Alert archive / Oklahoma / Seminole County
Weather alerts in Seminole County, Oklahoma, 2020
145 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Seminole County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 145
- Warnings
- 37
- Watches
- 18
- Advisories
- 37
- Busiest month
- May28 alerts
- Busiest day
- September 1, 202010 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Seminole County in 2020 had a tornado report inside them.
Seminole County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 26 | 13 | 50% | 6 | 50% | 26 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Norman, OK: tornado warnings | 34 | 9 | 74% | 16 | 75% | 13 min |
| NWS Norman, OK: severe thunderstorm warnings | 742 | 300 | 60% | 846 | 87% | 24 min |
| NWS Norman, OK: flash flood warnings | 55 | 22 | 60% | 37 | 86% | 40 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 10, 3:50 AM CST | Winter Weather Advisory | OUN | 31 hr |
| Jan 10, 9:12 AM CST | Mesoscale Discussion | SPC | 93 min |
| Jan 10, 10:42 AM CST | Tornado Watch | SPC | 10 hr |
| Jan 13, 7:54 AM CST | Dense Fog Advisory | OUN | 2 hr |
| Jan 13, 10:12 AM CST | Dense Fog Advisory | OUN | 108 min |
| Jan 13, 7:02 PM CST | Dense Fog Advisory | OUN | 16 hr |
| Jan 22, 6:00 PM CST | Dense Fog Advisory | OUN | 11 hr |
| Feb 3, 3:21 AM CST | Winter Storm Watch | OUN | 32 hr |
| Feb 4, 4:46 AM CST | Winter Storm Warning | OUN | 39 hr |
| Feb 5, 2:02 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 16, 8:44 PM CST | Dense Fog Advisory | OUN | 14 hr |
| Mar 18, 7:20 AM CDT | River Flood Warning | OUN | 103 min |
| Mar 18, 10:05 AM CDT | Flood Watch | OUN | 32 hr |
| Mar 19, 3:23 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 19, 7:40 AM CDT | River Flood Warning | OUN | 19 hr |
| Mar 19, 7:41 AM CDT | Areal Flood Advisory | OUN | 3 hr |
| Mar 19, 9:03 AM CDT | Severe Thunderstorm Warning | OUN | 42 min |
| Mar 19, 9:45 AM CDT | Severe Thunderstorm Warning | OUN | 33 min |
| Mar 23, 1:53 AM CDT | Dense Fog Advisory | OUN | 9 hr |
| Mar 28, 4:56 AM CDT | Special Weather Statement | OUN | 34 min |
| Mar 28, 6:01 AM CDT | Special Weather Statement | OUN | 29 min |
| Apr 11, 2:09 PM CDT | Wind Advisory | OUN | 32 hr |
| Apr 11, 8:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 11, 10:57 PM CDT | Special Weather Statement | OUN | 63 min |
| Apr 12, 1:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 12, 3:57 PM CDT | Special Weather Statement | OUN | 33 min |
| Apr 14, 2:09 PM CDT | Freeze Warning | OUN | 19 hr |
| Apr 20, 1:06 AM CDT | Dense Fog Advisory | OUN | 11 hr |
| Apr 21, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 21, 9:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 21, 11:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 22, 2:06 AM CDT | River Flood Warning | OUN | 25 hr |
| Apr 22, 8:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 22, 8:53 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 22, 10:24 AM CDT | Severe Thunderstorm Warning | OUN | 51 min |
| Apr 22, 5:11 PM CDT | Special Weather Statement | OUN | 49 min |
| Apr 22, 5:27 PM CDT | Special Weather Statement | OUN | 33 min |
| Apr 24, 3:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 24, 5:51 PM CDT | Severe Thunderstorm Warning | OUN | 39 min |
| Apr 28, 1:55 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 28, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 28, 7:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 28, 7:19 PM CDT | Severe Thunderstorm Warning | OUN | 41 min |
