Alert archive / Oklahoma / Seminole County
Weather alerts in Seminole County, Oklahoma, 2009
167 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 167
- Warnings
- 49
- Watches
- 41
- Advisories
- 19
- Busiest month
- May31 alerts
- Busiest day
- September 21, 20097 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Seminole County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 30 | 10 | 67% | 1 | 100% | 52 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Norman, OK: tornado warnings | 42 | 12 | 71% | 20 | 80% | 20 min |
| NWS Norman, OK: severe thunderstorm warnings | 772 | 319 | 59% | 749 | 84% | 26 min |
| NWS Norman, OK: flash flood warnings | 28 | 10 | 64% | 17 | 88% | 81 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 2, 7:33 AM CST | Dense Fog Advisory | OUN | 3 hr |
| Jan 2, 8:46 PM CST | Dense Fog Advisory | OUN | 12 hr |
| Jan 21, 10:43 AM CST | Fire Weather Watch | OUN | 17 hr |
| Jan 22, 3:47 AM CST | Red Flag Warning | OUN | 15 hr |
| Jan 25, 5:08 AM CST | Winter Storm Watch | OUN | 23 hr |
| Jan 26, 4:32 AM CST | Winter Storm Warning | OUN | 34 hr |
| Jan 26, 4:32 AM CST | Winter Weather Advisory | OUN | 43 hr |
| Jan 26, 10:54 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 27, 2:55 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 27, 12:16 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 10, 12:17 PM CST | Mesoscale Discussion | SPC | 118 min |
| Feb 10, 2:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 10, 2:42 PM CST | Tornado Watch | SPC | 7 hr |
| Feb 10, 6:13 PM CST | Mesoscale Discussion | SPC | 92 min |
| Feb 10, 7:14 PM CST | Severe Thunderstorm Warning | OUN | 31 min |
| Feb 20, 4:40 AM CST | Wind Advisory | OUN | 31 hr |
| Mar 9, 2:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Mar 15, 6:41 AM CDT | Dense Fog Advisory | OUN | 3 hr |
| Mar 22, 3:03 PM CDT | Wind Advisory | OUN | 31 hr |
| Mar 23, 11:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Mar 23, 11:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 23, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 27, 6:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Mar 27, 12:27 PM CDT | Severe Thunderstorm Warning | OUN | 25 min |
| Mar 27, 2:56 PM CDT | Winter Weather Advisory | OUN | 26 hr |
| Mar 30, 5:05 PM CDT | Mesoscale Discussion | SPC | 25 min |
| Mar 30, 5:18 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 30, 7:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 9:42 PM CDT | Severe Thunderstorm Warning | OUN | 48 min |
| Mar 30, 10:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 1, 10:52 AM CDT | Wind Advisory | OUN | 8 hr |
| Apr 2, 2:02 AM CDT | Wind Advisory | OUN | 16 hr |
| Apr 5, 3:50 AM CDT | Freeze Warning | OUN | 29 hr |
| Apr 5, 3:50 AM CDT | Freeze Warning | OUN | 30 hr |
| Apr 6, 9:57 AM CDT | Hard Freeze Warning | OUN | 23 hr |
| Apr 7, 8:48 PM CDT | Fire Weather Watch | OUN | 31 hr |
| Apr 8, 3:30 PM CDT | Red Flag Warning | OUN | 31 hr |
| Apr 8, 8:27 PM CDT | Wind Advisory | OUN | 26 hr |
| Apr 9, 12:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 9, 1:44 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 6:29 PM CDT | Frost Advisory | OUN | 14 hr |
| Apr 18, 2:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 18, 3:11 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Apr 18, 5:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 18, 8:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 18, 10:08 PM CDT | Severe Thunderstorm Warning | OUN | 52 min |
| Apr 26, 1:37 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 26, 6:16 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 26, 8:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 12:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 27, 3:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 6:03 PM CDT | Mesoscale Discussion | SPC | 27 min |
| Apr 29, 9:36 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 29, 10:07 AM CDT | Severe Thunderstorm Warning | OUN | 53 min |
| Apr 29, 10:38 AM CDT | Severe Thunderstorm Warning | OUN | 67 min |
| Apr 29, 1:59 PM CDT | River Flood Warning | OUN | 7 hr |
| Apr 30, 3:14 PM CDT | Flash Flood Watch | OUN | 61 hr |
| Apr 30, 5:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Apr 30, 7:54 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 30, 11:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 1, 12:45 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 1, 7:26 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 1, 1:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 1, 3:09 PM CDT | Tornado Watch | SPC | 7 hr |
| May 1, 7:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 1, 9:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 2, 2:58 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 2, 6:50 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 2, 7:21 AM CDT | Severe Thunderstorm Warning | OUN | 54 min |
| May 4, 3:40 PM CDT | Flash Flood Watch | OUN | 39 hr |
| May 8, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 8, 5:52 PM CDT | Tornado Watch | SPC | 11 hr |
| May 9, 12:44 AM CDT | Severe Thunderstorm Warning | OUN | 46 min |
| May 12, 8:07 AM CDT | Severe Thunderstorm Warning | OUN | 53 min |
| May 12, 8:14 AM CDT | Severe Thunderstorm Warning | OUN | 46 min |
| May 12, 8:51 AM CDT | Severe Thunderstorm Warning | OUN | 39 min |
| May 12, 9:10 AM CDT | Mesoscale Discussion | SPC | 65 min |
| May 12, 9:33 AM CDT | Severe Thunderstorm Warning | OUN | 42 min |
