Flash Flood Warnings in Puerto Rico, 2024

By month

73 of 120 flash flood warnings covering Puerto Rico in 2024 had a flash flood report inside them; 190 of 343 flash flood reports fell inside a warning, on average 80 minutes after it went out.

Puerto Rico, 2024

Each office's whole area, 2024

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

1. August 14, 202416flash flood warnings
2. May 7, 202411flash flood warnings
3. October 31, 20249flash flood warnings
4. November 1, 20249flash flood warnings
5. May 8, 20248flash flood warnings
6. May 9, 20247flash flood warnings
7. May 3, 20246flash flood warnings
8. November 16, 20245flash flood warnings
9. November 10, 20244flash flood warnings
10. April 18, 20243flash flood warnings
11. April 22, 20243flash flood warnings
12. May 10, 20243flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20232025

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.