Calm Conditions with Little Wind Thursday Morning May Have Exacerbated Ammonia Leak Effects in Beach Park

Beach Park officials notified anyone living within a one-mile radius of the spill to stay indoors, keep their doors and windows closed, and turn off any air conditioning or ventilation systems. That shelter-in-place order was lifted at about 10 a.m. Thursday.

Professor Thomas O’Halloran, Northwestern University Chemistry of Life Processes Institute explained today that concentrated ammonia was not dispersed by the wind. O’Halloran said the cloud had nothing to blow it around or dilute it, and so it moved in a fairly concentrated state.

Wind at 4:55 a.m. CDT Thursday April 25, 2019 was CALM at Waukegan Regional Airport, located just south of the scene. According to the NWS office at Waukegan Regional Airport, wind was forecast to hold at 2 mph from the southwest until about 9:00 a.m. when wind was forecast to shift from the southeast. Wind was also forecast to shift from the east and increase to about 9 MPH with gusts to 14-15 MPH by noon.

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