Alert archive / North Carolina / Alexander County
Weather alerts in Alexander County, North Carolina, 2009
111 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Alexander County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 111
- Warnings
- 28
- Watches
- 20
- Advisories
- 47
- Busiest month
- June22 alerts
- Busiest day
- May 9, 20096 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Alexander County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 8 | 47% | 5 | 100% | 26 min |
| Flash flood warnings | 2 | 2 | 0% | 3 | 100% | 61 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 33 | 8 | 76% | 15 | 93% | 21 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 394 | 237 | 40% | 457 | 86% | 26 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 55 | 40 | 27% | 103 | 73% | 94 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 8:01 AM EST | Winter Weather Advisory | GSP | 3 hr |
| Jan 2, 8:53 PM EST | Dense Fog Advisory | GSP | 15 hr |
| Jan 7, 5:14 AM EST | Wind Advisory | GSP | 19 hr |
| Jan 8, 4:33 AM EST | Lake Wind Advisory | GSP | 22 hr |
| Jan 10, 9:29 AM EST | Freezing Rain Advisory | GSP | 91 min |
| Jan 15, 2:31 AM EST | Wind Chill Advisory | GSP | 33 hr |
| Jan 19, 4:52 AM EST | Winter Storm Watch | GSP | 10 hr |
| Jan 19, 4:52 AM EST | Winter Weather Advisory | GSP | 31 hr |
| Jan 28, 3:57 AM EST | Lake Wind Advisory | GSP | 14 hr |
| Jan 28, 8:00 AM EST | Dense Fog Advisory | GSP | 3 hr |
| Feb 11, 3:22 AM EST | Wind Advisory | GSP | 19 hr |
| Feb 11, 12:17 PM EST | Fire Weather Watch | GSP | 18 hr |
| Feb 11, 10:21 PM EST | Lake Wind Advisory | GSP | 2 hr |
| Feb 12, 3:09 AM EST | Wind Advisory | GSP | 9 hr |
| Feb 12, 6:00 AM EST | Red Flag Warning | GSP | 15 hr |
| Feb 18, 3:10 PM EST | Lake Wind Advisory | GSP | 26 hr |
| Feb 28, 4:12 AM EST | Winter Storm Watch | GSP | 25 hr |
| Mar 1, 5:18 AM EST | Winter Storm Warning | GSP | 23 hr |
| Mar 2, 2:45 PM EST | Winter Weather Advisory | GSP | 18 hr |
| Mar 16, 3:16 PM EDT | Dense Fog Advisory | GSP | 18 hr |
| Mar 18, 5:13 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Mar 20, 3:17 AM EDT | Freeze Warning | GSP | 30 hr |
| Mar 21, 3:36 AM EDT | Frost Advisory | GSP | 29 hr |
| Mar 21, 10:49 PM EDT | Freeze Warning | GSP | 10 hr |
| Mar 27, 4:41 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Mar 29, 4:55 AM EDT | Wind Advisory | GSP | 17 hr |
| Mar 29, 8:07 PM EDT | Lake Wind Advisory | GSP | 2 hr |
| Apr 2, 3:06 PM EDT | Lake Wind Advisory | GSP | 27 hr |
| Apr 2, 3:06 PM EDT | Wind Advisory | GSP | 27 hr |
| Apr 6, 4:17 AM EDT | Freeze Watch | GSP | 23 hr |
| Apr 6, 4:17 AM EDT | Lake Wind Advisory | GSP | 16 hr |
| Apr 7, 3:31 AM EDT | Freeze Warning | GSP | 29 hr |
| Apr 8, 3:18 AM EDT | Lake Wind Advisory | GSP | 15 hr |
| Apr 16, 4:03 AM EDT | Frost Advisory | GSP | 28 hr |
| Apr 21, 3:41 AM EDT | Lake Wind Advisory | GSP | 16 hr |
| Apr 21, 1:14 PM EDT | Severe Thunderstorm Warning | GSP | 61 min |
| Apr 21, 2:19 PM EDT | Severe Thunderstorm Warning | GSP | 36 min |
| Apr 22, 10:01 AM EDT | Lake Wind Advisory | GSP | 8 hr |
| Apr 22, 10:16 AM EDT | Red Flag Warning | GSP | 10 hr |
| May 6, 2:16 PM EDT | Tornado Watch | SPC | 6 hr |
| May 8, 6:32 PM EDT | Tornado Watch | SPC | 7 hr |
| May 8, 8:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 9, 12:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 9, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 9, 2:45 PM EDT | Severe Thunderstorm Warning | GSP | 29 min |
| May 9, 3:51 PM EDT | Severe Thunderstorm Warning | GSP | 22 min |
| May 9, 4:05 PM EDT | Severe Thunderstorm Warning | GSP | 55 min |
| May 12, 4:58 AM EDT | Dense Fog Advisory | GSP | 5 hr |
| May 16, 6:40 PM EDT | Severe Thunderstorm Warning | GSP | 35 min |
