon, when asked if a visiting team is at a disadvantage at Wrigley Field when the sun is shining and the wind is blowing.

"You should be able to adjust, it should be the same for everybody," said Virdon. "We didn't adjust."

A crowd of 40,522, largest of the season, turned out. It was the biggest Cub crowd in four years.