Weather Warning

Rainy conditions this afternoon and evening

May 15, 2025

10.45 a.m.

Discussion: The Intertropical Convergence Zone near Costa Rica and instability in the upper atmosphere, along with morning warming, are contributing factors to the presence of cloudiness and precipitation today.

Forecast: Rain of varying intensity is expected for this afternoon and during the first part of the night, as well as isolated showers with thunderstorms.

The heaviest and most widespread rainfall and thunderstorms will occur in the Central and South Pacific, the Nicoya Peninsula, and the Tempisque Valley, gradually spreading toward northern Guanacaste. Accumulations of between 40 mm and 100 mm are estimated over six-hour periods; higher accumulations are possible locally.

Meanwhile, isolated rain and downpours with thunderstorms are expected in the Central Valley, the North Zone, and the Caribbean Mountains; amounts of between 30 and 60 mm are expected over six-hour periods.

Warning: The rains of recent days have caused soil saturation to high levels, between 85% and 95%, in the South Pacific, Central Pacific, the Sarapiquí Basin, and the Nicoya Peninsula; while in the Central Valley, around 65%. This situation increases the risk of flash flooding and/or landslides.

Due to the above, the IMN recommends:

• Be cautious about sewer saturation in areas prone to this type of flooding.
• Prepare for thunderstorms and seek shelter in a safe place if strong wind gusts occur or are perceived near storm clouds, due to the possible fall of tree branches, power lines, among other things. These gusts can reach 80 km/h in some isolated cases.
• Stay informed through social media: Twitter: @IMNCR, Facebook: Instituto Meteorológico Nacional CR, and the website: www.imn.ac.cr

Rebeca Morera R.
Meteorologist
DMSA-IMN