| May 26, 3:24 AM EDT | Areal Flood Advisory | GSP | 111 min |
| May 26, 5:17 AM EDT | Areal Flood Advisory | GSP | 118 min |
| May 26, 8:23 AM EDT | Flash Flood Warning | GSP | 3 hr |
| May 26, 8:42 PM EDT | Areal Flood Advisory | GSP | 48 min |
| May 29, 3:41 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Jun 3, 12:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 3, 5:51 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Jun 3, 6:40 PM EDT | Areal Flood Advisory | GSP | 50 min |
| Jun 3, 10:11 PM EDT | Flash Flood Warning | GSP | 6 hr |
| Jun 4, 4:14 AM EDT | Areal Flood Advisory | GSP | 2 hr |
| Jun 4, 4:25 AM EDT | Flash Flood Watch | GSP | 32 hr |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 10, 6:12 PM EDT | Severe Thunderstorm Warning | GSP | 63 min |
| Jun 10, 6:18 PM EDT | Severe Thunderstorm Warning | GSP | 21 min |
| Jun 11, 3:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 11, 3:47 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 11, 5:11 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Jun 11, 6:07 PM EDT | Severe Thunderstorm Warning | GSP | 68 min |
| Jun 12, 2:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 15, 11:49 PM EDT | Flash Flood Watch | GSP | 9 hr |
| Jun 16, 5:57 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 8:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 16, 9:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 17, 3:17 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 3:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 3:13 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 4:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jul 20, 6:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 23, 4:36 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Aug 5, 3:56 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Aug 5, 4:39 PM EDT | Severe Thunderstorm Warning | GSP | 66 min |
| Aug 11, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 11, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 23, 1:13 AM EDT | Areal Flood Advisory | GSP | 62 min |
| Sep 9, 12:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Sep 9, 12:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Sep 12, 4:19 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Sep 19, 1:20 AM EDT | Dense Fog Advisory | GSP | 8 hr |
| Sep 26, 3:35 AM EDT | Flash Flood Watch | GSP | 17 hr |
| Oct 18, 4:14 AM EDT | Frost Advisory | GSP | 29 hr |
| Oct 19, 3:17 AM EDT | Frost Advisory | GSP | 30 hr |
| Nov 6, 3:22 AM EST | Frost Advisory | GSP | 30 hr |
| Nov 6, 2:38 PM EST | Freeze Warning | GSP | 18 hr |
| Nov 9, 2:26 AM EST | Flash Flood Watch | GSP | 3 days |
| Nov 11, 3:27 AM EST | Wind Advisory | GSP | 51 hr |
| Nov 11, 3:52 AM EST | Areal Flood Advisory | GSP | 6 hr |
| Nov 11, 11:25 AM EST | Areal Flood Warning | GSP | 6 hr |
| Nov 26, 12:41 AM EST | Dense Fog Advisory | GSP | 9 hr |
| Dec 1, 2:54 PM EST | Flash Flood Watch | GSP | 31 hr |
| Dec 8, 2:31 PM EST | High Wind Watch | GSP | 14 hr |
| Dec 8, 2:31 PM EST | High Wind Warning | GSP | 28 hr |
| Dec 9, 8:27 AM EST | Dense Fog Advisory | GSP | 93 min |
| Dec 13, 7:18 PM EST | Dense Fog Advisory | GSP | 17 hr |
| Dec 15, 8:06 AM EST | Dense Fog Advisory | GSP | 4 hr |
| Dec 16, 5:07 PM EST | Winter Storm Watch | GSP | 24 hr |
| Dec 17, 3:53 PM EST | Winter Storm Warning | GSP | 3 days |
| Dec 18, 1:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 18, 7:22 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 24, 4:05 AM EST | Ice Storm Warning | GSP | 32 hr |
| Dec 25, 10:08 AM EST | Flash Flood Watch | GSP | 6 hr |
| Dec 25, 9:43 PM EST | Dense Fog Advisory | GSP | 9 hr |
| Dec 30, 2:48 PM EST | Winter Weather Advisory | GSP | 18 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.