That day started off with no threat of severe weather, then by mid morning changed to slight risk..few hours later moderate risk and then right before storms blew up a high risk.
People were caught off guard and took shelter under overpasses, including storm chaser Reed timmer.
That tornado and the 60+ others was the worst natural disaster event in Oklahoma history, but that okc storm is still regarded as a historic storm.
They feared hundreds would die as it entered the metro but amazingly only 46 people were killed. ( sad that anyone died, really)