A volcanic eruption Saturday in the South Pacific island nation of Tonga was so powerful that its shock wave caused changes in air pressure detected thousands of miles away in Chicago.
between 8:20 and 8:30 a.m. Saturday as the shock wave moved east from the volcano, according to the National Weather Service.
"The eruption was so powerful that the waves actually propagated all the way around the globe and then back again," meteorologist Gino Izzi said.
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