Alert archive / Arkansas / Nevada County
Weather alerts in Nevada County, Arkansas, 2020
118 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 118
- Warnings
- 31
- Watches
- 20
- Advisories
- 22
- Busiest month
- April22 alerts
- Busiest day
- May 16, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 2 tornado warnings covering Nevada County in 2020 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 37 minutes after it went out.
Nevada County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 37 min |
| Severe thunderstorm warnings | 17 | 13 | 24% | 6 | 50% | 21 min |
| Flash flood warnings | 6 | 4 | 33% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Shreveport, LA: tornado warnings | 77 | 29 | 62% | 67 | 63% | 14 min |
| NWS Shreveport, LA: severe thunderstorm warnings | 252 | 186 | 26% | 540 | 79% | 24 min |
| NWS Shreveport, LA: flash flood warnings | 55 | 37 | 33% | 117 | 90% | 105 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 9, 4:11 AM CST | Flash Flood Watch | SHV | 49 hr |
| Jan 9, 8:39 PM CST | Lake Wind Advisory | SHV | 32 hr |
| Jan 10, 4:55 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 5:34 PM CST | Tornado Watch | SPC | 11 hr |
| Jan 10, 7:30 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 10:40 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 11:05 PM CST | Special Weather Statement | SHV | 55 min |
| Jan 14, 8:35 PM CST | Dense Fog Advisory | SHV | 12 hr |
| Jan 21, 1:21 PM CST | Winter Weather Advisory | SHV | 26 hr |
| Jan 26, 11:10 PM CST | Dense Fog Advisory | SHV | 11 hr |
| Feb 9, 3:56 PM CST | Flash Flood Watch | SHV | 71 hr |
| Feb 9, 9:59 PM CST | Severe Thunderstorm Warning | SHV | 31 min |
| Feb 9, 11:41 PM CST | Severe Thunderstorm Warning | SHV | 28 min |
| Feb 10, 4:11 PM CST | Special Weather Statement | SHV | 49 min |
| Feb 12, 7:38 AM CST | Flash Flood Warning | SHV | 3 hr |
| Feb 23, 1:30 PM CST | Lake Wind Advisory | SHV | 29 hr |
| Mar 2, 10:09 PM CST | Special Weather Statement | SHV | 51 min |
| Mar 12, 3:44 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 12, 9:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Mar 17, 3:07 AM CDT | Dense Fog Advisory | SHV | 7 hr |
| Mar 19, 2:24 PM CDT | Tornado Watch | SPC | 8 hr |
| Mar 28, 12:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 12, 2:45 AM CDT | Lake Wind Advisory | SHV | 21 hr |
| Apr 12, 4:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 12, 5:59 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 12, 6:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 12, 7:10 PM CDT | Severe Thunderstorm Warning | SHV | 65 min |
| Apr 12, 7:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 18, 8:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 11:19 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 22, 2:01 AM CDT | Special Weather Statement | SHV | 59 min |
| Apr 22, 4:37 AM CDT | Special Weather Statement | SHV | 38 min |
| Apr 22, 4:46 AM CDT | Special Weather Statement | SHV | 44 min |
| Apr 22, 12:19 PM CDT | Special Weather Statement | SHV | 26 min |
| Apr 22, 6:39 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Apr 22, 9:22 PM CDT | Severe Thunderstorm Warning | SHV | 38 min |
| Apr 22, 10:00 PM CDT | Severe Thunderstorm Warning | SHV | 30 min |
| Apr 24, 4:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 24, 7:19 PM CDT | Mesoscale Discussion | SPC | 101 min |
| Apr 24, 8:47 PM CDT | Severe Thunderstorm Warning | SHV | 43 min |
| Apr 28, 10:48 AM CDT | Special Weather Statement | SHV | 27 min |
| Apr 28, 8:25 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Apr 28, 11:22 PM CDT | Severe Thunderstorm Warning | SHV | 53 min |
| Apr 29, 3:21 PM CDT | Lake Wind Advisory | SHV | 4 hr |
| May 5, 6:45 AM CDT | Special Weather Statement | SHV | 60 min |
| May 5, 7:45 AM CDT | Special Weather Statement | SHV | 45 min |
| May 8, 1:12 AM CDT | Lake Wind Advisory | SHV | 18 hr |
| May 8, 3:06 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 8, 4:37 AM CDT | Severe Thunderstorm Warning | SHV | 38 min |
| May 8, 5:14 AM CDT | Severe Thunderstorm Warning | SHV | 46 min |
| May 16, 1:16 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 3:27 PM CDT | Tornado Watch | SPC | 6 hr |
| May 16, 4:37 PM CDT | Flash Flood Watch | SHV | 14 hr |
| May 16, 5:19 PM CDT | Tornado Warning | SHV | 41 min |
