Tom Karl was born in Chicago, Illinois in 1951 and grew up in the suburbs, observing and predicting the weather using homemade instruments with his father.  He attended Northern Illinois University and graduated in 1973 with a major in meteorology and a minor in mathematics.  He attended graduate school at the University of Wisconsin and studied under Werner Schwerdtfeger.  After a brief TV/Radio weather forecasting position at the beginning of his career Tom joined the National Oceanic and Atmospheric Administration (NOAA) in 1975.