![]() As storms began to form on the evening of December 26th, they quickly became surface based and rotated like spinning tops on a table.Ĭhris Robbins, the owner of iWeatherNet, and I covered this event live on the company Facebook page as the situation unfolded across North Texas. Deep, rich moisture coupled with the low-level wind shear in place is some of the necessary conditions that favor rotating thunderstorms, otherwise known as supercells. Notice on the sounding that there is strong low-level wind shear in place (barbs with the “flag” represent winds of 50 knots, or ~58mph). Sounding retrieved via the NOAA Storm Prediction Center The afternoon observed sounding analysis out of the DFW metroplex on December 26th, 2015. This can be observed on the afternoon sounding analysis from the radiosonde that was launched from the National Weather Service office in Dallas/Fort Worth on December 26th at 1:00pm CST. With strong upper air dynamics, in addition to sufficient thermal instability, or CAPE, it resulted in an environment favorable for rotating thunderstorms. Of which, deep moist tropical air was advected northward into northern Texas. In association with the upper-level support, cyclogenesis (formation) of a surface low occurred in northern Texas. Prior to this event unfolding, a powerful upper-level jet streak pivoted off of the desert southwest U.S., and ejected into the southern Great Plains. Infrared (IR) satellite imagery over the southern Plains on December 26th, 2015. Visible satellite imagery over the southern Plains on December 26th, 2015. ![]() Below is the visible satellite and infrared imagery, respectively, that shows the evolution of the tornadic supercells across northern Texas on December 26th, 2015. There were a total of 12 confirmed tornadoes, including one violent tornado that was rated an EF-4 with estimated winds to 180mph that devastated the communities of Garland and Rowlett as it crossed Interstate 30. The day after Christmas Day in 2015, an outbreak of tornadoes across the Dallas/Fort Worth metroplex and northern Texas.
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