One did not have to be a weather expert to know Monday that a heavy thunderstorm would slice through the Central Valley.
The hot humid morning was all the warning anyone would need.
The real weather experts at the Instituto Meteorológico Nacional were a little more precise in a 10:30 a.m. bulletin. The prediction was for intense rain and thunderstorms in the afternoon. But only in some places.
The prime recipients of downpours would be the south Pacific and the Central Valley, the institute said. But the Caribbean would have to watch out for rising rivers because there would be rain in the coastal mountains.
No one said anything about hail, but that also is a frequent product of tropical thunderstorms. Pearls of ice fell in San Pedro and San José as bolts of lightning sought out computers and other electronics.
The center of the metro area got the brunt of the 12:30 p.m. storm. The weather institute estimated 31 millimeters (1.2 inches) fell at the Barrio Aranjuez headquarters between 1 and 3 p.m. San Pedro was hit with flooding, and Avenida Central was deep in water in front of Mall San Pedro.
The storm also hit the San José downtown.
But automatic stations showed that there was only a hint of rain at both metro area airports, and very little fell in places like La Garita where the rain usually is more than in the downtown. Monday La Garita got just 6.4 millimeters (.25 inches).
The weather institute predicts the same scenario for today, perhaps with rain continuing into the evening. The weather institute issued a warning about lightning over the weekend.