CHICAGO — Tornado sirens blared at Wrigley Field for most of an hour early Monday evening. Rain fell, thunder clapped, lightning flashed. It was quite a show. Then the game started. A weather delay of one hour, 25 minutes just meant the Padres waited longer to continue hardly hitting. Fortunately, waiting did nothing to stop Yu Darvish. The right-hander held his former team down for eight innings, and the Padres did eventually take their first lead in three games. Three runs in the eighth against Rowan Wick, a former Padres reliever, were the difference in a 4-1 victory. Darvish, making his fi…