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 This tropical wave has a 60% chance of cyclone formation in 24 hours.  - A.M. Costa Rica wire services illustrative photo -

Published Thursday, August 20, 2020

A new tropical wave could
become a cyclone

By the A.M. Costa Rica staff

Specialists from the Meteorological Institute warn that the new tropical wave entering today, number 30 of the green season, has the potential to become a cyclone.

According to the institute, specialists are monitoring the evolution of the new tropical wave which was located on Wednesday near the Colombia Atlantic coast.

According to the U.S. National Hurricane Center (NOAA), the new tropical wave has a potential of growing to a tropical cyclone in the next hours.

The NOAA most recent report for the North Atlantic, the Caribbean Sea and the Gulf of Mexico, showers and thunderstorms have become more concentrated today in association with this incoming tropical wave, which is currently located over the central Caribbean Sea. This tropical wave has a 60% chance of cyclone formation in 24 hours.

According to the Costa Rican institute, another factor that affects the increase in rainfall is the proximity of the Intertropical Convergence Zone, which is located in the south of the country and will be approaching the national territory.

The Intertropical Convergence Zone, known by sailors as the doldrums or the calms due to the dull windless weather, is the area where the northeast and southeast trade winds converge. The zone appears as a band of clouds, usually, thunderstorms, that circles the globe near the Equator.

This phenomenon will cause rains from early in the afternoon and until late at night in the Pacific Coast (Puntarenas and Guanacaste Provinces) and Central Valley (San José Province).

Today's forecast of thunderstorm showers are expected along the Pacific Coast. The highest amounts of rainfall will be concentrated in the South Pacific Coast, with estimated amounts between 50-80mm and maximums of 90-110 mm. In the Central Pacific Coast amounts between 30-60mm and maximums of 70-80mm are expected. In the North Pacific Coast rains are expected with amounts 20-40mm and maximums of 50mm.

In the Central Valley, showers are expected with estimated amounts between 20-30mm and maximums of 40mm. In the North Zone and the Caribbean, the rains are expected in less volume that will not exceed 20mm.

Specialists from the National Emergency Commission recommend that in order to avoid accidents, damage to structures and emergencies during the green season where there is a strong increase in rainfall throughout the country, make sure to:

• Keep the roof of your house clean.

• Clear a path in the backyard allowing rainwater to move without problems towards the drainage, which helps to avoid damages and leaks in the house.

• Pick up the garbage so that it does not fall on the pipes or drains on the sidewalks.

• Avoid that solvents, oils, acids or corrosive liquids that can fall into the sewer pipes and deteriorate them.

• Organize the cleaning of public areas such as river banks in your community to avoid flooding.

• Report the lack of concrete caps or grids in the pipes to the Aqueduct Institute by calling 2547-6555.

Authorities call on the public to take the following precautionary measures:

• Stay informed about the alerts issued by the authorities.

• People living in mountain areas should increase precautionary measures against a possible landslide or material falling from the high areas of the hills.

• Have an emergency evacuation plan in the community, work and home.

• Drivers must increase precautions for heavy rain and fog.

• Take precautionary measures in case of electrical storms.

• Be alert in vulnerable areas to flooding due to sewer saturation or increase of river flow.

• In case of a thunderstorm, take refuge in a safe place.

• In case of strong wind gusts, be alert to possible falling tree branches or electrical cables.

• In the event of a landslide, do not walk on the debris, stay away from affected areas, and do not return home until authorities verify that it is a safe place.

Authorities ask for the people in Costa Rica to call 911 to report any possible flooding, fallen trees or landslides.

A.M. Costa Rica urges readers to share this alert with their contacts.

What emergencies have you heard of due to the thunderstorms in your community? We would like to know your thoughts on this story. Send your comments to


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