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...
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...
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...
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...
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...
Weather warnings history
In this section you will find the weather warnings history.
Aviso Meteorológico-IMN-070924-1035am
Sep
07
Weather Warning
Heavy rains and thunderstorms during this afternoon and early evening
September 07, 2024
10.35 a.m.
Discussion: The Intertropical Convergence Zone maintains its activity close to the national territory, which has favored a very humid and unstable atmospheric pattern, generating cloudiness especially near the coasts and occasional rains this morning in sectors of the Osa Peninsula, Tortuguero, Santa Elena Peninsula, south of the Nicoya Peninsula, Upala, among others; with accumulations between 5-34 mm in the last 3 hours.
Forecast: Strong rain and thunderstorms are expected this afternoon and early evening. The regions most likely to experience these conditions are the Central Valley, the Northern Zone and the Pacific. Rain will begin in the mountainous areas and gradually spread to the lower areas. In the Caribbean, rain is not ruled out; however, it will be limited to the mountainous areas. Amounts between 30-70 mm are expected in 6-12 hour periods, with higher localized accumulations possible.
Warning: Saturation of elevated soils will continue in the North Zone, the Southern Pacific and the Nicoya Peninsula, where rain will be recurrent, so these areas are highly vulnerable. Likewise, the rains expected in urban areas may cause congestion in the sewer system and flash floods.
Due to the above, the IMN recommends:
- Be careful 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
