Even as tornado watches remain in effect, meteorologists are shaking their heads at the “Superstorm” that savaged the Midwest Tuesday, spawning twisters and other damaging winds and breaking records for its hurricane-like intensity.
The middle latitudes of the Northern Hemisphere are often a meteorological battleground this time of year between the declining forces of the summer’s warmth and the resurgent cold of impending winter, just as spring often sees violent clashes of opposing seasonal patterns.
But what happened this week was different in magnitude if not in kind.
Crossing Minnesota late Monday and Tuesday, low atmospheric pressure sank to 955 millibars — the kind of intensity readings that forecasters are more accustomed to seeing in the eyes of hurricanes.
This U.S. GOES-East satellite image captures the storm lumbering eastward Wednesday. (NASA)
Meteorologist Larry Cosgrove in Houston said that unofficially “this disturbance may have sported the lowest barometric pressure in recorded history.”
Meteorologist Jeff Masters at Weather Underground said the pressure reading was “the lowest pressure ever measured anywhere in the continental United States aside from the Atlantic Coast.”
Masters observed something else:
Earlier this year, Masters wrote that modeling studies simulating an atmosphere with greater concentrations of greenhouse gases “predict a future with fewer total winter storms, but a greater number of intense storms.”
IMAGE: Red Cross workers walk away from a barn that was lifted off its foundation by a tornado Oct. 26, 2010, in Mount Pleasant, Wis. Credit: AP