Weather warnings
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...
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...
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...
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...
Jun
28
Weather Warning
Tropical Wave #10 over Costa Rica
June 28th, 2025
10:30 a.m.
Diagnosis: Tropical wave #10 is over the country this Saturday, causing instability in maritime areas of the Caribbean and northern parts of the Northern Zone. There has been increasing...
Weather warnings history
In this section you will find the weather warnings history.
Weather Warning
Aug
02
Showers with thunderstorms in the North Pacific
August 2, 2024
08:00 p.m.
Diagnosis: The entry of humidity from maritime sectors, together with the positioning of the Intertropical Convergence Zone close to the country, have favored during the afternoon and what we have of the night period of this Friday showers with thunderstorms in the North Pacific and sectors west of the Central Valley. The main accumulations of the last 6 hours are the following: Dulce Nombre in Nicoya with 76.8 mm, Cañas in Guanacaste with 66.6 mm, Santa Rita in Nandayure with 63.8 mm, Montaña Sagrada (Aguas Zarcas Landslide) with 42.4 mm, Tenorio Volcano with 38.4 mm, Balsa in San Ramón with 33.4 mm, Naranjo with 100.2 mm, Las Esferas in Osa with 21 mm, Montecarlo in Pérez Zeledón with 16.4 mm and Arunachala, Rio Nuevo in Pérez Zeledón with 16.2 mm.
Forecast: During the next 1-3 hours, showers with thunderstorms will continue in the North and Central Pacific, as well as some sectors west of the North Zone, with estimated amounts of 20-50 mm. This rainy activity would tend to decrease during the second half of the night period. During the early morning period, occasional rains could occur in the Caribbean and the Northern Zone, with estimated amounts of 10-20 mm.
This Saturday, the passage of tropical wave #22 is expected, although the cloudiness and instability associated with this system moves over the Greater Antilles, the effects of this extensive disturbance may cause an ideal environment for precipitation in the national territory; during the morning in the Caribbean and the Northern Zone, in the afternoon in regions of the Pacific and Central Valley.
Warning: High soil saturation remains in the Northern Zone, the Caribbean, South Pacific and the Nicoya Peninsula, increasing vulnerability in these sectors. In addition, in urban areas, sewer saturation could cause flash floods.
Due to the above, the IMN recommends:
- Caution due to sewer saturation in places prone to this type of flooding.
- Prevention against thunderstorms and seek shelter in a safe place if strong gusts of wind occur or are perceived 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.
Andrés Gamboa
Meteorologist
DMSA-IMN
