0.103 meter is the same as 10.3 centimeters which is equal to 103 milimeters, so he could say for exapmple: "The snowfall amount is one hundred and three milimeters at the moment".
The weather reporter can explain the snowfall of 0.103 meters as ten point three centimeters or one hundred and three millimeters. This conversion makes it easier for the audience to understand the amount of snowfall. Stating both measurements provides clarity and context for listeners.
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