Alert archive / