Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2017
135 weather alerts in 2017, 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
- 135
- Warnings
- 21
- Watches
- 8
- Advisories
- 69
- Busiest month
- September38 alerts
- Busiest day
- September 6, 20177 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
U.S. Virgin Islands, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 14 | 2 | 86% | 2 | 100% | 12 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: tornado warnings | 0 | 1 | 0% | |||
| NWS JSJ: severe thunderstorm warnings | 1 | 0 | 100% | 7 | 0% | |
| NWS JSJ: flash flood warnings | 180 | 25 | 86% | 70 | 54% | 57 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
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 1:47 AM CST | Rip Current Statement | JSJ | 57 hr | |
| Jan 7, 2:35 AM CST | Rip Current Statement | JSJ | 15 hr | |
| Jan 7, 6:09 PM CST | Rip Current Statement | JSJ | 11 days | |
| Jan 9, 9:45 AM CST | High Surf Advisory | JSJ | 6 days | |
| Jan 10, 2:22 AM CST | Coastal Flood Advisory | JSJ | 5 days | |
| Jan 12, 4:03 AM CST | High Surf Advisory | JSJ | 4 days | |
| Jan 12, 11:13 AM CST | Coastal Flood Advisory | JSJ | 65 hr | |
| Jan 25, 10:47 AM CST | Rip Current Statement | JSJ | 29 hr | |
| Feb 6, 7:05 PM CST | Rip Current Statement | JSJ | 55 hr | |
| Feb 11, 11:07 AM CST | Rip Current Statement | JSJ | 53 hr | |
| Feb 12, 3:18 AM CST | High Surf Advisory | JSJ | 28 hr | |
| Feb 14, 7:21 PM CST | Rip Current Statement | JSJ | 55 hr | |
| Feb 15, 3:14 PM CST | High Surf Advisory | JSJ | 17 hr | |
| Feb 23, 9:23 AM CST | Rip Current Statement | JSJ | 55 hr | |
| Feb 24, 6:08 AM CST | High Surf Advisory | JSJ | 18 hr | |
| Feb 28, 2:20 AM CST | Rip Current Statement | JSJ | 4 days | |
| Mar 5, 12:57 PM CST | Rip Current Statement | JSJ | 5 days | |
| Mar 6, 2:20 AM CST | High Surf Advisory | JSJ | 62 hr | |
| Mar 7, 12:39 AM CST | Coastal Flood Advisory | JSJ | 39 hr | |
| Mar 7, 3:50 AM CST | Coastal Flood Warning | JSJ | 23 hr | |
| Mar 7, 3:50 AM CST | High Surf Warning | JSJ | 23 hr | |
| Mar 7, 3:33 PM CST | Coastal Flood Advisory | JSJ | 24 hr | |
| Mar 7, 3:33 PM CST | High Surf Advisory | JSJ | 24 hr | |
| Mar 9, 2:35 AM CST | High Surf Advisory | JSJ | 13 hr | |
| Mar 10, 2:58 PM CST | Rip Current Statement | JSJ | 13 hr | |
| Mar 16, 8:21 PM CDT | Rip Current Statement | JSJ | 3 days | |
| Mar 21, 2:30 PM CDT | Rip Current Statement | JSJ | 53 hr | |
| Mar 24, 1:30 AM CDT | Areal Flood Advisory | JSJ | 8 hr | |
| Mar 25, 1:28 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Mar 25, 2:35 AM CDT | Rip Current Statement | JSJ | 48 hr | |
| Mar 25, 3:36 AM CDT | High Surf Advisory | JSJ | 30 hr | |
| Mar 29, 7:14 PM CDT | Rip Current Statement | JSJ | 56 hr | |
| Apr 1, 1:50 PM CDT | Rip Current Statement | JSJ | 27 hr | |
| Apr 1, 6:55 PM CDT | High Surf Advisory | JSJ | 22 hr | |
| Apr 2, 5:47 PM CDT | Rip Current Statement | JSJ | 5 days | |
| Apr 13, 3:42 AM CDT | Flash Flood Watch | JSJ | 6 days | |
| Apr 16, 4:19 AM CDT | Rip Current Statement | JSJ | 5 days | |
| Apr 16, 12:41 PM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Apr 17, 3:14 PM CDT | High Surf Advisory | JSJ | 61 hr | |
| Apr 22, 3:37 AM CDT | Rip Current Statement | JSJ | 4 days | |
| Apr 23, 8:46 PM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Apr 29, 1:25 AM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| May 1, 3:47 PM CDT | Rip Current Statement | JSJ | 61 hr | |
| May 11, 5:51 AM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| May 11, 8:45 AM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Jun 12, 7:45 PM CDT | Rip Current Statement | JSJ | 55 hr | |
| Jun 25, 6:49 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 29, 6:02 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 13, 3:54 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Jul 19, 3:11 AM CDT | Rip Current Statement | JSJ | 24 hr | |
| Aug 1, 2:17 AM CDT | Rip Current Statement | JSJ | 4 days | |
| Aug 7, 3:55 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 7, 5:44 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Aug 7, 6:51 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 7, 7:24 PM CDT | Areal Flood Advisory | JSJ | 8 hr | |
| Aug 8, 5:12 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 16, 4:13 AM CDT | Rip Current Statement | JSJ | 37 hr | |
| Aug 17, 8:08 PM CDT | Rip Current Statement | JSJ | 57 hr | |
| Aug 20, 2:15 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 2, 3:24 AM CDT | Rip Current Statement | JSJ | 50 hr | |
| Sep 4, 10:07 AM CDT | Hurricane Watch | JSJ | 13 hr | |
| Sep 4, 9:45 PM CDT | Hurricane Warning | JSJ | 56 hr | |
| Sep 5, 5:46 PM CDT | Flash Flood Watch | JSJ | 71 hr | |
| Sep 6, 10:16 AM CDT | Extreme Wind Warning | JSJ | 119 min | |
| Sep 6, 11:44 AM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Sep 6, 12:14 PM CDT | Extreme Wind Warning | JSJ | 61 min | |
