It is found that the cold pool intensity and low-level storm dynamics are most sensitive to rain and hail intercept parameters, with little sensitivity to snow intercept parameter or hail density. Using DSD parameters that favor small hydrometeors, particularly small raindrops, leads to storms with a more intense cold pool, due to mainly the enhanced evaporative cooling over a larger area. Using DSD parameters favoring larger hydrometeors produce relatively weaker cold pools. Two 100 m simulations produced long-lived low-level tornadic circulations, with maximum intensity of F2 and a duration of about 4 minutes for the control (default) microphysical settings and a duration of 10 minutes for a case of reduced rain intercept parameter. In the cases with strong cold pools, the storm updraft is tilted rearward above the surface gust front, which is located several kilometers ahead of the main mid-level updraft. Cases with weaker cold pools usually feature strong, sustained, vertical updrafts that are located more directly over the gust front a scenario that is found to be more favorable for tornadogenesis.
Additional diagnostic analysis of the simulated tornado will be also be presented.