Saturday night, eyes bleary, rain slapping hard on your car. You turn up your radio to hear her silky narration, the aural equivalent of hot chocolate during a snowstorm. Although Fields, who studied broadcasting and journalism in college, makes her living as an Associated Press reporter, she confesses, "Radio was always my love." Since 1995 on WLRN, her sultry jazz selections and intimate intonations have conveyed that romance, wooing listeners and providing a cozy respite from the elements. Hear her 8:00 p.m. until midnight Saturdays.