Alert archive / Arkansas / Nevada County
Weather alerts in Nevada County, Arkansas, 2011
195 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Nevada County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 195
- Warnings
- 51
- Watches
- 35
- Advisories
- 36
- Busiest month
- April67 alerts
- Busiest day
- April 25, 201112 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Nevada County in 2011 had a tornado report inside them.
Nevada County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 0 | ||
| Severe thunderstorm warnings | 29 | 17 | 41% | 13 | 62% | 33 min |
| Flash flood warnings | 3 | 2 | 33% | 1 | 100% | 117 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 8, 3:25 PM CST | Winter Storm Warning | SHV | 33 hr |
| Jan 9, 7:09 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 9, 10:55 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 11, 4:05 AM CST | Hard Freeze Warning | SHV | 29 hr |
| Jan 12, 3:31 PM CST | Hard Freeze Warning | SHV | 17 hr |
| Jan 17, 11:19 PM CST | Dense Fog Advisory | SHV | 11 hr |
| Jan 31, 4:37 PM CST | Winter Weather Advisory | SHV | 28 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, 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 | Wind Chill Advisory | SHV | 17 hr |
| Feb 3, 6:46 AM CST | Winter Storm Warning | SHV | 32 hr |
| Feb 4, 2:34 AM CST | Winter Weather Advisory | SHV | 12 hr |
| Feb 4, 5:28 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 7, 3:40 PM CST | Winter Storm Watch | SHV | 25 hr |
| Feb 8, 4:18 PM CST | Winter Storm Warning | SHV | 21 hr |
| Feb 8, 4:18 PM CST | Winter Weather Advisory | SHV | 26 hr |
| Feb 9, 10:03 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 9, 3:56 PM CST | Hard Freeze Warning | SHV | 17 hr |
| Feb 10, 3:43 PM CST | Hard Freeze Warning | SHV | 17 hr |
| Feb 24, 11:25 AM CST | Tornado Watch | SPC | 9 hr |
| Feb 24, 2:39 PM CST | Mesoscale Discussion | SPC | 66 min |
| Feb 24, 5:26 PM CST | Mesoscale Discussion | SPC | 94 min |
| Feb 26, 3:18 PM CST | Lake Wind Advisory | SHV | 27 hr |
| Feb 27, 10:04 PM CST | Tornado Watch | SPC | 6 hr |
| Feb 27, 11:49 PM CST | Mesoscale Discussion | SPC | 86 min |
| Mar 8, 7:30 AM CST | Mesoscale Discussion | SPC | 90 min |
| Mar 8, 6:27 PM CST | Mesoscale Discussion | SPC | 63 min |
| Mar 8, 7:37 PM CST | Tornado Watch | SPC | 7 hr |
| Mar 21, 3:30 PM CDT | Lake Wind Advisory | SHV | 27 hr |
| Mar 25, 3:43 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 25, 7:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Mar 25, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 26, 2:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 26, 2:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Mar 27, 1:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Mar 27, 7:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 2, 4:14 PM CDT | Lake Wind Advisory | SHV | 53 hr |
| Apr 4, 3:00 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 4, 3:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 4, 5:48 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Apr 4, 7:44 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 4, 8:42 AM CDT | Tornado Warning | SHV | 48 min |
| Apr 10, 2:50 AM CDT | Lake Wind Advisory | SHV | 16 hr |
| Apr 11, 1:49 AM CDT | Tornado Watch | SPC | 4 hr |
| Apr 11, 4:19 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 14, 3:38 PM CDT | Lake Wind Advisory | SHV | 28 hr |
| Apr 14, 7:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Apr 14, 9:06 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 14, 11:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Apr 15, 1:14 AM CDT | Severe Thunderstorm Warning | SHV | 61 min |
| Apr 15, 1:27 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 16, 4:47 AM CDT | Lake Wind Advisory | SHV | 11 hr |
| Apr 19, 4:15 AM CDT | Lake Wind Advisory | SHV | 15 hr |
| Apr 19, 2:16 PM CDT | Tornado Watch | SPC | 10 hr |
| Apr 19, 9:00 PM CDT | Severe Thunderstorm Warning | SHV | 45 min |
| Apr 19, 11:17 PM CDT | Severe Thunderstorm Warning | SHV | 58 min |
| Apr 19, 11:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Apr 19, 11:43 PM CDT | Severe Thunderstorm Warning | SHV | 62 min |
