The weather service said a brief twister caused minor damage to the area as storms passed through North Texas on Thursday.Officials with the National Weather Service confirmed Thursday that a brief tornado formed near the University of North Texas’ branch campus in Frisco as
He said it was the only reported tornado in North Texas as storms passed through. Officials are unsure yet of the rating. Dunn said videos online appeared to show the twister, but personnel will go to the area Friday to survey the damage. Tornadoes are rated on the Enhanced Fujita scale — from the EF0 to EF5 — which measures wind speed and storm damage.The weather service issued a tornado warning for Frisco, Little Elm and Prosper about 6:45 p.m. A little after 7 p.m.