Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2010
131 weather alerts in 2010, 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
- 131
- Warnings
- 30
- Watches
- 18
- Advisories
- 83
- Busiest month
- October26 alerts
- Busiest day
- October 6, 20107 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, 2010
| 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 | 25 | 3 | 88% | 6 | 83% | 175 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| NWS JSJ: severe thunderstorm warnings | 6 | 1 | 83% | 15 | 7% | 36 min |
| NWS JSJ: flash flood warnings | 149 | 40 | 73% | 88 | 55% | 105 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 3, 12:26 PM CST | High Surf Advisory | JSJ | 68 hr | |
| Jan 24, 12:45 PM CST | High Surf Advisory | JSJ | 49 hr | |
| Feb 6, 10:32 PM CST | High Surf Advisory | JSJ | 21 hr | |
| Feb 9, 1:52 AM CST | High Surf Advisory | JSJ | 18 hr | |
| Feb 10, 2:10 AM CST | Coastal Flood Watch | JSJ | 72 hr | |
| Feb 13, 8:08 AM CST | High Surf Advisory | JSJ | 18 hr | |
| Feb 19, 3:39 AM CST | High Surf Advisory | JSJ | 33 hr | |
| Feb 26, 12:53 PM CST | High Surf Advisory | JSJ | 43 hr | |
| Mar 3, 4:59 PM CST | High Surf Advisory | JSJ | 11 hr | |
| Mar 5, 4:19 AM CST | High Surf Advisory | JSJ | 33 hr | |
| Mar 6, 1:46 AM CST | Flash Flood Watch | JSJ | 38 hr | |
| Mar 29, 3:10 AM CDT | High Surf Advisory | JSJ | 3 days | |
| Apr 3, 2:26 PM CDT | High Surf Advisory | JSJ | 20 hr | |
| Apr 23, 12:04 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 2, 9:40 AM CDT | Areal Flood Advisory | JSJ | 110 min | |
| May 7, 5:35 PM CDT | Areal Flood Advisory | JSJ | 76 min | |
| May 18, 3:32 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 18, 6:28 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| May 26, 2:00 PM CDT | Flash Flood Watch | JSJ | 5 days | |
| May 27, 9:33 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 27, 1:31 PM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| May 27, 5:22 PM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Jun 18, 3:49 AM CDT | Flash Flood Watch | JSJ | 71 hr | |
| Jun 18, 8:28 PM CDT | Areal Flood Advisory | JSJ | 102 min | |
| Jun 19, 5:56 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 19, 9:17 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 20, 12:02 AM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Jun 20, 6:56 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 20, 10:03 AM CDT | Areal Flood Advisory | JSJ | 117 min | |
| Jun 20, 12:19 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 20, 3:16 PM CDT | Areal Flood Advisory | JSJ | 94 min | |
| Jun 20, 6:09 PM CDT | Areal Flood Advisory | JSJ | 111 min | |
| Jun 20, 7:57 PM CDT | Areal Flood Advisory | JSJ | 79 min | |
| Jun 21, 4:49 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Jun 21, 5:38 PM CDT | Flash Flood Watch | JSJ | 10 hr | |
| Jun 25, 7:01 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 13, 7:48 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 19, 11:22 AM CDT | Flash Flood Watch | JSJ | 3 days | |
| Jul 19, 12:13 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 19, 1:55 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Jul 20, 6:50 AM CDT | Areal Flood Advisory | JSJ | 108 min | |
| Jul 20, 11:05 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 20, 12:14 PM CDT | Flash Flood Warning | JSJ | 12 hr | |
| Jul 20, 1:04 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Jul 20, 7:01 PM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Jul 21, 4:50 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 22, 5:49 PM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Aug 28, 4:00 PM CDT | Tropical Storm Watch | NHC | 6 days | |
| Aug 28, 6:27 PM CDT | Tropical Storm Watch | JSJ | 6 hr | |
| Aug 28, 10:00 PM CDT | Hurricane Watch | NHC | 5 days | |
| Aug 28, 11:39 PM CDT | Hurricane Watch | JSJ | 42 hr | |
| Aug 29, 10:00 AM CDT | Tropical Storm Warning | NHC | 7 days | |
| Aug 29, 10:57 AM CDT | Tropical Storm Warning | JSJ | 43 hr | |
| Aug 29, 5:39 PM CDT | Flash Flood Watch | JSJ | 48 hr | |
| Aug 30, 4:00 AM CDT | Hurricane Warning | NHC | 5 days | |
| Aug 30, 6:17 AM CDT | Hurricane Warning | JSJ | 22 hr | |
| Aug 30, 7:30 AM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Aug 30, 12:14 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 30, 1:00 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Aug 30, 4:31 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Aug 30, 7:15 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Aug 30, 10:15 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Aug 31, 12:52 PM CDT | Areal Flood Advisory | JSJ | 77 min | |
