Within the cold sector north to northwest of a cyclone center , in colder cyclones , small scale , or mesoscale , bands of heavy snow can occur within a cyclone 's comma head precipitation pattern with a width of 20 miles ( 32 km ) to 50 miles ( 80 km ) .
In colder cyclones , small bands of heavy snow can occur with a width of 20 miles ( 32 km ) to 50 miles ( 80 km ) .