Alert archive / Mississippi / Harrison County
Weather alerts in Harrison County, Mississippi, 2009
94 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Harrison County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 94
- Warnings
- 41
- Watches
- 14
- Advisories
- 7
- Busiest month
- March30 alerts
- Busiest day
- March 27, 200912 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 6 tornado warnings covering Harrison County in 2009 had a tornado report inside them.
Harrison County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 3 | 50% | 0 | ||
| Severe thunderstorm warnings | 14 | 1 | 93% | 8 | 0% | |
| Flash flood warnings | 5 | 3 | 40% | 2 | 100% | 88 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS New Orleans, LA: tornado warnings | 73 | 8 | 89% | 20 | 30% | 19 min |
| NWS New Orleans, LA: severe thunderstorm warnings | 191 | 39 | 80% | 102 | 56% | 22 min |
| NWS New Orleans, LA: flash flood warnings | 59 | 24 | 59% | 66 | 85% | 88 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 | Lasted |
|---|---|---|---|
| Jan 3, 9:33 AM CST | Severe Thunderstorm Watch | SPC | 6 hr |
| Jan 3, 12:32 PM CST | Mesoscale Discussion | SPC | 88 min |
| Jan 6, 9:43 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 11, 9:36 AM CST | Mesoscale Discussion | SPC | 84 min |
| Feb 14, 4:15 AM CST | Areal Flood Advisory | LIX | 131 days |
| Feb 18, 4:58 PM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 26, 1:25 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Mar 26, 1:36 AM CDT | Tornado Watch | SPC | 9 hr |
| Mar 26, 3:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Mar 26, 5:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Mar 26, 5:56 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 26, 7:42 PM CDT | Areal Flood Advisory | LIX | 100 days |
| Mar 26, 11:00 PM CDT | Areal Flood Advisory | LIX | 104 days |
| Mar 26, 11:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Mar 27, 12:48 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 27, 1:12 AM CDT | Severe Thunderstorm Warning | LIX | 63 min |
| Mar 27, 1:39 AM CDT | Tornado Warning | LIX | 17 min |
| Mar 27, 1:59 AM CDT | Tornado Warning | LIX | 31 min |
| Mar 27, 2:13 AM CDT | Severe Thunderstorm Warning | LIX | 47 min |
| Mar 27, 2:23 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Mar 27, 9:28 AM CDT | River Flood Warning | LIX | 60 hr |
| Mar 27, 9:30 AM CDT | River Flood Warning | LIX | 4 days |
| Mar 27, 9:31 AM CDT | River Flood Warning | LIX | 3 days |
| Mar 27, 8:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 27, 10:09 PM CDT | Tornado Watch | SPC | 9 hr |
| Mar 27, 10:41 PM CDT | Severe Thunderstorm Warning | LIX | 34 min |
| Mar 27, 11:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 28, 12:51 AM CDT | Flash Flood Warning | LIX | 6 hr |
| Mar 28, 12:55 AM CDT | Severe Thunderstorm Warning | LIX | 39 min |
| Mar 28, 3:14 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Mar 28, 4:25 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Mar 28, 4:32 AM CDT | River Flood Warning | LIX | 6 days |
| Mar 28, 7:20 AM CDT | Areal Flood Warning | LIX | 4 hr |
| Mar 31, 11:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Mar 31, 1:05 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 31, 2:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Mar 31, 9:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Apr 2, 9:24 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 2, 11:51 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 2, 1:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Apr 2, 1:41 PM CDT | Tornado Warning | LIX | 34 min |
