A low pressure system that is creating highly unstable weather over Costa Rica is expected to influence the weather again today.
The Instituto Meteorológico Nacional predicts overnight rains in Guanacaste from 15 to 30 millimeters. That’s .6 to 1.2 inches. The same was predicted in an 8:30 p.m. special bulletin for the central and south Pacific and the Sarapiquí region. The prediction for the Central Valley was lower, some 5 to 15 millimeters, about .2 to .6 of an inch.
The weather institute said that there were storm cells in the Guanacaste mountains and also around Tiliarán.
The bulk of the rain fell Monday afternoon with Juan Santamaría airport getting 23 millimeters, about .9 of an inch. Santa Rosa in Guanacaste got 35.4 millimeters or about 1.4 inches in the afternoon.
Santa Bárbara de Heredia received 40.9 millimeters, about 1.6 inches, over a couple of hours in the afternoon.
Hacienda Pinella in Santa Cruz reported a small amount of rain Monday, but the weather institute’s automatic station there registered 56.5 millimeters or 2.2 inches from 7 a.m. Sunday until 7 a.m. Monday.
Rain in the mountains generally results in swollen rivers at lower altitudes. The weather institute issued warnings for those living near rivers and streams.
Meanwhile in the Atlantic there is a new tropical storm, Humberto. But the predicted track says it is quickly heading north northeast into the middle of the northern Atlantic.
Heavy rains are normal for this time of year with October and early November also being wet months. As Christmas approaches, the season changes into the much anticipated dry or high tourist season.