Fig. 4: Trends in the frequency of synoptic patterns and associated tornado reports. | npj Climate and Atmospheric Science

Fig. 4: Trends in the frequency of synoptic patterns and associated tornado reports.

From: Classifying synoptic patterns driving tornadic storms and associated spatial trends in the United States

Fig. 4

Interannual changes of a the annual counts of tornado-occurring 3-hourly synoptic weather maps (solid lines) and b the number of tornadoes per 3-hour window (solid lines; calculated by dividing the annual number of tornadoes by the annual number of tornado-occurring weather maps) for each cluster, respectively. The dashed lines indicate the linear regression predictor for each series. The trend values denote the slope of the linear regression using the Theil-Sen estimator. The p values are achieved using Kendall’s τ statistics, and a value ≤0.05 indicates a statistically significant trend that differs from 0 (no change).

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