A cold front that sprinkled snow on Jacksonville, Fla., moved deep into the state, frosting strawberry fields and citrus groves and taking some of the fire out of Miami's carnival fans. Temperatures dipped below freezing throughout the northern half of the state Saturday night. Tallahassee had a record low of 20, breaking the 1980 record by one degree. Tampa tied the 1980 record with 35. Spectators bundled in layers of sweaters and jackets sat shivering in the bleachers at the Grand Prix of Miami and in the Orange Bowl, where musicians and salsa dancers opened Carnival Miami.