Alert archive / Indiana / Dearborn County
Weather alerts in Dearborn County, Indiana, 2009
104 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Dearborn County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 104
- Warnings
- 16
- Watches
- 27
- Advisories
- 24
- Busiest month
- June16 alerts
- Busiest day
- August 4, 20098 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 Dearborn County in 2009 had a tornado report inside them.
Dearborn County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 7 | 3 | 57% | 2 | 100% | 9 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, OH: tornado warnings | 48 | 9 | 81% | 15 | 93% | 16 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 206 | 109 | 47% | 262 | 77% | 20 min |
| NWS Wilmington, OH: flash flood warnings | 25 | 18 | 28% | 49 | 82% | 67 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 4, 9:25 AM EST | Dense Fog Advisory | ILN | 95 min |
| Jan 5, 3:46 PM EST | Winter Weather Advisory | ILN | 38 hr |
| Jan 6, 1:06 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 6, 5:53 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 12, 3:40 PM EST | Winter Weather Advisory | ILN | 18 hr |
| Jan 14, 3:07 AM EST | Wind Chill Advisory | ILN | 3 days |
| Jan 14, 3:07 AM EST | Winter Weather Advisory | ILN | 21 hr |
| Jan 25, 3:36 PM EST | Winter Storm Watch | ILN | 25 hr |
| Jan 26, 5:01 PM EST | Winter Storm Warning | ILN | 47 hr |
| Jan 27, 12:25 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 27, 7:25 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 28, 12:31 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 7:40 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 2, 3:26 PM EST | Winter Weather Advisory | ILN | 35 hr |
| Feb 3, 10:44 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 10, 3:34 AM EST | High Wind Watch | ILN | 12 hr |
| Feb 10, 8:42 AM EST | High Wind Watch | ILN | 46 hr |
| Feb 10, 4:02 PM EST | High Wind Warning | ILN | 36 hr |
| Feb 11, 11:38 AM EST | Tornado Watch | SPC | 6 hr |
| Feb 11, 1:35 PM EST | Mesoscale Discussion | SPC | 85 min |
| Feb 11, 2:44 PM EST | Severe Thunderstorm Warning | ILN | 46 min |
| Mar 8, 2:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 8, 2:52 PM EDT | Tornado Watch | SPC | 5 hr |
| Mar 8, 3:27 PM EDT | Wind Advisory | ILN | 13 hr |
| Mar 8, 5:20 PM EDT | Tornado Warning | ILN | 27 min |
| Mar 8, 5:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Mar 8, 6:06 PM EDT | Severe Thunderstorm Warning | ILN | 39 min |
| Apr 2, 5:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 2, 6:27 PM EDT | Tornado Watch | SPC | 3 hr |
| Apr 2, 8:17 PM EDT | Severe Thunderstorm Warning | ILN | 30 min |
| Apr 5, 12:44 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 5, 3:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 5, 6:10 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Apr 5, 6:37 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 6, 3:20 AM EDT | Freeze Watch | ILN | 32 hr |
| Apr 6, 3:20 AM EDT | Freeze Warning | ILN | 31 hr |
| Apr 7, 10:54 AM EDT | Freeze Warning | ILN | 22 hr |
| Apr 8, 3:54 PM EDT | Frost Advisory | ILN | 17 hr |
| Apr 10, 4:06 AM EDT | Freeze Watch | ILN | 36 hr |
| Apr 11, 9:51 AM EDT | Freeze Warning | ILN | 23 hr |
| Apr 22, 3:44 PM EDT | Frost Advisory | ILN | 17 hr |
| Apr 27, 11:12 AM EDT | Red Flag Warning | ILN | 8 hr |
| May 14, 1:42 AM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 14, 5:37 AM EDT | Mesoscale Discussion | SPC | 53 min |
| May 15, 9:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 11:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 3:27 AM EDT | Frost Advisory | ILN | 29 hr |
| May 28, 1:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 30, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 30, 7:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 30, 9:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 30, 11:37 PM EDT | Mesoscale Discussion | SPC | 23 min |
| May 31, 12:41 AM EDT | Severe Thunderstorm Warning | ILN | 12 min |
| Jun 2, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 2, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 2, 7:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 2, 9:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 2, 9:54 PM EDT | Severe Thunderstorm Warning | ILN | 36 min |
| Jun 10, 8:07 AM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jun 10, 3:48 PM EDT | Flood Watch | ILN | 31 hr |
| Jun 14, 12:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 14, 2:26 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 5:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 19, 6:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 19, 6:59 PM EDT | Tornado Watch | SPC | 8 hr |
| Jun 19, 9:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 20, 12:46 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 2:30 AM EDT | Severe Thunderstorm Warning | ILN | 30 min |
| Jun 26, 2:36 AM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jul 24, 6:12 AM EDT | Dense Fog Advisory | ILN | 3 hr |
| Jul 25, 4:09 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 30, 8:27 PM EDT | Flash Flood Watch | ILN | 12 hr |
| Jul 30, 11:25 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Aug 4, 5:37 AM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 4, 9:24 AM EDT | Mesoscale Discussion | SPC | 36 min |
| Aug 4, 9:41 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 9:47 AM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 4, 10:23 AM EDT | Areal Flood Advisory | ILN | 112 min |
| Aug 4, 10:39 AM EDT | Areal Flood Advisory | ILN | 96 min |
| Aug 4, 11:11 AM EDT | Flash Flood Watch | ILN | 16 hr |
| Aug 4, 5:22 PM EDT | River Flood Advisory | ILN | 36 hr |
| Aug 10, 3:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 10, 5:24 PM EDT | Severe Thunderstorm Warning | ILN | 27 min |
| Aug 19, 6:11 PM EDT | Tornado Watch | SPC | 5 hr |
| Aug 20, 11:42 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 2:57 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 7, 5:25 AM EDT | Areal Flood Advisory | ILN | 3 hr |
| Sep 8, 6:17 AM EDT | Dense Fog Advisory | ILN | 4 hr |
| Sep 24, 4:06 PM EDT | Flash Flood Watch | ILN | 12 hr |
| Sep 26, 6:13 AM EDT | Dense Fog Advisory | ILN | 4 hr |
| Sep 28, 12:21 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Sep 28, 2:25 AM EDT | Mesoscale Discussion | SPC | 65 min |
| Oct 8, 3:20 PM EDT | Flood Watch | ILN | 26 hr |
| Oct 9, 12:36 AM EDT | Areal Flood Advisory | ILN | 4 hr |
| Oct 9, 8:27 AM EDT | Areal Flood Advisory | ILN | 3 hr |
| Oct 16, 4:13 PM EDT | Freeze Watch | ILN | 23 hr |
| Oct 17, 3:22 PM EDT | Freeze Warning | ILN | 18 hr |
| Oct 23, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Dec 7, 3:42 PM EST | High Wind Watch | ILN | 57 hr |
| Dec 7, 5:38 PM EST | High Wind Watch | ILN | 22 hr |
| Dec 8, 3:39 PM EST | High Wind Warning | ILN | 29 hr |
| Dec 9, 3:46 AM EST | Mesoscale Discussion | SPC | 59 min |
| Dec 18, 4:08 AM EST | Winter Weather Advisory | ILN | 35 hr |
| Dec 31, 2:26 PM EST | Winter Weather Advisory | ILN | 16 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 | 7 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 37 |
| Flooding | |
| Flash Flood Watch | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 8 |
| River Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 6 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 3 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 4 |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
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.