| Apr 19, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 20, 12:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Apr 20, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 20, 5:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 20, 8:33 PM CDT | Severe Thunderstorm Warning | SHV | 57 min |
| Apr 20, 10:00 PM CDT | Severe Thunderstorm Warning | SHV | 60 min |
| Apr 21, 12:24 AM CDT | Severe Thunderstorm Warning | SHV | 66 min |
| Apr 21, 1:14 AM CDT | Severe Thunderstorm Warning | SHV | 61 min |
| Apr 21, 3:38 AM CDT | Flash Flood Warning | SHV | 4 hr |
| Apr 21, 7:16 AM CDT | Flash Flood Warning | SHV | 4 hr |
| Apr 22, 3:55 AM CDT | Lake Wind Advisory | SHV | 14 hr |
| Apr 24, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 25, 1:24 AM CDT | Severe Thunderstorm Warning | SHV | 66 min |
| Apr 25, 3:48 AM CDT | Lake Wind Advisory | SHV | 21 hr |
| Apr 25, 4:41 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 25, 7:23 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Apr 25, 8:47 AM CDT | Severe Thunderstorm Warning | SHV | 43 min |
| Apr 25, 9:05 AM CDT | Tornado Warning | SHV | 25 min |
| Apr 25, 9:26 AM CDT | Tornado Warning | SHV | 19 min |
| Apr 25, 11:00 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 25, 3:22 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 25, 3:49 PM CDT | Flash Flood Watch | SHV | 39 hr |
| Apr 25, 6:06 PM CDT | Severe Thunderstorm Warning | SHV | 39 min |
| Apr 25, 7:19 PM CDT | Severe Thunderstorm Warning | SHV | 41 min |
| Apr 25, 7:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 25, 7:49 PM CDT | Severe Thunderstorm Warning | SHV | 56 min |
| Apr 25, 10:41 PM CDT | River Flood Advisory | LZK | 36 hr |
| Apr 26, 1:07 AM CDT | Severe Thunderstorm Warning | SHV | 23 min |
| Apr 26, 1:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 1:44 PM CDT | Tornado Watch | SPC | 10 hr |
| Apr 26, 3:11 PM CDT | Severe Thunderstorm Warning | SHV | 49 min |
| Apr 26, 3:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 26, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Apr 26, 6:40 PM CDT | Severe Thunderstorm Warning | SHV | 50 min |
| Apr 26, 6:46 PM CDT | Tornado Warning | SHV | 14 min |
| Apr 26, 8:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Apr 27, 1:19 AM CDT | River Flood Warning | LZK | 45 hr |
| Apr 27, 4:41 AM CDT | Severe Thunderstorm Warning | SHV | 64 min |
| Apr 27, 4:53 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 27, 5:02 AM CDT | Severe Thunderstorm Warning | SHV | 58 min |
| Apr 27, 5:50 AM CDT | Severe Thunderstorm Warning | SHV | 55 min |
| Apr 27, 6:08 AM CDT | Flash Flood Warning | SHV | 4 hr |
| Apr 27, 7:30 AM CDT | Lake Wind Advisory | SHV | 12 hr |
| Apr 27, 9:48 AM CDT | Mesoscale Discussion | SPC | 27 min |
| Apr 30, 5:17 AM CDT | Flash Flood Watch | SHV | 65 hr |
| Apr 30, 11:39 PM CDT | Mesoscale Discussion | SPC | 66 min |
| May 1, 1:16 AM CDT | Mesoscale Discussion | SPC | 59 min |
| May 1, 7:44 AM CDT | River Flood Warning | LZK | 50 hr |
| May 1, 8:30 AM CDT | Mesoscale Discussion | SPC | 30 min |
| May 1, 8:45 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 1, 12:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 1, 12:47 PM CDT | Tornado Watch | SPC | 8 hr |
| May 1, 3:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 1, 5:42 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 1, 5:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 1, 8:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| May 11, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 11, 7:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 20, 9:33 AM CDT | Severe Thunderstorm Warning | SHV | 42 min |
| May 20, 10:30 AM CDT | Mesoscale Discussion | SPC | 60 min |
| May 20, 11:03 AM CDT | Tornado Watch | SPC | 7 hr |
| May 20, 1:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 20, 4:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| May 20, 5:56 PM CDT | Tornado Watch | SPC | 3 hr |
| May 20, 9:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| May 21, 7:30 PM CDT | Severe Thunderstorm Warning | SHV | 45 min |