| Sep 6, 1:13 PM CDT | Extreme Wind Warning | JSJ | 62 min | |
| Sep 6, 1:29 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Sep 6, 2:08 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Sep 6, 4:32 PM CDT | Flash Flood Warning | JSJ | 5 hr | |
| Sep 7, 10:45 AM CDT | Rip Current Statement | JSJ | 42 hr | |
| Sep 7, 2:20 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 8, 10:21 AM CDT | Tropical Storm Watch | JSJ | 27 hr | |
| Sep 8, 3:19 PM CDT | Rip Current Statement | JSJ | 60 hr | |
| Sep 9, 5:32 PM CDT | High Surf Advisory | JSJ | 19 hr | |
| Sep 14, 11:35 AM CDT | Areal Flood Advisory | JSJ | 8 hr | |
| Sep 14, 3:12 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 14, 5:13 PM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Sep 14, 7:03 PM CDT | Flash Flood Warning | JSJ | 2 hr | |
| Sep 14, 9:28 PM CDT | Flash Flood Warning | JSJ | 62 min | |
| Sep 15, 5:04 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 15, 7:36 AM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Sep 15, 9:25 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 17, 4:22 PM CDT | Hurricane Watch | JSJ | 24 hr | |
| Sep 18, 10:38 AM CDT | Hurricane Warning | JSJ | 72 hr | |
| Sep 18, 5:09 PM CDT | Flash Flood Watch | JSJ | 4 days | |
| Sep 19, 9:05 PM CDT | Flash Flood Warning | JSJ | 5 hr | |
| Sep 20, 12:20 AM CDT | Flash Flood Warning | JSJ | 5 hr | |
| Sep 20, 1:56 AM CDT | Flash Flood Warning | JSJ | 9 hr | |
| Sep 20, 6:06 AM CDT | Flash Flood Warning | JSJ | 5 hr | |
| Sep 21, 3:16 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 24, 3:26 PM CDT | Rip Current Statement | JSJ | 6 days | |
| Sep 28, 12:56 PM CDT | Flash Flood Watch | JSJ | 4 days | |
| Sep 29, 4:37 PM CDT | Areal Flood Advisory | JSJ | 113 min | |
| Sep 29, 11:39 PM CDT | Areal Flood Advisory | JSJ | 66 min | |
| Sep 30, 12:20 AM CDT | Areal Flood Advisory | JSJ | 115 min | |
| Sep 30, 4:28 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 30, 7:45 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 30, 9:45 PM CDT | Areal Flood Advisory | JSJ | 60 min | |
| Oct 9, 11:48 AM CDT | Flash Flood Watch | JSJ | 3 days | |
| Oct 9, 2:34 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 9, 5:55 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 10, 12:58 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 10, 10:03 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 11, 9:08 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 11, 10:16 AM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Oct 15, 6:49 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 15, 9:49 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 15, 12:54 PM CDT | Areal Flood Advisory | JSJ | 8 hr | |
| Oct 16, 8:23 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 16, 9:29 AM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Oct 16, 10:28 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 16, 6:02 PM CDT | Rip Current Statement | JSJ | 41 hr | |
| Oct 18, 3:45 PM CDT | Rip Current Statement | JSJ | 49 hr | |
| Oct 27, 8:43 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 28, 11:43 AM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Oct 28, 11:45 AM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Nov 6, 7:10 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 7, 7:13 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 8, 4:33 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 18, 7:10 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 18, 11:00 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 18, 11:22 AM CST | Areal Flood Advisory | JSJ | 113 min | |
| Nov 18, 6:49 PM CST | Areal Flood Advisory | JSJ | 116 min | |
| Nov 19, 11:40 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 26, 7:47 AM CST | Rip Current Statement | JSJ | 42 hr | |
| Dec 2, 10:53 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 5, 8:40 AM CST | Rip Current Statement | JSJ | 5 days | |
| Dec 5, 9:39 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 6, 10:35 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 6, 9:37 PM CST | High Surf Advisory | JSJ | 70 hr | |
| Dec 14, 8:44 AM CST | Rip Current Statement | JSJ | 55 hr | |
| Dec 17, 2:56 AM CST | Rip Current Statement | JSJ | 12 hr | |
| Dec 17, 2:28 PM CST | Rip Current Statement | JSJ | 38 hr | |
| Dec 26, 2:32 AM CST | Rip Current Statement | JSJ | 72 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Extreme Wind Warning | 3 |
| Flooding | |
| Flash Flood Warning | 14 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 52 |
| Tropical | |
| Hurricane Warning | 2 |
| Hurricane Watch | 2 |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| High Surf Warning | 1 |
| Coastal Flood Advisory | 4 |
| High Surf Advisory | 13 |
| Rip Current Statement | 37 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.