Weather warnings

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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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...

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Jun

27

Weather Warning -Update-

Rainy Afternoon in Costa Rica

June 27th, 2025
05.40 p.m.

Forecast: After the passage of Tropical Wave 9 yesterday, Thursday, the atmosphere remains unstable over the country. Along with warm morning temperatures and high humidity from recent rains,...

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Jun

27

Weather Warning

Tarde lluviosa en Costa Rica

June 27th, 2025
10:00 am

Diagnosis: After the passage of tropical wave #9 on Thursday, the atmosphere continues to be unstable over the country, which, together with the warm temperatures of this morning and the high...

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Jun

26

Weather Warning | Update

Rainfall activity of varying intensity this afternoon in the Pacific and Northern Zone

June 26, 2025
5:00 p.m.

Diagnostic: The passage of Tropical Wave #9, in combination with the Intertropical Convergence Zone, maintains atmospheric instability over the country. This has generated rain showers and...

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Weather warnings history

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Aviso Meteorológico-IMN-281124-0640pm

Nov

28

Weather Warning (Update)

Variable rains this afternoon and early evening

November 28, 2024
06.40 p.m.

Discussion: The entry of humidity from maritime sectors of the Caribbean and the Pacific, in addition to daytime warming and the active Intertropical Convergence Zone (ITCZ) in the south of the country; have favored a rainy scenario throughout the day, with intense rain events particularly this afternoon, especially in the Central Valley and Central-South Pacific. Precipitation ranges between 15-50 mm in a 6-hour period; with punctual maximums of up to 94 mm in Barva de Heredia, 62 mm in Quepos and 59 mm in Montecarlo de Pérez Zeledón.

Forecast: The latest analyses indicate a gradual decrease in the intensity of rainfall; however, during the first part of the night, light to moderate rains will continue in the Central Valley, the Central and South Pacific, as well as in the mountains of the Caribbean; there is also the possibility of rain in the Nicoya Peninsula, with an estimated accumulation of 10-30 mm, with possible maximums at certain times.

The proximity of the ITCZ to the south of Central America will favor rain in sectors of the South Pacific, especially on the coast during the night and towards the early hours of Friday. There is a probability of rain in these periods in the Caribbean and the Northern Zone. Estimated amounts are 20-50 mm in periods of 6-12 hours.

Warning: Pay special attention to mountainous sectors of the Caribbean, Northern Zone and South Pacific because the basins have saturation levels between 85% and 95%. Therefore, they are vulnerable to the occurrence of floods and landslides.

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