Increased Rainfall Due to a New Tropical Wave: Weather Event and Forecast

A new tropical wave (No. 2) is moving across the Caribbean Sea and, according to the National Meteorological Institute (IMN), could reach Costa Rica starting Saturday afternoon, May 16, intensifying rainfall activity in several regions of the country. This phenomenon occurs as Costa Rica transitions into the rainy season, with a wetter pattern forecast between May 11 and 17.

Meteorologists have indicated that, although the wave is currently weak and under observation, it may combine with local humidity factors and the Intertropical Convergence Zone (ITCZ) to increase precipitation across different parts of the national territory. The IMN continues to monitor its evolution to determine whether it strengthens before arrival.

Rainy Season Context

Costa Rica is currently in a transitional period toward the rainy season, and several regions are already entering the typical onset dates of this season, according to IMN projections. During this stage, trade winds and moisture from the Caribbean Sea increase the likelihood of showers and thunderstorms at various times of the day, which are characteristic of this annual climatic phase.

Official Recommendations

In light of the potential increase in rainfall, authorities recommend:

• Checking updated forecasts directly from the IMN and the National Emergency Commission (CNE).
• Taking extra precautions in areas vulnerable to flooding and soil saturation.
• Keeping drainage systems and stormwater channels clear to prevent urban flooding.

Continuous monitoring of official forecasts and alerts allows the population to prepare adequately for possible weather events associated with tropical waves and the onset of the rainy season.

Official Sources

• National Meteorological Institute (IMN) — Official monitoring and forecasts regarding tropical waves, the start of the rainy season, and atmospheric conditions in Costa Rica.

• National Commission for Risk Prevention and Emergency Response (CNE) — Preventive recommendations for heavy rains, flooding, and soil saturation.

• Intertropical Convergence Zone (IMN explanation) — Technical information on the atmospheric phenomenon influencing increased rainfall in the region.

• CRHoy — News report based on IMN information regarding the tropical wave.