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WEATHER BLOG

The Baltimore Sun

Mitchell Thompson of Easton needs help with a new digital barometer. "Readings have ranged from 998 to 1016 MBR," he says. "I am accustomed to readings such as 29.1 to 30.8." Welcome to the metric system. Your old readings were in "inches of mercury." Your new instrument displays millibars. One millibar equals 100 newtons per square meter. Huh? Standard pressure at sea level is 1,013 mb. Hurricane Katrina's pressure sank to 902 mb. For a conversion table: pcwp.com/mb_conversion.html.

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