Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2013
60 weather alerts in 2013, 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
- 60
- Warnings
- 6
- Watches
- 7
- Advisories
- 47
- Busiest month
- December10 alerts
- Busiest day
- January 11, 20133 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, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 1 | 0% | 1 | 100% | 47 min |
| Flash flood warnings | 3 | 1 | 67% | 3 | 100% | 49 min |
Each office's whole area, 2013
| 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 | 1 | 0% | 9 | 11% | 47 min |
| NWS JSJ: flash flood warnings | 41 | 17 | 59% | 66 | 55% | 55 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 |
|---|---|---|---|---|
| Dec 31, 6:46 PM CST | High Surf Advisory | JSJ | 3 days | |
| Jan 11, 3:09 PM CST | Coastal Flood Watch | JSJ | 43 hr | |
| Jan 11, 3:09 PM CST | High Surf Warning | JSJ | 3 days | |
| Jan 11, 3:09 PM CST | High Surf Advisory | JSJ | 3 days | |
| Jan 13, 10:21 AM CST | Coastal Flood Advisory | JSJ | 3 hr | |
| Jan 13, 1:29 PM CST | Coastal Flood Warning | JSJ | 23 hr | |
| Jan 14, 11:37 AM CST | Coastal Flood Advisory | JSJ | 26 hr | |
| Jan 15, 1:42 AM CST | High Surf Advisory | JSJ | 41 hr | |
| Jan 26, 6:16 AM CST | High Surf Advisory | JSJ | 46 hr | |
| Feb 11, 2:45 AM CST | High Surf Advisory | JSJ | 55 hr | |
| Feb 18, 1:48 PM CST | High Surf Advisory | JSJ | 54 hr | |
| Feb 24, 1:01 PM CST | High Surf Advisory | JSJ | 48 hr | |
| Mar 8, 12:46 PM CST | Coastal Flood Watch | JSJ | 67 hr | |
| Mar 8, 12:46 PM CST | High Surf Advisory | JSJ | 7 days | |
| Mar 11, 9:09 AM CDT | Coastal Flood Advisory | JSJ | 12 hr | |
| Mar 29, 11:14 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Apr 27, 2:07 PM CDT | High Surf Advisory | JSJ | 48 hr | |
| May 10, 7:37 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 21, 1:07 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 24, 4:40 AM CDT | Flash Flood Watch | JSJ | 43 hr | |
| May 27, 7:02 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 3, 11:13 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 19, 11:05 AM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Jun 19, 3:03 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 26, 5:14 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Jul 8, 10:00 AM CDT | Tropical Storm Watch | NHC | 42 hr | |
| Jul 8, 10:27 AM CDT | Tropical Storm Watch | JSJ | 42 hr | |
| Jul 9, 3:52 AM CDT | Flash Flood Watch | JSJ | 33 hr | |
| Jul 9, 3:32 PM CDT | Severe Thunderstorm Warning | JSJ | 58 min | |
| Jul 28, 5:52 PM CDT | Areal Flood Advisory | JSJ | 113 min | |
| Sep 3, 1:45 PM CDT | Flash Flood Watch | JSJ | 3 days | |
| Sep 4, 11:03 AM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Sep 5, 2:32 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 5, 3:09 AM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Sep 5, 7:49 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 5, 9:11 PM CDT | Flash Flood Warning | JSJ | 7 hr | |
| Sep 6, 3:38 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 9, 7:54 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 21, 1:13 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Oct 29, 12:45 AM CDT | Areal Flood Advisory | JSJ | 60 min | |
| Oct 29, 2:06 AM CDT | Areal Flood Advisory | JSJ | 114 min | |
| Nov 2, 1:49 PM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Nov 2, 3:05 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 2, 8:56 PM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Nov 3, 4:21 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 3, 9:32 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 14, 2:29 PM CST | High Surf Advisory | JSJ | 7 days | |
| Nov 21, 8:35 AM CST | Areal Flood Advisory | JSJ | 115 min | |
| Nov 26, 2:55 AM CST | High Surf Advisory | JSJ | 33 hr | |
| Nov 30, 5:13 PM CST | Areal Flood Advisory | JSJ | 2 hr | |
| Nov 30, 10:24 PM CST | Areal Flood Advisory | JSJ | 8 hr | |
| Dec 4, 11:54 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 5, 9:38 AM CST | Areal Flood Advisory | JSJ | 112 min | |
| Dec 7, 8:42 AM CST | High Surf Advisory | JSJ | 65 hr | |
| Dec 23, 2:13 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 23, 2:27 PM CST | Flash Flood Warning | JSJ | 3 hr | |
| Dec 24, 12:48 PM CST | Areal Flood Advisory | JSJ | 117 min | |
| Dec 24, 2:02 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 24, 9:36 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 25, 12:29 AM CST | Areal Flood Advisory | JSJ | 6 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 | |
| Severe Thunderstorm Warning | 1 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 32 |
| Tropical | |
| Tropical Storm Watch | 2 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| High Surf Warning | 1 |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 3 |
| High Surf Advisory | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20122014
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.