Possible Clues:

• Increase in support gives good basic training
• Upsurge (of an opinion) among many people
• Stadium fine — that's the growing feeling
• Sudden increase of support*
• Golf games easily giving surge of emotion
• Stadium’s healthy upsurge in crowd feeling
• A big increase in a particular view among a population
• Water supply needed by land near building -- large increase
• An obvious change in public opinion
• Heavy sea caused by an earthquake, perhaps