Argentina, Paraguay, and Uruguay to Experience Heavy Rainfall

Affected by the eastward movement of an upper-level trough (Figure 1), a significant rainfall event is expected in the central and southern regions of South America from April 14 to 16. Moderate to heavy rain, with localized downpours or intense rain, will occur in northern Argentina, Paraguay, and Uruguay. In some of these areas, cumulative rainfall during this period is anticipated to be between 50 and 80 millimeters, with parts of northern Santa Fe Province and southern Chaco Province in Argentina potentially exceeding 110 millimeters (Figure 2). Additionally, some regions will experience strong winds of 4 to 6 on the Beaufort scale, with gusts exceeding 7 (Figure 3). Attention should be given to the potential secondary disasters such as flash floods and urban flooding that may result from the heavy rainfall.

Figure 1: Forecast of 500 hPa Geopotential Height (contours, units: dagpm) and 850 hPa Wind Field (wind barbs, units: m/s) at 08:00 BJT on April 15, 2026

Figure 2: Accumulated Precipitation from 08:00 on April 14, 2026, to 08:00 on April 17, 2026 (Beijing Time), in millimeters (mm)

Figure 3: Maximum Gusts in the Past 24 Hours as of 20:00 (Beijing Time) on April 16

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Author: Kong Linghan                                      Reviewer: Guan Yue 

English reviewer:Wang Yi                                                                       Issue approver:Dai Kan