The national emergency commission has declared a preventative alert for the Caribbean and the northern zone where rains have saturated the ground and caused some rivers to overflow.
More of the same weather is expected for today in these areas and probably for the rest of the weekend.
The Instituto Meteorológico Nacional said that the Central Valley would see some rain in the mountains and that the Pacific coast could see isolated showers by the afternoon.
The Comisión Nacional de Prevención de Riesgos y Atención de Emergencias declared the alert, which brings local emergency committees into action.
Emergency crews in Sarapiquí opened up a shelter in a local community hall where some 22 persons were expected to spend the night. In Guácimo there were 20 persons in a shelter, said the national emergency commission.
There were reports of 16 communities being cut off by flooding rivers. In Guácimo the communities were La Lucha, Escocia, Silencio, La Platina, Seis Amigos and Camaroncito. In Pococí, the communities were reported to be Cocotales, La Rita Ticabán, Milloncito, El Millón and San Jorge. The Sarapiquí communities that were cut off are Tigre, Caño Negro and Flaminia, said the commission.
The weather institute said at 7 p.m. Thursday that from 10 to 30 millimeters (about a half inch to a bit more than one inch) of rain fell in the northern zone and along the Caribbean coast in the afternoon and early evening. The Río Colorado in the north and the Rio Sixaola in the south were reported swelling.
Flooding generally is caused by rain in the mountains and not locally.
Rains of up to 70 millimeters (about 2.74 inches) were predicted for some of these areas overnight.
The big concern for many expats are the condition of the roads. Rain nearly all day in the Central Valley has certainly affected the usual trouble spots. The Consejo Nacional de Vialidad had not reported any major slides or collapses of pavement by 1 a.m. today.