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Monday morning started off with a bang for residents of the Central Valley when a loud, as yet unidentified, series of booms rattled windows about 30 minutes after midnight. Many did not hear it, but enough people did to cause a firestorm of comment on social media such as Facebook and Twitter.
The strange sound was prolonged - many described it as lasting for five minutes or so. Perhaps the only one making no comments were scientists and government authorities, who were reticent about commenting or speculating. A few things it wasn't: Volcanologists discounted a volcanic eruption; nor was it a supersonic aircraft, because the powerful radar at Juan Santamaría International Airport outside of San José picked up no planes at the time, not even subsonic ones.
Also, there were no climatological phenomena or strange weather conditions. By nightfall Monday, the speculation was still going along briskly with the major vote going to fireworks at the festival at Zapote, in San José. But many said it sounded like no fireworks they had ever heard. Mario Sánchez, spokesman for the National Meteorological Institute, discounted a storm because the only thing that would sound like the noise described would be a storm accompanied by lightning - and early Monday morning was clear with a full moon.
