Related Clues:

• Plodding
• Dense
• It may precede a storm
• Halcyon
• Reduce the speed of
• Pre-storm status
• Storm preceder, it's said
• Brake
• Not too busy
• Like a sloth
• Largo
• Like Loesser's boat to China
• Storm preceder, supposedly
• Dawdling
• Serenity found in 17-, 26-, 42- and 54-Across