| Apr 2, 1:55 PM CDT | Tornado Warning | LIX | 35 min |
| Apr 2, 2:12 PM CDT | Tornado Warning | LIX | 33 min |
| Apr 2, 2:19 PM CDT | Severe Thunderstorm Warning | LIX | 41 min |
| Apr 12, 8:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 12, 8:30 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 12, 10:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 13, 2:33 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 3:14 AM CDT | Severe Thunderstorm Warning | LIX | 23 min |
| Apr 13, 1:44 PM CDT | River Flood Warning | LIX | 34 hr |
| Apr 19, 12:43 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 19, 2:19 PM CDT | Tornado Watch | SPC | 7 hr |
| May 3, 11:35 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 4:58 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 7:33 AM CDT | Tornado Watch | SPC | 6 hr |
| May 4, 1:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 11, 5:21 PM CDT | Severe Thunderstorm Warning | LIX | 54 min |
| Jun 24, 1:28 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 4, 4:41 PM CDT | Severe Thunderstorm Warning | LIX | 64 min |
| Jul 4, 5:15 PM CDT | Tornado Warning | LIX | 45 min |
| Jul 17, 5:27 PM CDT | Severe Thunderstorm Warning | LIX | 20 min |
| Jul 26, 5:17 PM CDT | Severe Thunderstorm Warning | LIX | 58 min |
| Jul 26, 5:58 PM CDT | Severe Thunderstorm Warning | LIX | 47 min |
| Aug 9, 2:59 PM CDT | Areal Flood Advisory | LIX | 2 hr |
| Aug 11, 2:50 PM CDT | Severe Thunderstorm Warning | LIX | 55 min |
| Aug 11, 3:35 PM CDT | Severe Thunderstorm Warning | LIX | 55 min |
| Aug 12, 3:24 PM CDT | Severe Thunderstorm Warning | LIX | 51 min |
| Aug 17, 1:44 PM CDT | Areal Flood Advisory | LIX | 2 hr |
| Aug 17, 2:12 PM CDT | Flash Flood Warning | LIX | 3 hr |
| Sep 22, 8:44 PM CDT | Flash Flood Warning | LIX | 3 hr |
| Sep 23, 2:18 PM CDT | River Flood Warning | LIX | 6 hr |
| Oct 4, 9:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Oct 14, 1:34 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Oct 22, 4:35 PM CDT | Tornado Watch | SPC | 4 hr |
| Oct 22, 8:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Dec 1, 2:28 PM CST | River Flood Warning | LIX | 20 hr |
| Dec 1, 2:33 PM CST | River Flood Warning | LIX | 20 hr |
| Dec 8, 8:33 AM CST | River Flood Warning | LIX | 60 hr |
| Dec 8, 8:41 AM CST | Areal Flood Advisory | LIX | 2 hr |
| Dec 8, 9:12 PM CST | River Flood Warning | LIX | 43 hr |
| Dec 12, 5:39 PM CST | Flash Flood Warning | LIX | 2 hr |
| Dec 12, 7:46 PM CST | Flash Flood Warning | LIX | 6 hr |
| Dec 12, 8:09 PM CST | River Flood Warning | LIX | 8 days |
| Dec 12, 8:12 PM CST | River Flood Warning | LIX | 8 days |
| Dec 12, 8:17 PM CST | River Flood Warning | LIX | 49 hr |
| Dec 14, 9:47 PM CST | Areal Flood Advisory | LIX | 3 hr |
| Dec 15, 3:22 AM CST | Mesoscale Discussion | SPC | 83 min |
| Dec 15, 10:06 AM CST | River Flood Warning | LIX | 26 hr |
| Dec 24, 8:40 AM CST | River Flood Warning | LIX | 48 hr |
| Dec 24, 9:34 AM CST | Mesoscale Discussion | SPC | 56 min |
| Dec 24, 10:13 AM CST | Mesoscale Discussion | SPC | 62 min |
| Dec 24, 10:37 AM CST | Tornado Watch | SPC | 7 hr |
| Dec 24, 1:14 PM CST | Mesoscale Discussion | SPC | 61 min |
| Dec 24, 3:33 PM CST | Mesoscale Discussion | SPC | 57 min |
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 | 14 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 11 |
| Mesoscale Discussion | 32 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 5 |
| River Flood Warning | 15 |
| Areal Flood Advisory | 7 |
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.