It was only after it settled down that we realised what we had achieved. In a 24 hour period our emergency department would typically see around 200 patients. During “Thunderstorm Asthma,” over a 12-hour period between 7pm and 7 am we treated 296 patients; 208 of them had respiratory symptoms. Of these patients 170 went home, 36 were admitted including four that went to the intensive care unit. The peak occurred at 9pm, when 43 patients arrived in an hour. It wasn’t until 2am before our numbers dropped below 20 an hour.