Mid- to upper-level short wave troughs, a jet streak near the region and above normal moisture being steered from the Caribbean resulted in moist and unstable conditions. Available moisture, diurnal heating, local sea breeze convergence, and orographic |effects all also aided in afternoon showers and t-storms.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SJU wrote it up.
Mid- to upper-level short wave troughs, a jet streak near the region and above normal moisture being steered from the Caribbean resulted in moist and unstable conditions. Available moisture, diurnal heating, local sea breeze convergence, and orographic |effects all also aided in afternoon showers and t-storms. These resulted in Rio Blanco and Rio Grande rising out of their banks and resulting in River Flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Juan, PR wrote its last area forecast discussion before the first event at Apr 6, 3:10 AM AST, 4 hours 30 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 flood. Local standard time, as filed.
PR-31 near PR-53 exit 22 impassable due to Rio Blanco out of its banks. The USGS sensor reported 7.91 feet at 7:30 AM AST.
Naguabo Emergency Manager reported that Rio Blanco is out of its banks. The Intersection of PR-191 and PR-31, near the highway exit, was closed due to impassibility.
Emergency managers reported flooding affecting PR-956 and PR-186 in Sector Galateo Barrio Bartolo due to the Rio Grande overflowing its banks. The roads are impassable, and local officials have proceeded to close them to the public.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2026Every state in 2026This day in weather historyWarnings in Puerto Rico, April 2026
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1331259, 1331261, 1331264.