Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2008
87 weather alerts in 2008, 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
- 87
- Warnings
- 19
- Watches
- 17
- Advisories
- 51
- Busiest month
- September35 alerts
- Busiest day
- September 8, 20086 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, 2008
| 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 | 12 | 0 | 100% | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: severe thunderstorm warnings | 2 | 0 | 100% | 3 | 0% | |
| NWS JSJ: flash flood warnings | 87 | 0 | 100% | 10 | 0% |
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 |
|---|---|---|---|---|
| Mar 17, 10:06 AM CDT | Coastal Flood Watch | JSJ | 48 hr | |
| Mar 18, 9:18 AM CDT | High Surf Advisory | JSJ | 3 days | |
| Mar 19, 9:36 AM CDT | Coastal Flood Watch | JSJ | 49 hr | |
| Mar 19, 9:36 AM CDT | Coastal Flood Warning | JSJ | 57 hr | |
| Mar 19, 9:36 AM CDT | High Surf Warning | JSJ | 57 hr | |
| Mar 21, 6:32 PM CDT | High Surf Advisory | JSJ | 15 hr | |
| Mar 27, 9:07 AM CDT | Coastal Flood Watch | JSJ | 9 hr | |
| Mar 27, 9:07 AM CDT | High Surf Advisory | JSJ | 30 hr | |
| Mar 28, 5:48 PM CDT | High Surf Advisory | JSJ | 21 hr | |
| Apr 1, 11:55 AM CDT | Wind Advisory | JSJ | 9 hr | |
| Apr 1, 2:46 PM CDT | High Surf Advisory | JSJ | 72 hr | |
| Apr 2, 4:02 AM CDT | Wind Advisory | JSJ | 39 hr | |
| Apr 27, 9:42 AM CDT | Flash Flood Watch | JSJ | 11 hr | |
| Apr 28, 2:27 AM CDT | Flash Flood Warning | JSJ | 2 hr | |
| Apr 29, 4:04 AM CDT | High Surf Advisory | JSJ | 32 days | |
| May 14, 9:49 PM CDT | High Surf Advisory | JSJ | 59 hr | |
| Jun 20, 11:40 AM CDT | Wind Advisory | JSJ | 6 hr | |
| Jun 23, 12:15 PM CDT | Wind Advisory | JSJ | 9 hr | |
| Jul 31, 11:24 AM CDT | Areal Flood Advisory | JSJ | 106 min | |
| Aug 1, 11:42 PM CDT | Areal Flood Advisory | JSJ | 98 min | |
| Aug 14, 11:53 AM CDT | Flash Flood Watch | JSJ | 28 hr | |
| Aug 14, 10:19 PM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Aug 15, 4:05 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 15, 7:03 AM CDT | Areal Flood Advisory | JSJ | 117 min | |
| Aug 30, 3:39 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 30, 6:35 PM CDT | Areal Flood Advisory | JSJ | 115 min | |
| Sep 2, 7:28 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 2, 8:54 AM CDT | Flash Flood Watch | JSJ | 10 hr | |
| Sep 2, 10:17 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 3, 12:31 AM CDT | Flood Watch | JSJ | 28 hr | |
| Sep 3, 7:43 AM CDT | Areal Flood Advisory | JSJ | 92 min | |
| Sep 3, 7:45 AM CDT | Flash Flood Watch | JSJ | 3 hr | |
| Sep 3, 1:27 PM CDT | Wind Advisory | JSJ | 8 hr | |
| Sep 3, 4:39 PM CDT | High Surf Advisory | JSJ | 16 hr | |
| Sep 3, 10:16 PM CDT | Flash Flood Warning | JSJ | 8 hr | |
| Sep 5, 1:18 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 5, 6:36 AM CDT | High Surf Advisory | JSJ | 14 hr | |
| Sep 8, 3:01 PM CDT | Flash Flood Watch | JSJ | 10 hr | |
| Sep 8, 3:42 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 8, 4:08 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Sep 8, 4:36 PM CDT | Flash Flood Warning | JSJ | 114 min | |
| Sep 8, 4:45 PM CDT | Flash Flood Warning | JSJ | 107 min | |
