Flash Flood Warnings in Puerto Rico, 2023

By month

35 of 65 flash flood warnings covering Puerto Rico in 2023 had a flash flood report inside them; 101 of 164 flash flood reports fell inside a warning, on average 79 minutes after it went out.

Puerto Rico, 2023

Each office's whole area, 2023

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. April 23, 20238flash flood warnings
2. October 27, 20236flash flood warnings
3. April 8, 20235flash flood warnings
4. August 26, 20234flash flood warnings
5. April 28, 20233flash flood warnings
6. May 22, 20233flash flood warnings
7. October 25, 20233flash flood warnings
8. November 8, 20233flash flood warnings
9. November 9, 20233flash flood warnings
10. June 29, 20232flash flood warnings
11. July 8, 20232flash flood warnings
12. July 9, 20232flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20222024

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.