Alert archive / Arkansas / Johnson County
Weather alerts in Johnson County, Arkansas, 2010
78 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Johnson County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 78
- Warnings
- 25
- Watches
- 11
- Advisories
- 2
- Busiest month
- May17 alerts
- Busiest day
- April 30, 20105 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Johnson County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 6 | 60% | 3 | 100% | 17 min |
| Flash flood warnings | 10 | 4 | 60% | 2 | 100% | 24 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Little Rock, AR: tornado warnings | 87 | 11 | 87% | 19 | 79% | 25 min |
| NWS Little Rock, AR: severe thunderstorm warnings | 444 | 173 | 61% | 295 | 81% | 19 min |
| NWS Little Rock, AR: flash flood warnings | 138 | 47 | 66% | 71 | 87% | 62 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 19, 10:11 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 20, 6:17 PM CST | Mesoscale Discussion | SPC | 88 min |
| Jan 20, 11:03 PM CST | Mesoscale Discussion | SPC | 87 min |
| Jan 28, 7:11 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 29, 11:41 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 10, 11:39 AM CST | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 10, 3:13 PM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 10, 3:26 PM CST | Tornado Watch | SPC | 7 hr |
| Mar 27, 4:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 27, 4:43 PM CDT | Severe Thunderstorm Warning | LZK | 33 min |
| Apr 2, 9:35 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Apr 30, 1:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 30, 1:46 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 30, 5:44 PM CDT | Severe Thunderstorm Warning | LZK | 46 min |
| Apr 30, 5:53 PM CDT | Mesoscale Discussion | SPC | 37 min |
| Apr 30, 6:24 PM CDT | Tornado Watch | SPC | 3 hr |
| May 1, 7:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 1, 7:53 PM CDT | Severe Thunderstorm Warning | LZK | 52 min |
| May 10, 9:41 PM CDT | Severe Thunderstorm Warning | LZK | 49 min |
| May 10, 9:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| May 10, 10:28 PM CDT | Severe Thunderstorm Warning | LZK | 47 min |
| May 13, 1:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 13, 2:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 13, 2:36 PM CDT | Severe Thunderstorm Warning | LZK | 54 min |
| May 14, 12:05 PM CDT | Severe Thunderstorm Warning | LZK | 40 min |
| May 14, 10:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 16, 12:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 16, 1:28 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 16, 6:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 19, 7:32 PM CDT | Tornado Watch | SPC | 6 hr |
| May 19, 11:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 20, 12:22 AM CDT | Flash Flood Warning | LZK | 6 hr |
| May 20, 2:17 PM CDT | River Flood Advisory | LZK | 19 hr |
| Jun 16, 7:03 PM CDT | Severe Thunderstorm Warning | LZK | 27 min |
| Jun 19, 5:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 24, 4:22 PM CDT | Severe Thunderstorm Warning | LZK | 38 min |
| Jul 11, 1:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 11, 7:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 12, 2:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 13, 1:08 AM CDT | Flash Flood Warning | LZK | 3 hr |
| Jul 13, 1:23 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 15, 4:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 16, 1:58 PM CDT | Flash Flood Warning | LZK | 107 min |
| Jul 16, 3:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 17, 3:12 PM CDT | Special Weather Statement | LZK | 38 min |
| Aug 1, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 3:06 PM CDT | Severe Thunderstorm Warning | LZK | 39 min |
| Aug 5, 3:28 PM CDT | Severe Thunderstorm Warning | LZK | 34 min |
| Aug 8, 3:40 AM CDT | Flash Flood Warning | LZK | 3 hr |
| Aug 21, 6:09 PM CDT | Severe Thunderstorm Warning | LZK | 36 min |
| Aug 30, 5:05 PM CDT | Special Weather Statement | LZK | 85 min |
| Sep 1, 2:19 PM CDT | Special Weather Statement | LZK | 31 min |
| Sep 7, 11:54 AM CDT | Flash Flood Warning | LZK | 3 hr |
| Sep 7, 2:51 PM CDT | Flash Flood Warning | LZK | 2 hr |
| Sep 9, 5:39 AM CDT | Flash Flood Warning | LZK | 5 hr |
| Sep 9, 10:28 AM CDT | River Flood Advisory | LZK | 3 days |
| Sep 9, 11:09 AM CDT | Flash Flood Warning | LZK | 111 min |
| Sep 9, 3:07 PM CDT | Flash Flood Warning | LZK | 113 min |
| Sep 9, 5:50 PM CDT | Flash Flood Warning | LZK | 4 hr |
| Oct 25, 10:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Oct 26, 2:07 AM CDT | Special Weather Statement | LZK | 63 min |
| Oct 26, 3:00 AM CDT | Severe Thunderstorm Warning | LZK | 45 min |
| Nov 22, 3:19 PM CST | Mesoscale Discussion | SPC | 86 min |
| Nov 22, 7:09 PM CST | Mesoscale Discussion | SPC | 66 min |
| Nov 22, 7:57 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 22, 10:27 PM CST | Special Weather Statement | LZK | 58 min |
| Nov 22, 11:37 PM CST | Special Weather Statement | LZK | 43 min |
| Nov 22, 11:44 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 24, 6:42 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 24, 11:51 PM CST | Mesoscale Discussion | SPC | 114 min |
| Nov 25, 2:34 AM CST | Mesoscale Discussion | SPC | 56 min |
| Nov 25, 7:50 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 31, 5:45 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | 8 hr |
| Dec 31, 8:59 AM CST | Severe Thunderstorm Warning | LZK | 46 min |
| Dec 31, 9:18 AM CST | Special Weather Statement | LZK | 47 min |
| Dec 31, 9:41 AM CST | Severe Thunderstorm Warning | LZK | 49 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 | 15 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 33 |
| Special Weather Statement | 7 |
| Flooding | |
| Flash Flood Warning | 10 |
| River Flood Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.