| May 16, 5:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 16, 5:58 PM CDT | Tornado Warning | SHV | 47 min |
| May 16, 6:48 PM CDT | Flash Flood Warning | SHV | 117 min |
| May 17, 11:03 AM CDT | River Flood Warning | LZK | 23 hr |
| May 21, 6:25 PM CDT | Severe Thunderstorm Warning | SHV | 50 min |
| May 22, 7:34 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 23, 5:02 AM CDT | Special Weather Statement | SHV | 43 min |
| May 23, 5:44 AM CDT | Special Weather Statement | SHV | 46 min |
| May 25, 2:45 AM CDT | Flash Flood Watch | SHV | 36 hr |
| May 25, 5:47 PM CDT | Severe Thunderstorm Warning | SHV | 43 min |
| Jun 4, 12:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 6, 12:10 AM CDT | Special Weather Statement | SHV | 65 min |
| Jun 6, 12:32 AM CDT | Severe Thunderstorm Warning | SHV | 58 min |
| Jun 9, 8:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 9, 8:59 PM CDT | Special Weather Statement | SHV | 46 min |
| Jun 9, 9:47 PM CDT | Special Weather Statement | SHV | 43 min |
| Jun 21, 8:45 PM CDT | Severe Thunderstorm Warning | SHV | 60 min |
| Jun 21, 9:41 PM CDT | Severe Thunderstorm Warning | SHV | 64 min |
| Jun 21, 10:43 PM CDT | Flash Flood Warning | SHV | 7 hr |
| Jun 21, 11:13 PM CDT | Severe Thunderstorm Warning | SHV | 62 min |
| Jun 22, 12:29 AM CDT | Flash Flood Warning | SHV | 5 hr |
| Jun 22, 2:12 AM CDT | Special Weather Statement | SHV | 48 min |
| Jun 23, 9:26 AM CDT | Special Weather Statement | SHV | 64 min |
| Jun 26, 4:39 PM CDT | Special Weather Statement | SHV | 51 min |
| Jun 28, 5:56 PM CDT | Special Weather Statement | SHV | 49 min |
| Jun 30, 1:26 PM CDT | Heat Advisory | SHV | 54 hr |
| Jul 6, 1:47 PM CDT | Flash Flood Warning | SHV | 3 hr |
| Jul 9, 10:46 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 10, 4:47 AM CDT | Heat Advisory | SHV | 5 days |
| Jul 14, 2:09 PM CDT | Heat Advisory | SHV | 53 hr |
| Jul 30, 3:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 8:36 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 30, 10:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 30, 11:14 PM CDT | Special Weather Statement | SHV | 46 min |
| Aug 12, 4:16 AM CDT | Flood Watch | SHV | 9 hr |
| Aug 12, 5:28 AM CDT | Special Weather Statement | SHV | 47 min |
| Aug 12, 5:44 AM CDT | Areal Flood Advisory | SHV | 3 hr |
| Aug 12, 6:31 AM CDT | Flash Flood Warning | SHV | 5 hr |
| Aug 14, 3:02 AM CDT | Heat Advisory | SHV | 64 hr |
| Aug 25, 2:49 PM CDT | Flash Flood Watch | SHV | 60 hr |
| Aug 25, 9:52 PM CDT | Tropical Storm Warning | SHV | 45 hr |
| Aug 26, 10:14 AM CDT | River Flood Warning | LZK | 35 hr |
| Aug 27, 7:47 AM CDT | Tornado Watch | SPC | 8 hr |
| Aug 27, 3:02 PM CDT | Heat Advisory | SHV | 52 hr |
| Aug 29, 11:45 AM CDT | Excessive Heat Warning | SHV | 7 hr |
| Aug 29, 3:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 29, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 29, 10:19 PM CDT | Severe Thunderstorm Warning | SHV | 56 min |
| Aug 29, 10:52 PM CDT | Severe Thunderstorm Warning | SHV | 53 min |
| Aug 29, 11:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Aug 31, 1:39 PM CDT | Flash Flood Watch | SHV | 61 hr |
| Sep 10, 3:27 PM CDT | Areal Flood Advisory | SHV | 3 hr |
| Sep 26, 5:04 AM CDT | Dense Fog Advisory | SHV | 5 hr |
| Sep 28, 1:43 AM CDT | Lake Wind Advisory | SHV | 17 hr |
| Oct 29, 3:03 AM CDT | Lake Wind Advisory | SHV | 15 hr |
| Nov 21, 1:26 AM CST | Dense Fog Advisory | SHV | 8 hr |
| Nov 25, 12:15 AM CST | Special Weather Statement | SHV | 60 min |
| Nov 29, 2:11 PM CST | Freeze Warning | SHV | 19 hr |
| Nov 30, 1:47 PM CST | Freeze Warning | SHV | 19 hr |
| Dec 19, 9:38 PM CST | Dense Fog Advisory | SHV | 11 hr |
| Dec 23, 3:07 AM CST | Lake Wind Advisory | SHV | 38 hr |
| Dec 23, 3:46 PM CST | Mesoscale Discussion | SPC | 89 min |
| Dec 23, 4:11 PM CST | Special Weather Statement | SHV | 64 min |
| Dec 30, 3:12 AM CST | Flash Flood Watch | SHV | 45 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 | 17 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 23 |
| Flooding | |
| Flash Flood Warning | 6 |
| River Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 2 |
| Wind and dust | |
| Lake Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Tropical | |
| Tropical Storm Warning | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.