Depends on which you are referring to. There were several events
known as the "Palm Sunday Tornado Outbreak" in 1920, 1965, and
1994. There was no warning during the 1920 event, as no warning
system existed at the time. During the 1965 event, warnings were
issued, but due to communication problems, few people received them
as the warning system was not fully developed. Warnings were issued
in the 1994 event, as by then the modern warning system was largely
in place.