Why was there no warning before devastating Tulsa tornado?

There are new questions about why there was no warning before a tornado ripped through Tulsa, Oklahoma, early Sunday morning. The National Weather Service confirmed an EF2 tornado touched down. The rare August tornado ripped roofs off homes and knocked down trees. About 30 people were hurt, and two people had severe injuries.As early as 1:19 a.m., the tornado touched down in Tulsa and there were signs of it on radar. But the sirens never went off because the National Weather Service did not issu