A comparison of how the old and upgraded U.S. global weather forecast models predicted the “Bomb Cyclone” that hit the northeast U.S. in January 2018. The old NOAA model (left) estimated a smaller amount of snowfall than what actually happened (right). The updated model (middle) was more accurate.

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A comparison of how the old and upgraded U.S. global weather forecast models predicted the “Bomb Cyclone” that hit the northeast U.S. in January 2018. The old NOAA model (left) estimated a smaller amount of snowfall than what actually happened (right). The updated model (middle) was more accurate.