Weather alerts in Puerto Rico, 2024
1,347 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
- Alerts
- 1,347
- Warnings
- 296
- Watches
- 23
- Advisories
- 829
- Busiest month
- May234 alerts
- Busiest day
- May 7, 202440 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Puerto Rico, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 32 | 0% | |
| Flash flood warnings | 120 | 73 | 39% | 343 | 55% | 80 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: severe thunderstorm warnings | 2 | 0 | 100% | 32 | 0% | |
| NWS JSJ: flash flood warnings | 132 | 76 | 42% | 347 | 56% | 83 min |
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.
The alerts
1,347 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 2 |
| Special Weather Statement | 150 |
| Flooding | |
| Areal Flood Warning | 57 |
| Flash Flood Warning | 120 |
| River Flood Warning | 1 |
| Flood Watch | 5 |
| Areal Flood Advisory | 617 |
| Heat | |
| Excessive Heat Warning | 45 |
| Excessive Heat Watch | 16 |
| Heat Advisory | 140 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Hurricane Watch | 1 |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Advisory | 6 |
| High Surf Advisory | 22 |
| Rip Current Statement | 49 |
| Marine | |
| Special Marine Warning | 70 |
| Small Craft Advisory | 44 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
Sources
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.