1.   After the rope disappears, the parent thunderstorm may spawn another twister.

2.   After the tornado dies, the parent thunderstorm may spawn another twister.

3.   Disturbances in the jet stream ignite the volatile mixture resulting in rotating thunderstorms that can spawn twisters.

4.   In normal years, the conditions that tend to spawn twisters tend to shift northward into the Texas Panhandle and Oklahoma during the spring months.

5.   These contrasts are key to energizing the thunderstorms that spawn twisters.

6.   When the two come together, rotating thunderstorms that spawn twisters can erupt.