| Apr 28, 7:31 PM CDT | Severe Thunderstorm Warning | OUN | 44 min |
| Apr 28, 7:47 PM CDT | Severe Thunderstorm Warning | OUN | 43 min |
| Apr 28, 7:57 PM CDT | Severe Thunderstorm Warning | OUN | 33 min |
| Apr 28, 8:11 PM CDT | Severe Thunderstorm Warning | OUN | 34 min |
| Apr 28, 8:29 PM CDT | Severe Thunderstorm Warning | OUN | 46 min |
| May 4, 2:32 PM CDT | Tornado Watch | SPC | 9 hr |
| May 4, 3:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 4, 5:36 PM CDT | Severe Thunderstorm Warning | OUN | 39 min |
| May 4, 6:08 PM CDT | Severe Thunderstorm Warning | OUN | 52 min |
| May 4, 6:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 6:51 PM CDT | Severe Thunderstorm Warning | OUN | 24 min |
| May 7, 11:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 7, 11:25 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 8, 12:15 AM CDT | Special Weather Statement | OUN | 45 min |
| May 8, 1:22 AM CDT | Mesoscale Discussion | SPC | 113 min |
| May 8, 1:31 AM CDT | Severe Thunderstorm Warning | OUN | 44 min |
| May 8, 1:58 AM CDT | Severe Thunderstorm Warning | OUN | 62 min |
| May 12, 8:46 PM CDT | Dense Fog Advisory | OUN | 13 hr |
| May 14, 2:45 AM CDT | Special Weather Statement | OUN | 30 min |
| May 15, 10:59 AM CDT | Flood Watch | OUN | 16 hr |
| May 15, 11:04 AM CDT | Mesoscale Discussion | SPC | 86 min |
| May 15, 12:57 PM CDT | Areal Flood Advisory | OUN | 3 hr |
| May 15, 4:15 PM CDT | River Flood Warning | OUN | 11 hr |
| May 15, 5:23 PM CDT | Areal Flood Advisory | OUN | 2 hr |
| May 22, 5:01 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 22, 5:07 AM CDT | Severe Thunderstorm Warning | OUN | 38 min |
| May 22, 5:39 AM CDT | Severe Thunderstorm Warning | OUN | 51 min |
| May 22, 6:24 AM CDT | Severe Thunderstorm Warning | OUN | 51 min |
| May 22, 6:41 AM CDT | Severe Thunderstorm Warning | OUN | 49 min |
| May 22, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 22, 9:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 1:59 AM CDT | Special Weather Statement | OUN | 46 min |
| May 24, 2:47 AM CDT | Special Weather Statement | OUN | 43 min |
| Jun 5, 12:32 PM CDT | Heat Advisory | OUN | 6 hr |
| Jun 6, 10:50 AM CDT | Heat Advisory | OUN | 8 hr |
| Jun 21, 5:50 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 22, 12:42 AM CDT | Mesoscale Discussion | SPC | 33 min |
| Jun 22, 12:48 AM CDT | Special Weather Statement | OUN | 57 min |
| Jun 22, 1:27 AM CDT | Special Weather Statement | OUN | 63 min |
| Jun 29, 4:40 PM CDT | Heat Advisory | OUN | 3 days |
| Jul 2, 2:29 PM CDT | Special Weather Statement | OUN | 46 min |
| Jul 2, 3:15 PM CDT | Special Weather Statement | OUN | 45 min |
| Jul 3, 2:26 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 3, 3:27 PM CDT | Special Weather Statement | OUN | 48 min |
| Jul 5, 7:28 AM CDT | Dense Fog Advisory | OUN | 115 min |
| Jul 8, 2:57 PM CDT | Heat Advisory | OUN | 70 hr |
| Jul 10, 9:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 10, 11:30 AM CDT | Severe Thunderstorm Warning | OUN | 45 min |
| Jul 10, 1:14 PM CDT | Heat Advisory | OUN | 3 days |
| Jul 11, 11:40 AM CDT | Excessive Heat Warning | OUN | 9 hr |
| Jul 11, 10:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 11, 11:36 PM CDT | Special Weather Statement | OUN | 39 min |
| Jul 12, 12:06 AM CDT | Severe Thunderstorm Warning | OUN | 39 min |
