Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2018
95 weather alerts in 2018, 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
- 95
- Warnings
- 3
- Watches
- 6
- Advisories
- 48
- Busiest month
- November15 alerts
- Busiest day
- March 4, 20185 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, 2018
| 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 | 1 | 1 | 0% | 3 | 100% | 32 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: severe thunderstorm warnings | 1 | 0 | 100% | 2 | 0% | |
| NWS JSJ: flash flood warnings | 21 | 8 | 62% | 49 | 57% | 43 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 5, 3:13 AM CST | Rip Current Statement | JSJ | 13 days | |
| Jan 5, 3:37 PM CST | High Surf Advisory | JSJ | 4 days | |
| Jan 6, 11:02 AM CST | Coastal Flood Advisory | JSJ | 15 hr | |
| Jan 7, 2:07 AM CST | Coastal Flood Advisory | JSJ | 12 hr | |
| Jan 9, 8:58 PM CST | Tsunami Advisory | HEB | 76 min | |
| Jan 19, 6:56 PM CST | Rip Current Statement | JSJ | 4 days | |
| Jan 25, 2:44 PM CST | Rip Current Statement | JSJ | 24 days | |
| Jan 26, 11:38 AM CST | Wind Advisory | JSJ | 46 hr | |
| Jan 26, 7:22 PM CST | High Surf Advisory | JSJ | 7 days | |
| Jan 27, 3:35 AM CST | Coastal Flood Advisory | JSJ | 50 hr | |
| Feb 10, 2:23 PM CST | Rip Current Statement | JSJ | 71 hr | |
| Feb 11, 3:50 AM CST | High Surf Advisory | JSJ | 4 days | |
| Feb 12, 6:55 AM CST | Wind Advisory | JSJ | 33 hr | |
| Feb 12, 7:54 AM CST | Rip Current Statement | JSJ | 3 days | |
| Feb 18, 6:49 PM CST | Rip Current Statement | JSJ | 7 days | |
| Feb 19, 2:46 AM CST | Wind Advisory | JSJ | 13 hr | |
| Feb 20, 3:27 AM CST | Wind Advisory | JSJ | 13 hr | |
| Feb 21, 2:27 AM CST | Wind Advisory | JSJ | 17 hr | |
| Feb 21, 2:43 AM CST | High Surf Advisory | JSJ | 4 days | |
| Feb 22, 2:32 AM CST | Wind Advisory | JSJ | 13 hr | |
| Feb 27, 2:02 AM CST | Rip Current Statement | JSJ | 14 days | |
| Feb 27, 2:18 PM CST | Rip Current Statement | JSJ | 14 days | |
| Mar 1, 2:06 AM CST | High Surf Advisory | JSJ | 35 hr | |
| Mar 2, 2:03 PM CST | Coastal Flood Watch | JSJ | 38 hr | |
| Mar 3, 2:58 AM CST | High Surf Advisory | JSJ | 3 days | |
| Mar 4, 3:42 AM CST | Coastal Flood Warning | JSJ | 4 days | |
| Mar 4, 3:42 AM CST | Coastal Flood Advisory | JSJ | 48 hr | |
| Mar 4, 3:42 AM CST | Coastal Flood Advisory | JSJ | 14 hr | |
| Mar 4, 3:42 AM CST | High Surf Warning | JSJ | 4 days | |
| Mar 4, 3:42 AM CST | High Surf Advisory | JSJ | 14 hr | |
| Mar 5, 8:47 AM CST | High Surf Advisory | JSJ | 5 days | |
| Mar 7, 11:06 AM CST | Coastal Flood Advisory | JSJ | 40 hr | |
| Mar 14, 3:53 AM CDT | Rip Current Statement | JSJ | 71 hr | |
| Mar 27, 2:09 AM CDT | Rip Current Statement | JSJ | 5 days | |
| Mar 27, 10:38 AM CDT | High Surf Advisory | JSJ | 3 days | |
| Apr 9, 2:43 AM CDT | Rip Current Statement | JSJ | 9 days | |
| Apr 18, 3:39 PM CDT | Rip Current Statement | JSJ | 4 days | |
| Apr 19, 3:25 AM CDT | High Surf Advisory | JSJ | 4 hr | |
| Apr 22, 7:55 PM CDT | Rip Current Statement | JSJ | 33 hr | |
| Apr 28, 7:46 PM CDT | Rip Current Statement | JSJ | 22 hr | |
| May 3, 3:37 PM CDT | Rip Current Statement | JSJ | 4 days | |
| May 17, 6:42 PM CDT | Rip Current Statement | JSJ | 4 days | |
| Jun 19, 12:14 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Jun 19, 1:21 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 23, 4:07 PM CDT | Rip Current Statement | JSJ | 58 hr | |
| Jul 7, 7:16 PM CDT | Rip Current Statement | JSJ | 3 days | |