| May 21, 8:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 22, 5:18 AM CDT | Mesoscale Discussion | SPC | 57 min |
| May 22, 11:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 24, 2:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| May 24, 8:05 PM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 4:50 AM CDT | Lake Wind Advisory | SHV | 14 hr |
| May 25, 1:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 3:16 PM CDT | Tornado Watch | SPC | 7 hr |
| May 28, 3:33 AM CDT | Lake Wind Advisory | SHV | 15 hr |
| Jun 5, 12:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 5, 4:32 PM CDT | Severe Thunderstorm Warning | SHV | 58 min |
| Jun 15, 1:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 16, 3:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 17, 3:40 PM CDT | Heat Advisory | SHV | 3 days |
| Jun 28, 11:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 28, 11:51 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 28, 6:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 30, 12:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 12:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 5, 4:45 PM CDT | Severe Thunderstorm Warning | SHV | 45 min |
| Jul 5, 5:31 PM CDT | Severe Thunderstorm Warning | SHV | 59 min |
| Jul 9, 4:26 AM CDT | Heat Advisory | SHV | 6 days |
| Jul 13, 1:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 15, 2:26 PM CDT | Heat Advisory | SHV | 54 hr |
| Jul 24, 5:13 AM CDT | Heat Advisory | SHV | 4 days |
| Jul 25, 3:09 PM CDT | Severe Thunderstorm Warning | SHV | 51 min |
| 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 7, 1:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 17, 9:08 AM CDT | Heat Advisory | SHV | 8 days |
| Aug 20, 3:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Aug 23, 3:04 PM CDT | Severe Thunderstorm Warning | SHV | 41 min |
| Aug 24, 11:46 AM CDT | Severe Thunderstorm Warning | SHV | 37 min |
| Sep 4, 5:30 AM CDT | Lake Wind Advisory | SHV | 38 hr |
| Sep 4, 11:31 PM CDT | Red Flag Warning | SHV | 20 hr |
| Sep 18, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 18, 9:48 PM CDT | Severe Thunderstorm Warning | SHV | 57 min |
| Sep 18, 10:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Sep 22, 3:44 PM CDT | Severe Thunderstorm Warning | SHV | 20 min |
| Sep 27, 1:36 AM CDT | Mesoscale Discussion | SPC | 114 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 |
| Oct 24, 3:37 AM CDT | Dense Fog Advisory | SHV | 6 hr |
| Nov 2, 8:36 PM CDT | Lake Wind Advisory | SHV | 19 hr |
| Nov 8, 10:31 AM CST | Mesoscale Discussion | SPC | 29 min |
| Nov 8, 10:49 AM CST | Tornado Watch | SPC | 7 hr |
| Nov 8, 1:03 PM CST | Mesoscale Discussion | SPC | 57 min |
| Nov 8, 3:48 PM CST | Mesoscale Discussion | SPC | 87 min |
| Nov 8, 5:09 PM CST | Mesoscale Discussion | SPC | 66 min |
| Nov 8, 5:30 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 11, 3:25 PM CST | Lake Wind Advisory | SHV | 27 hr |
| Nov 13, 4:54 AM CST | Lake Wind Advisory | SHV | 13 hr |
| Nov 15, 3:49 PM CST | Mesoscale Discussion | SPC | 116 min |
| Nov 20, 12:12 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Nov 20, 3:38 PM CST | Severe Thunderstorm Watch | SPC | 7 hr |
| Nov 20, 5:25 PM CST | Mesoscale Discussion | SPC | 95 min |
| Nov 21, 8:16 PM CST | Mesoscale Discussion | SPC | 89 min |
| Nov 21, 8:36 PM CST | Tornado Watch | SPC | 5 hr |
| Nov 21, 10:45 PM CST | Mesoscale Discussion | SPC | 90 min |
| Nov 22, 1:46 AM CST | Mesoscale Discussion | SPC | 59 min |
| Nov 25, 2:34 AM CST | Dense Fog Advisory | SHV | 6 hr |
| Dec 4, 4:56 AM CST | Flash Flood Watch | SHV | 30 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 | 29 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 13 |
| Tornado Watch | 17 |
| Mesoscale Discussion | 73 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 2 |
| Flash Flood Watch | 3 |
| River Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 3 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 1 |
| Hard Freeze Warning | 6 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Lake Wind Advisory | 19 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
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.