| Jul 12, 12:41 AM CDT | Severe Thunderstorm Warning | OUN | 49 min |
| Jul 12, 12:42 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 12, 1:17 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 12, 1:20 AM CDT | Severe Thunderstorm Warning | OUN | 55 min |
| Jul 13, 6:15 AM CDT | Special Weather Statement | OUN | 60 min |
| Jul 14, 12:42 AM CDT | Heat Advisory | OUN | 19 hr |
| Jul 16, 8:38 AM CDT | Heat Advisory | OUN | 11 hr |
| Jul 16, 8:19 PM CDT | Heat Advisory | OUN | 24 hr |
| Jul 27, 4:42 AM CDT | Flood Watch | OUN | 57 hr |
| Jul 27, 4:21 PM CDT | Special Weather Statement | OUN | 24 min |
| Jul 30, 3:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 30, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 5, 1:43 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 11, 12:36 AM CDT | Special Weather Statement | OUN | 54 min |
| Aug 12, 3:10 AM CDT | Heat Advisory | OUN | 64 hr |
| Aug 14, 2:52 AM CDT | Heat Advisory | OUN | 40 hr |
| Aug 16, 11:36 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 16, 12:18 PM CDT | Heat Advisory | OUN | 7 hr |
| Aug 28, 2:28 PM CDT | Heat Advisory | OUN | 30 hr |
| Aug 29, 5:07 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 2:36 PM CDT | Flood Watch | OUN | 55 hr |
| Aug 31, 3:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 31, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Aug 31, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | 49 min |
| Aug 31, 10:45 PM CDT | Special Weather Statement | OUN | 30 min |
| Aug 31, 11:09 PM CDT | Severe Thunderstorm Warning | OUN | 30 min |
| Aug 31, 11:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Sep 1, 12:14 AM CDT | Severe Thunderstorm Warning | OUN | 31 min |
| Sep 1, 12:38 AM CDT | Tornado Warning | OUN | 37 min |
| Sep 1, 12:57 AM CDT | Areal Flood Advisory | OUN | 3 hr |
| Sep 1, 4:11 AM CDT | River Flood Advisory | OUN | 3 hr |
| Sep 1, 5:55 AM CDT | Flash Flood Warning | OUN | 3 hr |
| Sep 1, 11:18 AM CDT | River Flood Warning | OUN | 15 hr |
| Sep 11, 10:16 PM CDT | Dense Fog Advisory | OUN | 12 hr |
| Sep 27, 11:29 AM CDT | Wind Advisory | OUN | 14 hr |
| Sep 27, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 10, 3:28 AM CDT | Dense Fog Advisory | OUN | 7 hr |
| Oct 25, 4:06 AM CDT | Winter Weather Advisory | OUN | 62 hr |
| Oct 29, 1:31 PM CDT | Freeze Warning | OUN | 19 hr |
| Nov 14, 7:04 PM CST | Wind Advisory | OUN | 3 hr |
| Nov 24, 1:50 PM CST | Severe Thunderstorm Watch | SPC | 6 hr |
| Nov 24, 5:17 PM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 24, 7:01 PM CST | Special Weather Statement | OUN | 29 min |
| Nov 24, 7:25 PM CST | Special Weather Statement | OUN | 35 min |
| Dec 11, 12:51 PM CST | Winter Weather Advisory | OUN | 53 hr |
| Dec 14, 3:53 AM CST | Winter Weather Advisory | OUN | 41 hr |
| Dec 23, 2:43 AM CST | Wind Advisory | OUN | 15 hr |
| Dec 30, 10:34 AM CST | Winter Weather Advisory | OUN | 4 hr |
| Dec 31, 2:59 PM CST | Mesoscale Discussion | SPC | 4 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 | 26 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 22 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 5 |
| Flood Watch | 4 |
| Areal Flood Advisory | 4 |
| River Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 12 |
| Cold | |
| Freeze Warning | 2 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
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.