The Central Valley and nearby mountains got up to 80 millimeters of rain (more than three inches) over just six hours Sunday.
The Instituto Meteorológico Nacional said that the instability was caused by high temperatures and a lot of humidity in the atmosphere.
The automatic weather station in Barrio Aranjuez said that the area received 40 millimeters Sunday afternoon. That’s about 1.5 inches.
The rain tapered off about 7 p.m. but the weather institute said that rivers were running out of their banks and that some bridges had collapsed.
It said that the area was vulnerable to flooding and other weather woes because the ground was soaked.