Alert archive / Louisiana / Grant Parish
Weather alerts in Grant Parish, Louisiana, 2011
109 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Grant Parish and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 109
- Warnings
- 30
- Watches
- 18
- Advisories
- 30
- Busiest month
- April27 alerts
- Busiest day
- April 27, 20117 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
4 of 4 tornado warnings covering Grant Parish in 2011 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 3 minutes after it went out.
Grant Parish, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 4 | 0% | 2 | 50% | 3 min |
| Severe thunderstorm warnings | 15 | 9 | 40% | 4 | 100% | 14 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 52 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Shreveport, LA: tornado warnings | 97 | 50 | 48% | 104 | 84% | 18 min |
| NWS Shreveport, LA: severe thunderstorm warnings | 423 | 256 | 39% | 543 | 78% | 24 min |
| NWS Shreveport, LA: flash flood warnings | 13 | 9 | 31% | 29 | 97% | 97 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 7, 3:30 PM CST | Winter Storm Watch | SHV | 28 hr |
| Jan 11, 4:05 AM CST | Hard Freeze Warning | SHV | 29 hr |
| Jan 31, 2:57 AM CST | Dense Fog Advisory | SHV | 7 hr |
| Jan 31, 6:47 PM CST | Lake Wind Advisory | SHV | 34 hr |
| Feb 1, 3:30 AM CST | Freeze Warning | SHV | 18 hr |
| Feb 1, 3:31 AM CST | Wind Chill Advisory | SHV | 30 hr |
| Feb 1, 6:46 AM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 1, 8:40 AM CST | Tornado Watch | SPC | 6 hr |
| Feb 1, 9:35 PM CST | Hard Freeze Warning | SHV | 11 hr |
| Feb 2, 3:29 PM CST | Hard Freeze Warning | SHV | 16 hr |
| Feb 2, 3:43 PM CST | Winter Storm Watch | SHV | 15 hr |
| Feb 3, 6:46 AM CST | Winter Storm Warning | SHV | 32 hr |
| Feb 3, 12:58 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 3, 10:36 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 4, 5:28 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 6, 8:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 8, 4:18 PM CST | Winter Weather Advisory | SHV | 26 hr |
| Feb 26, 3:18 PM CST | Lake Wind Advisory | SHV | 27 hr |
| Mar 8, 9:52 AM CST | Mesoscale Discussion | SPC | 53 min |
| Mar 8, 12:54 PM CST | Mesoscale Discussion | SPC | 36 min |
| Mar 8, 1:08 PM CST | Tornado Watch | SPC | 9 hr |
| Mar 8, 5:46 PM CST | Mesoscale Discussion | SPC | 59 min |
| Mar 8, 7:37 PM CST | Tornado Watch | SPC | 7 hr |
| Mar 8, 9:40 PM CST | Mesoscale Discussion | SPC | 65 min |
| Mar 8, 11:10 PM CST | Flash Flood Warning | SHV | 4 hr |
| Mar 9, 1:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 9, 6:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 21, 3:30 PM CDT | Lake Wind Advisory | SHV | 27 hr |
| Mar 29, 6:26 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 29, 11:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 2, 4:14 PM CDT | Lake Wind Advisory | SHV | 53 hr |
| Apr 4, 7:44 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 4, 11:20 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 4, 12:17 PM CDT | Severe Thunderstorm Warning | SHV | 43 min |
| Apr 4, 1:24 PM CDT | Severe Thunderstorm Warning | SHV | 51 min |
| Apr 4, 2:11 PM CDT | Severe Thunderstorm Warning | SHV | 49 min |
| Apr 4, 2:39 PM CDT | Tornado Warning | SHV | 36 min |
| Apr 10, 2:50 AM CDT | Lake Wind Advisory | SHV | 16 hr |
| Apr 14, 3:29 PM CDT | Red Flag Warning | SHV | 28 hr |
| Apr 14, 3:38 PM CDT | Lake Wind Advisory | SHV | 28 hr |
| Apr 15, 2:19 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 15, 4:21 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 15, 7:26 AM CDT | Severe Thunderstorm Warning | SHV | 64 min |
| Apr 15, 7:32 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 18, 4:42 AM CDT | Lake Wind Advisory | SHV | 14 hr |
| Apr 25, 3:48 AM CDT | Lake Wind Advisory | SHV | 21 hr |
| Apr 26, 2:12 AM CDT | Severe Thunderstorm Warning | SHV | 48 min |
| Apr 26, 4:03 AM CDT | Lake Wind Advisory | SHV | 27 hr |
