SUPERCELL
Precipitation
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In the result of the WRF model simulations, a noticeable difference in mixing ratios based on the initial radius. Consequently, an analysis was conducted on the mixing ratios through QCLOUD and QRAIN, along with an examination of precipitation amounts to understand the corresponding precipitation patterns.
01
QCLOUD & QRAIN (Time series)
The above graph shows the horizontal mean values of QCLOUD(Cloud water mixing ratio) and QRAIN according to the initial radius setting value as a time series. The x-axis is time step, and the y-axis is bottom top level.
Through the qcloud graph, you can check the peak point of qcloud between 1 and 2 hours, and at the peak point, you can see the difference in mixing ratio depending on the initial radius setting value. The larger the initial radius, the larger the mixing ratio value.
Similarly, for qrain, the larger the initial radius setting, the more red it appears, which means that the probability of precipitation is high.
02
Precipitation = RAINC+RAINNC
The above plot expresses the cumulative precipitation over time, which can be expressed as the sum of rainc and rainnc, by initial radius setting value. The red plot is the largest initial radius, 30km, and the green plot is the smallest initial radius, 5km.
Time step It can be seen that precipitation begins at about 40 minutes and lasts for about 2 hours. There seems to be no significant difference in precipitation duration depending on the initial radius setting value. However, if you look at the accumulated precipitation, you can see that the larger the initial radius value, the larger the accumulated precipitation.
03
RAINNC distribution (XY Plane)
The graph above is a plot showing the RAINNC variable for each initial radius horizontally, and the diagram on the left is an idealized supercell radar reflection.
Radar reflectivity means the area of descent and precipitation, so the red area with high reflectivity can be called the heavy rain part, and the blue area with low reflectivity can be called the light rain part. If you look at the RAINNC value of the WRF modeling output, you can see that the precipitation area appears as the mesocyclone has moved, as shown in the diagram, and that the distribution accurately shows heavy rain and light rain. Additionally, the larger the initial radius, the larger the heavy rain area becomes.
Conclusion