| May 12, 10:08 AM CDT | Severe Thunderstorm Warning | OUN | 52 min |
| May 13, 11:40 AM CDT | Flash Flood Watch | OUN | 18 hr |
| May 13, 5:11 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 13, 8:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 13, 9:36 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 13, 9:43 PM CDT | Severe Thunderstorm Warning | OUN | 62 min |
| May 13, 11:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 13, 11:52 PM CDT | Severe Thunderstorm Warning | OUN | 68 min |
| May 15, 7:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 15, 7:48 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 16, 2:10 AM CDT | River Flood Warning | OUN | 8 hr |
| Jun 2, 3:10 PM CDT | Severe Thunderstorm Warning | OUN | 33 min |
| Jun 7, 9:51 PM CDT | High Wind Warning | OUN | 3 hr |
| Jun 10, 2:13 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 10, 4:07 PM CDT | Severe Thunderstorm Warning | OUN | 38 min |
| Jun 10, 4:43 PM CDT | Severe Thunderstorm Warning | OUN | 47 min |
| Jun 12, 7:46 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 12, 2:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 12, 6:50 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 12, 10:08 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 12, 10:45 PM CDT | Severe Thunderstorm Warning | OUN | 60 min |
| Jun 13, 3:25 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 13, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 1:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 30, 1:54 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 3:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 30, 6:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 12:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 6:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 4, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | 61 min |
| Jul 8, 4:11 AM CDT | Heat Advisory | OUN | 9 days |
| Jul 8, 9:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 8, 12:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 8, 1:19 PM CDT | Severe Thunderstorm Warning | OUN | 41 min |
| Jul 8, 1:56 PM CDT | Severe Thunderstorm Warning | OUN | 49 min |
| Jul 16, 4:34 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 16, 4:46 PM CDT | Severe Thunderstorm Warning | OUN | 37 min |
| Jul 16, 11:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 20, 10:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 21, 3:21 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 21, 5:04 AM CDT | Severe Thunderstorm Warning | OUN | 41 min |
| Jul 21, 5:40 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Jul 28, 6:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 29, 8:59 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 20, 2:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 11, 11:15 AM CDT | Flood Watch | OUN | 64 hr |
| Sep 21, 1:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 21, 3:52 PM CDT | Severe Thunderstorm Warning | OUN | 53 min |
| Sep 21, 4:09 PM CDT | Severe Thunderstorm Warning | OUN | 66 min |
| Sep 21, 6:09 PM CDT | Severe Thunderstorm Warning | OUN | 66 min |
| Sep 21, 6:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 21, 6:19 PM CDT | Areal Flood Advisory | OUN | 3 hr |
| Sep 21, 7:00 PM CDT | Flash Flood Warning | OUN | 3 hr |
| Oct 1, 2:28 PM CDT | Severe Thunderstorm Warning | OUN | 77 min |
| Oct 6, 3:15 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 6, 4:36 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 7, 11:34 AM CDT | Flash Flood Watch | OUN | 43 hr |
| Oct 8, 2:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Oct 8, 3:02 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 8, 4:41 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 8, 4:49 PM CDT | Severe Thunderstorm Warning | OUN | 41 min |
| Oct 8, 6:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Oct 8, 8:50 PM CDT | River Flood Warning | OUN | 17 hr |
| Oct 8, 11:37 PM CDT | Areal Flood Warning | OUN | 6 hr |
| Oct 13, 7:49 PM CDT | Dense Fog Advisory | OUN | 8 hr |
| Oct 15, 2:15 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 22, 1:51 AM CDT | River Flood Warning | OUN | 8 hr |
| Oct 29, 1:19 AM CDT | Tornado Watch | SPC | 6 hr |
| Oct 29, 3:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Oct 29, 6:43 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Oct 29, 10:02 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Oct 29, 10:34 AM CDT | Severe Thunderstorm Warning | OUN | 41 min |
| Oct 29, 2:48 PM CDT | River Flood Warning | OUN | 5 hr |
| Nov 16, 12:28 PM CST | Freeze Watch | OUN | 25 hr |
| Nov 17, 1:00 PM CST | Freeze Warning | OUN | 19 hr |
| Nov 23, 12:57 AM CST | Dense Fog Advisory | OUN | 10 hr |
| Nov 24, 10:13 AM CST | Frost Advisory | OUN | 23 hr |
| Nov 25, 11:38 AM CST | Freeze Warning | OUN | 21 hr |
| Dec 2, 3:43 PM CST | Freeze Warning | OUN | 17 hr |
| Dec 7, 11:50 AM CST | Winter Weather Advisory | OUN | 28 hr |
| Dec 23, 2:37 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 23, 4:21 AM CST | Winter Weather Advisory | OUN | 19 hr |
| Dec 23, 10:31 AM CST | Mesoscale Discussion | SPC | 89 min |
| Dec 23, 12:18 PM CST | Mesoscale Discussion | SPC | 57 min |
| Dec 23, 2:47 PM CST | Winter Storm Warning | OUN | 33 hr |
| Dec 24, 9:37 AM CST | Blizzard Warning | OUN | 14 hr |
| Dec 24, 11:23 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 28, 9:26 PM CST | Winter Weather Advisory | OUN | 33 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.