The following links will give your great tornado information as well as other weather events. The second link was kind of confusing at first to me for getting the information I needed but once I got the "hang of it", I found it to really be great.
NCDC Storm Events-Select State
Fly Tornado Paths Using Google Earth
By the way, I looked up the two counties on the NCDC site where Dalhart sits (Dallam and Hartley) and in 57 years, both of them had stats of only 27 tornadoes all an F2 or smaller. The DFW metroplex area is way greater than that, especially Tarrant and Dallas. I would have thought the Dalhart area would have been much worse.
Here is a link about wedge tornadoes. It's a shape. Looking at those photos makes me wish Spring was already in the past and never to return. I hate them.
TORNADOES: Images of 32 different shapes, sizes and colors