Occurrence of Anticyclonic Tornadoes in a Topographically Complex Region of Mexico

Figure 2

Time series of storm-relative helicity (SRH) of 12 tornadoes in the Trans-Mexican Volcanic Belt (TMVB) region: seven clockwise-rotating tornadoes (continuous lines marked as 1 to 7) and 5 anticlockwise-rotating tornadoes (dashed lines marked as 8 to 11) are shown. The Ciudad Acuña event (mesocyclonic tornado) is marked at the top of the graph. The shaded region illustrates the time-period when tornadoes occurred.