| Sep 11, 12:46 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 11, 1:05 PM CDT | Flash Flood Watch | JSJ | 7 hr | |
| Sep 16, 1:59 PM CDT | High Surf Advisory | JSJ | 5 days | |
| Sep 17, 1:30 PM CDT | Coastal Flood Warning | JSJ | 14 hr | |
| Sep 19, 12:14 PM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Sep 19, 1:51 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 22, 7:57 PM CDT | High Surf Advisory | JSJ | 41 hr | |
| Oct 1, 8:33 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 1, 11:31 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 1, 1:42 PM CDT | Flash Flood Watch | JSJ | 13 hr | |
| Oct 2, 2:05 AM CDT | Flash Flood Watch | JSJ | 7 days | |
| Oct 5, 6:41 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 5, 12:10 PM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Oct 5, 5:37 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 5, 7:15 PM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Oct 5, 8:34 PM CDT | Flash Flood Warning | JSJ | 11 hr | |
| Oct 5, 8:55 PM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Oct 6, 3:50 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 6, 7:07 AM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 6, 7:49 AM CDT | Flash Flood Warning | JSJ | 12 hr | |
| Oct 6, 10:59 AM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 7, 2:21 AM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 7, 5:12 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 7, 6:28 AM CDT | Flash Flood Warning | JSJ | 2 hr | |
| Oct 7, 8:40 AM CDT | Areal Flood Advisory | JSJ | 15 hr | |
| Oct 7, 10:20 AM CDT | Areal Flood Advisory | JSJ | 9 hr | |
| Oct 7, 7:13 PM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Oct 8, 1:16 AM CDT | Areal Flood Advisory | JSJ | 4 hr | |
| Oct 8, 11:38 AM CDT | Flash Flood Warning | JSJ | 12 min | |
| Oct 8, 11:53 AM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 8, 12:10 PM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 30, 4:14 PM CDT | High Surf Advisory | JSJ | 39 hr | |
| Oct 31, 11:26 AM CDT | Wind Advisory | JSJ | 20 hr | |
| Nov 5, 11:48 PM CDT | Flash Flood Watch | JSJ | 6 days | |
| Nov 7, 1:53 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 7, 3:54 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 7, 4:17 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 7, 10:26 AM CST | Areal Flood Advisory | JSJ | 4 hr | |
| Nov 7, 10:28 AM CST | Areal Flood Advisory | JSJ | 7 hr | |
| Nov 7, 12:50 PM CST | High Surf Advisory | JSJ | 66 hr | |
| Nov 7, 2:31 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 7, 10:23 PM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 8, 12:08 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 8, 12:47 AM CST | Flash Flood Warning | JSJ | 103 min | |
| Nov 8, 1:08 AM CST | Flash Flood Warning | JSJ | 101 min | |
| Nov 8, 5:37 PM CST | Flash Flood Warning | JSJ | 3 hr | |
| Nov 10, 4:31 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 10, 5:41 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 10, 5:54 AM CST | Flash Flood Warning | JSJ | 4 hr | |
| Nov 10, 8:34 AM CST | Flash Flood Warning | JSJ | 3 hr | |
| Nov 10, 8:37 AM CST | Flash Flood Warning | JSJ | 8 hr | |
| Nov 11, 2:59 AM CST | Areal Flood Advisory | JSJ | 5 hr | |
| Nov 11, 11:51 AM CST | Areal Flood Advisory | JSJ | 114 min | |
| Nov 11, 12:15 PM CST | Flash Flood Warning | JSJ | 2 hr | |
| Nov 11, 7:46 PM CST | Areal Flood Advisory | JSJ | 2 hr | |
| Nov 12, 1:34 AM CST | High Surf Advisory | JSJ | 4 days | |
| Nov 13, 10:07 AM CST | Coastal Flood Watch | JSJ | 28 hr | |
| Nov 22, 3:05 AM CST | Areal Flood Advisory | JSJ | 55 min | |
| Nov 26, 12:58 PM CST | High Surf Advisory | JSJ | 39 hr | |
| Dec 1, 2:06 AM CST | High Surf Advisory | JSJ | 41 hr | |
| Dec 9, 6:29 AM CST | High Surf Advisory | JSJ | 34 hr | |
| Dec 14, 12:17 PM CST | High Surf Advisory | JSJ | 49 hr | |
| Dec 15, 7:17 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 20, 10:06 PM CST | Flash Flood Watch | JSJ | 4 hr | |
| Dec 21, 9:34 AM CST | High Surf Advisory | JSJ | 71 hr | |
| Dec 23, 2:06 AM CST | Coastal Flood Watch | JSJ | 10 hr | |
| Dec 24, 1:04 PM CST | High Surf Advisory | JSJ | 65 hr | |
| Dec 27, 12:16 PM CST | High Surf Advisory | JSJ | 4 days |
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 | 25 |
| Flash Flood Watch | 11 |
| Areal Flood Advisory | 59 |
| Wind and dust | |
| Wind Advisory | 1 |
| Tropical | |
| Hurricane Warning | 2 |
| Tropical Storm Warning | 2 |
| Hurricane Watch | 2 |
| Tropical Storm Watch | 2 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Watch | 3 |
| High Surf Advisory | 23 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.