Synoptic-Scale Precursors to Tropical Cyclone Rapid Intensification in the Atlantic Basin

Figure 6

Pressure vertical velocity (Pa s⁻¹) cluster 3 RI composite cross section 1000–100 hPa (panel (a)) and cluster 5 non-RI composite (panel (b)) and the resulting differences in the permutation test of the fields for 1000–100 hPa (panel (c): shaded areas are significant at or less). The value field reveals specific locations where differences are strongest and emphasizes the differences in the vertically stacked RI composite and the tilted non-RI composite.

(a)

(b)

(c)