Weather warnings

Jul

11

Weather Warning

Tropical wave #14 over Costa Rica this Friday

July 11th, 2025
9:50 a.m.

Diagnosis: The high humidity level across the country and the current instability are a result of Tropical Wave 14, which is positioned over the country this morning. Scattered showers have...

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Jul

10

Weather Warning

Tropical Wave 14 to Pass Over Costa Rica This Friday

July 10, 2025
04.30 p.m.

Discussion: A change in the weather pattern toward more humid and unstable atmospheric conditions over Costa Rica and surrounding areas will increase the occurrence of rainfall in various parts...

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Jul

08

Informative Weather Notice

Sahara dust over the country

July 08th, 2025
9:50 a.m.

Diagnosis: Increases in atmospheric pressure in the Caribbean Sea accelerate the trade winds over the basin, as well as over central and northern Spain. Furthermore, a dry, stable air mass...

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Jul

07

Weather Warning

Heavy downpours during the afternoon in the Pacific and northern regions

July 07th, 2025
10.40 a.m.

Discussion: Tropical Wave 13 is located in western Costa Rica, close to entering the Pacific Ocean. Although it is a weak wave, its interaction with the Intertropical Convergence Zone increases...

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Jul

06

Aviso Meteorológico

Efectos de la onda tropical #13 en el país este domingo y lunes

06 de julio de 2025
11.25 am

Diagnóstico: La onda tropical #13 se localiza este domingo al oeste de Panamá, generando inestabilidad en el mar Caribe frente a la costa costarricense, lo que favorece lluvias en el Caribe Sur...

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Weather warnings history

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Aviso Meteorológico-IMN-070924-0450pm

Sep

07

Weather Warning (Update)

Heavy rains and thunderstorms during this afternoon and early evening

September 07, 2024
4.50 p.m.

Discussion: The Intertropical Convergence Zone maintains its activity close to the national territory, which has favored a very humid and unstable atmospheric pattern. During this afternoon, heavy rains have been recorded in different regions of the country, particularly in the Central Valley, Northern Zone, Central Pacific and mountains of the Caribbean, generating accumulations so far of 90 mm in Pavas, 65 mm in Cartago, 75 mm in Santa Bárbara de Heredia, 70 mm in Quepos, 80 mm in Cutris de San Carlos, 65 mm in Upala, 105 mm in Alajuela, 114 mm in Pococí, among others.

Forecast: Heavy rain will continue to occur during the rest of the afternoon and early part of the night, accompanied by isolated thunderstorms in the Central Valley, Northern Zone, and Caribbean mountains. This rain will progressively spread towards the North Pacific. Accumulations are estimated between 30-70 mm, in periods of 6-12 hours, with possible higher accumulations in a localized manner.

Moderate showers are expected in the Central and South Pacific, amounts between 30-60 mm in periods of 6-12 hours.

In the second part of the night, rainfall will gradually decrease in much of the country. Rain is not ruled out on the Pacific coasts.

Warning: Saturation of elevated soils continues in the Northern Zone, South Pacific and Nicoya Peninsula, where rains will be recurrent, so these areas are highly vulnerable. Also, the rains expected in urban areas can cause congestion in the sewer system and flash floods.

Due to the above, the IMN recommends:

  • Caution due to sewer saturation in places prone to this type of flooding.
  • Prevention against electrical storms and seek shelter in a safe place in case of strong gusts of wind near storm clouds, due to the possible fall of tree branches, power lines, among others. These gusts can reach 80 km/h in some isolated cases.
  • Stay informed through social networks, Twitter: @IMNCR, Facebook: Instituto Meteorológico Nacional CR and the WEB Page: www.imn.ac.cr

Rebeca Morera R
Meteorologist
DMSA-IMN