| Apr 26, 4:56 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 26, 6:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 8:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Apr 26, 9:33 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 26, 11:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Apr 27, 1:05 AM CDT | Tornado Warning | SHV | 55 min |
| Apr 27, 1:16 AM CDT | Severe Thunderstorm Warning | SHV | 59 min |
| Apr 27, 2:15 AM CDT | Severe Thunderstorm Warning | SHV | 60 min |
| Apr 27, 7:30 AM CDT | Lake Wind Advisory | SHV | 12 hr |
| May 2, 1:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 4:50 AM CDT | Lake Wind Advisory | SHV | 14 hr |
| May 25, 3:16 PM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 7:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| May 25, 8:54 PM CDT | Severe Thunderstorm Warning | SHV | 66 min |
| May 25, 9:43 PM CDT | Tornado Watch | SPC | 5 hr |
| May 25, 10:16 PM CDT | Tornado Warning | SHV | 44 min |
| May 25, 11:06 PM CDT | Severe Thunderstorm Warning | SHV | 39 min |
| Jun 2, 7:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 4, 1:39 PM CDT | Heat Advisory | SHV | 29 hr |
| Jun 4, 6:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 5, 6:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 3:40 PM CDT | Heat Advisory | SHV | 3 days |
| Jun 21, 6:54 AM CDT | Severe Thunderstorm Warning | SHV | 59 min |
| Jun 30, 2:28 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 4, 9:52 PM CDT | Severe Thunderstorm Warning | SHV | 53 min |
| Jul 4, 11:01 PM CDT | Severe Thunderstorm Warning | SHV | 59 min |
| Jul 9, 4:26 AM CDT | Heat Advisory | SHV | 6 days |
| Jul 15, 2:26 PM CDT | Heat Advisory | SHV | 54 hr |
| Jul 30, 3:32 PM CDT | Heat Advisory | SHV | 43 hr |
| Jul 31, 3:47 PM CDT | Excessive Heat Warning | SHV | 6 days |
| Aug 1, 5:21 AM CDT | Heat Advisory | SHV | 10 hr |
| Aug 6, 2:43 PM CDT | Heat Advisory | SHV | 5 days |
| Aug 17, 9:08 AM CDT | Heat Advisory | SHV | 8 days |
| Aug 18, 3:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 22, 2:57 PM CDT | Severe Thunderstorm Warning | SHV | 33 min |
| Aug 23, 4:40 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Aug 24, 12:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 24, 1:17 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 24, 1:49 PM CDT | Severe Thunderstorm Warning | SHV | 56 min |
| Aug 24, 3:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 26, 4:41 AM CDT | Heat Advisory | SHV | 16 hr |
| Sep 3, 5:27 AM CDT | Lake Wind Advisory | SHV | 14 hr |
| Sep 3, 4:07 PM CDT | Flash Flood Watch | SHV | 36 hr |
| Sep 4, 5:30 AM CDT | Lake Wind Advisory | SHV | 38 hr |
| Sep 24, 4:21 PM CDT | Lake Wind Advisory | SHV | 27 hr |
| Sep 28, 5:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 28, 5:50 PM CDT | Severe Thunderstorm Warning | SHV | 55 min |
| Oct 12, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Oct 17, 7:45 PM CDT | Lake Wind Advisory | SHV | 23 hr |
| Oct 18, 2:08 PM CDT | Red Flag Warning | SHV | 29 hr |
| Oct 18, 9:41 PM CDT | Lake Wind Advisory | SHV | 21 hr |
| Nov 2, 8:36 PM CDT | Lake Wind Advisory | SHV | 19 hr |
| Nov 8, 5:09 PM CST | Mesoscale Discussion | SPC | 66 min |
| Nov 8, 5:30 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 8, 8:37 PM CST | Tornado Warning | SHV | 38 min |
| Nov 8, 9:21 PM CST | Mesoscale Discussion | SPC | 84 min |
| Nov 10, 3:27 PM CST | Freeze Warning | SHV | 17 hr |
| Nov 15, 5:44 PM CST | Mesoscale Discussion | SPC | 61 min |
| Nov 15, 5:56 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 28, 3:46 PM CST | Freeze Warning | SHV | 17 hr |
| Dec 29, 8:47 PM CST | Dense Fog Advisory | SHV | 12 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 | 15 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 11 |
| Mesoscale Discussion | 31 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 9 |
| Cold | |
| Freeze Warning | 3 |
| Hard Freeze Warning | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Lake Wind Advisory | 17 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.