Remember Tropical Storm Erin in Oklahoma?
They actually just came out with a report only a few months ago on the weather phenomena that Erin was. Because it reformed so significantly, questions were raised as to whether or not it really was an over-land Tropical Storm or even level 1 Hurricane (because the winds were the equivalent of that).
Interestingly, after nearly a year of debate and research, the conclusion is that what hit Oklahoma a year ago was simply a "low".
Looks like a hurricane or tropical storm to me!
More info:
Tropical Storm Erin - A Hurricane Over Oklahoma ? - thedailygreen.com