Weather warnings

Jul

15

Informative Weather Advisory

Saharan Dust and Strong Wind Gusts Affecting Several Regions

July 15, 2025
9:00 am

  A dry air mass accompanied by Saharan dust is positioned over the Caribbean Sea and Central America. Additionally, a marked atmospheric pressure gradient is accelerating the trade winds...

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Jul

14

Aviso Meteorológico

Onda tropical #15 transitando este lunes por el país

14 de julio de 2025
10:00 AM

Diagnóstico: La onda tropical #15 ingresó al país durante la madrugada. Aunque es una onda débil, ha generado lluvias y tormentas en zonas marítimas del Pacífico Central, el Caribe y en áreas...

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Jul

13

Aviso Meteorológico Informativo

Tropical Wave #15 transiting over Costa Rica early Monday morning

July 13h, 2025
6 p.m.

Diagnosis: During the course of early Monday morning, tropical wave #15 will be passing over the national territory. Although it is a weak tropical wave, it will be interacting with the...

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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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Weather warnings history

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Aviso Meteorológico-IMN-091024-430pm

Oct

09

Weather Warning (Update)

Unstable conditions remain over our country this afternoon and evening

October 09, 2024
4:30 p.m.

Diagnosis: We continue with a high humidity content in the country, which is being caused by the position of the Intertropical Convergence Zone and the systems in the middle and upper atmosphere. Accumulations since 7:00 a.m. by region are in the following ranges:

• Northern Zone between 15-30 mm.
• Northern Caribbean between 5-20 mm.
• Southern Caribbean between 10-20 mm, with a maximum of 42 mm at the Turrialba Volcano.
• Northern Pacific between 10-40 mm, with a maximum of 64 mm in Hojancha.
• Central Pacific and Southern Pacific between 10-40 mm, with a maximum of 50 mm in Ciudad Neily.
• Central Valley between 15-45 mm, especially in sectors to the south.

Forecast: For the rest of the afternoon today, showers with storms are expected to continue in the Northern Zone and the western Caribbean. The estimated accumulated rainfall would be between 10 - 30 mm with maximum rainfall of 30 - 60 mm. In the case of the Pacific regions, variable rainfall with occasional storms is expected, especially in coastal areas. The accumulated rainfall would be between 10 - 30 mm with maximum rainfall of 60 mm. On the other hand, in the Central Valley, intermittent rainfall is expected with accumulated rainfall varying between 10-30 mm.

Warning: Very saturated soil conditions continue throughout the central mountainous part of the country on both sides, the Central Valley and in low areas of both peninsulas in the Pacific. In addition, a large part of the Northern Zone registers high saturation values. This situation indicates a risk of incidents due to saturation of sewers, flooding of rivers or landslides in areas where the occurrence of rainfall is estimated during this day.

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

Paulo J. Solano S.
Meteorologist
DMSA-IMN