What causes Texas and Oklahoma to have a strange rainfall pattern?

[Pincho-toot]

It's location between the far west and east, and south of the Midwestern plains. Stormy springs are not just in Texas, they're in the Midwest. Kansas and Texas have similar spring weather, with increased chance of tornadoes.

[Warszawa]

I'm guessing that the humid moist air from the Gulf of Mexico meets the freezing Canadian air during this time, creating storms in the areas to the noerh of the Gulf