Snowfall on Tap For the Mid-Atlantic & New England This Weekend.
By Chris Martz | November 4, 2019 One of the first things I do while weather forecasting is study the 500 millibar height anomaly maps over the Northern Hemisphere, North America, or both. The average air pressure at sea level is 1,000 millibars and decreases by half to 500 millibars around 18,000 feet in the atmosphere. 18,000 feet is the
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