Weather warnings

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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Jul

01

Weather Warning

Rainy conditions in the Caribbean and Northern Zone this Tuesday and Tropical Wave #12

Jul 01th, 2025
10 am

Diagnosis The strengthening of the trade winds over the central and northern regions of the country has produced wind gusts of up to 50 km/h in areas such as Alajuela this morning. This...

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Weather warnings history

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Wather Warning-IMN-070924

Sep

06

Weather Warning

Unstable conditions prevail in the country this Friday

September 6, 2024
10:00 a.m.

Diagnosis: The active Intertropical Convergence Zone, together with the instability left to the south by the passage of tropical wave #29 over the country, have been causing rain and downpours since Friday morning in maritime areas near the Caribbean coast and both Pacific peninsulas of Costa Rica. Accumulations over the last 6 hours are below 27 mm (Costa Rican Caribbean).

Forecast: During the morning, moisture contributions from the Pacific will increase cloud cover with possible localized rain.

In the afternoon, cloud developments in the lower and central parts of the Northern Zone, over the mountainous sectors of the central and southern Pacific, as well as sectors of the north, east and south of the Central Valley, will present scattered showers accompanied by thunderstorms. Accumulations will be between 25 - 50 mm with maximums between 70 - 90 mm (the latter especially for late afternoon and night hours for the east of the North Zone and low areas of the South Pacific).

In the mountains of the Caribbean and surrounding low areas, there will likely be very localized showers with thunderstorms with amounts between 10 - 30 mm with maximums of 50 mm.

In the North Pacific, there will be showers over the Peninsula and occasional showers towards the center and mountains of the east, with estimated amounts between 20 - 40 mm with maximums of 70 mm.

Warning: The soils remain saturated in the mountains and low areas of the North Zone, areas of the South Pacific and the Nicoya Peninsula, areas where rain will be recurrent. In addition, the rains projected in urban areas can cause sewer saturation and flash flooding.

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

Jose Valverde Mora

Meteorólogo

DMSA-IMN