| Sep 8, 6:41 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 9, 5:46 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 12, 4:52 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 20, 6:39 PM CDT | Flash Flood Watch | JSJ | 3 days | |
| Sep 21, 1:32 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 21, 4:38 AM CDT | Areal Flood Advisory | JSJ | 6 hr | |
| Sep 21, 10:08 AM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Sep 21, 1:01 PM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Sep 21, 1:03 PM CDT | High Surf Advisory | JSJ | 16 hr | |
| Sep 21, 4:56 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Sep 21, 10:49 PM CDT | Flash Flood Warning | JSJ | 78 min | |
| Sep 22, 11:35 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 22, 2:33 PM CDT | Areal Flood Advisory | JSJ | 7 hr | |
| Sep 23, 8:42 AM CDT | Areal Flood Advisory | JSJ | 93 min | |
| Sep 23, 7:16 PM CDT | Flash Flood Watch | JSJ | 32 hr | |
| Sep 23, 10:25 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Sep 28, 9:05 PM CDT | High Surf Advisory | JSJ | 34 hr | |
| Sep 30, 3:11 AM CDT | High Surf Advisory | JSJ | 54 hr | |
| Sep 30, 5:44 PM CDT | Coastal Flood Watch | JSJ | 22 hr | |
| Oct 11, 3:17 PM CDT | Flash Flood Watch | JSJ | 5 days | |
| Oct 12, 6:31 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 13, 4:00 PM CDT | Tropical Storm Watch | NHC | 24 hr | |
| Oct 13, 7:18 PM CDT | Tropical Storm Watch | JSJ | 23 hr | |
| Oct 13, 8:19 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Oct 14, 4:00 PM CDT | Hurricane Watch | NHC | 34 hr | |
| Oct 14, 4:00 PM CDT | Tropical Storm Warning | NHC | 34 hr | |
| Oct 14, 6:34 PM CDT | Hurricane Watch | JSJ | 33 hr | |
| Oct 14, 6:34 PM CDT | Tropical Storm Warning | JSJ | 33 hr | |
| Oct 14, 10:00 PM CDT | Hurricane Warning | NHC | 30 hr | |
| Oct 15, 2:02 AM CDT | Hurricane Warning | JSJ | 27 hr | |
| Oct 15, 12:39 PM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Oct 15, 4:40 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Oct 15, 5:53 PM CDT | Coastal Flood Warning | JSJ | 13 hr | |
| Oct 15, 9:25 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Oct 15, 10:26 PM CDT | Flash Flood Warning | JSJ | 6 hr | |
| Oct 21, 4:16 AM CDT | High Surf Advisory | JSJ | 47 hr | |
| Oct 25, 3:28 PM CDT | High Surf Advisory | JSJ | 66 hr | |
| Nov 6, 5:09 PM CST | Areal Flood Advisory | JSJ | 2 hr | |
| Nov 6, 7:31 PM CST | Areal Flood Advisory | JSJ | 5 hr | |
| Nov 20, 2:20 AM CST | High Surf Advisory | JSJ | 58 hr | |
| Nov 23, 7:13 PM CST | High Surf Advisory | JSJ | 45 hr | |
| Nov 26, 6:55 PM CST | High Surf Advisory | JSJ | 47 hr | |
| Dec 9, 2:15 PM CST | Wind Advisory | JSJ | 21 hr | |
| Dec 16, 3:24 AM CST | High Surf Advisory | JSJ | 51 hr | |
| Dec 25, 2:01 AM CST | High Surf Advisory | JSJ | 7 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 | 12 |
| Flash Flood Watch | 8 |
| Flood Watch | 1 |
| Areal Flood Advisory | 26 |
| Wind and dust | |
| Wind Advisory | 6 |
| Tropical | |
| Hurricane Warning | 2 |
| Tropical Storm Warning | 2 |
| Hurricane Watch | 2 |
| Tropical Storm Watch | 2 |
| Coast and beach | |
| Coastal Flood Warning | 2 |
| High Surf Warning | 1 |
| Coastal Flood Watch | 4 |
| High Surf Advisory | 19 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20072009
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.