| Jul 8, 12:59 PM CDT | Flash Flood Watch | JSJ | 38 hr | |
| Jul 8, 1:00 PM CDT | High Surf Advisory | JSJ | 29 hr | |
| Aug 30, 5:46 AM CDT | Areal Flood Advisory | JSJ | 16 hr | |
| Aug 30, 12:03 PM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Aug 30, 5:02 PM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Sep 6, 3:54 PM CDT | Rip Current Statement | JSJ | 23 hr | |
| Sep 7, 2:47 PM CDT | Rip Current Statement | JSJ | 9 days | |
| Sep 10, 4:07 AM CDT | Rip Current Statement | JSJ | 7 days | |
| Sep 11, 8:29 PM CDT | Rip Current Statement | JSJ | 3 days | |
| Sep 13, 10:57 AM CDT | High Surf Advisory | JSJ | 29 hr | |
| Sep 14, 9:52 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 22, 8:33 PM CDT | Rip Current Statement | JSJ | 9 days | |
| Sep 27, 3:06 PM CDT | Coastal Flood Watch | JSJ | 36 hr | |
| Sep 27, 3:06 PM CDT | Rip Current Statement | JSJ | 4 days | |
| Sep 27, 3:06 PM CDT | High Surf Advisory | JSJ | 4 days | |
| Sep 27, 3:15 PM CDT | Flash Flood Watch | JSJ | 51 hr | |
| Sep 29, 3:30 AM CDT | Coastal Flood Advisory | JSJ | 37 hr | |
| Oct 2, 4:06 PM CDT | Rip Current Statement | JSJ | 5 days | |
| Oct 2, 4:06 PM CDT | Rip Current Statement | JSJ | 5 days | |
| Oct 3, 3:56 AM CDT | High Surf Advisory | JSJ | 61 hr | |
| Oct 8, 3:37 PM CDT | Rip Current Statement | JSJ | 5 days | |
| Oct 12, 6:45 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Oct 12, 11:53 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 12, 2:44 PM CDT | Areal Flood Advisory | JSJ | 61 min | |
| Oct 13, 4:28 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 16, 3:57 PM CDT | Rip Current Statement | JSJ | 61 hr | |
| Oct 29, 3:58 PM CDT | Rip Current Statement | JSJ | 35 hr | |
| Nov 2, 2:45 AM CDT | Rip Current Statement | JSJ | 5 days | |
| Nov 8, 2:26 AM CST | Areal Flood Advisory | JSJ | 7 hr | |
| Nov 8, 5:13 AM CST | Areal Flood Advisory | JSJ | 112 min | |
| Nov 8, 5:51 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 8, 6:45 AM CST | Flash Flood Warning | JSJ | 4 hr | |
| Nov 8, 10:31 PM CST | Areal Flood Advisory | JSJ | 119 min | |
| Nov 10, 10:07 PM CST | Areal Flood Advisory | JSJ | 113 min | |
| Nov 11, 12:06 AM CST | Areal Flood Advisory | JSJ | 54 min | |
| Nov 12, 2:27 AM CST | Rip Current Statement | JSJ | 6 days | |
| Nov 13, 8:19 AM CST | Flash Flood Watch | JSJ | 7 hr | |
| Nov 13, 8:19 AM CST | Flash Flood Watch | JSJ | 42 hr | |
| Nov 13, 12:26 PM CST | Areal Flood Advisory | JSJ | 2 hr | |
| Nov 13, 5:19 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 24, 1:11 PM CST | Rip Current Statement | JSJ | 37 hr | |
| Nov 29, 2:35 PM CST | Rip Current Statement | JSJ | 5 days | |
| Dec 4, 2:36 AM CST | Rip Current Statement | JSJ | 61 hr | |
| Dec 12, 5:03 PM CST | Rip Current Statement | JSJ | 5 days | |
| Dec 19, 6:03 PM CST | Rip Current Statement | JSJ | 57 hr | |
| Dec 23, 1:31 AM CST | Rip Current Statement | JSJ | 24 hr | |
| Dec 26, 2:48 PM CST | Rip Current Statement | JSJ | 9 days | |
| Dec 27, 2:01 PM CST | Wind Advisory | JSJ | 3 days | |
| Dec 27, 3:43 PM CST | High Surf Advisory | JSJ | 48 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 18 |
| Wind and dust | |
| Wind Advisory | 7 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| High Surf Warning | 1 |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 7 |
| High Surf Advisory | 15 |
| Tsunami Advisory | 1 |
| Rip Current Statement | 38 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.