SUPERCELL
DATA & METHOD
The most distinctive feature of the simulation of the Idealized Supercell case
with the WRF model was categorized as an analysis point.
We analyzed the Intensity, Precipitation, and Splitting Supercell.
DATA(variables)
1. Intensity
In order to analyze the intensity of the supercell, the strength of the updraft (mesocyclone) and downdraft was confirmed through the vertical velocity (W). In addition, a vertical wind shear that directly affects the duration and strength of the storm was identified. The stronger the vertical wind shear, the stronger the dynamic process of the supercell. It was assumed that the wind shear is applied as the standard deviation of the vertical altitude of the wind vector calculated by u, v component.
2. Precipitation
The horizontal and vertical distributions of QCLOUD and QRAIN were analyzed to confirm the precipitation pattern of the supercell. QCLOUD means the cloud mixing ratio, and QRAIN means the liquid water mixing ratio, and the distribution of the mixing ratio and the precipitation pattern were confirmed. Precipitation is expressed as the sum of RAINC and RAINNC and means cumulative precipitation over time.
3. Splitting supercell
W, Vorticity, QCLOUD, and QRAIN were used to determine the splitting mechanism of the supercell. The timing of splitting and the strength and persistence after splitting were analyzed through the vertical velocity (W) and vorticity. In addition, the distribution of mixing ratio after splitting was confirmed through the vertical distribution of QCLOUD and QRAIN.
METHOD
The model was simulated over a total of 6 hours with a time step of 10 minutes, starting at 18-00-00 00:00:00 and ending at 18-00-00 06:00:00. The grid size was set to 50x50. Using the specified initial bubble size (xyrad 10000, zrad 1500) as a reference, the impact of various initial bubble sizes, including larger and smaller sizes, was examined. The xyrad was varied from 5000 to 30000 in increments of 5000, while zrad was adjusted according to the initial configuration ratio.
This experimental setup allowed for an investigation into the effects of different initial bubble sizes, providing insights into how variations in xyrad and zrad influenced the modeling results.
Limitation
After the storm is divided, the extinction phase occurs outside the grid area,
so in this project, it can only be observed in the process of dividing the storm.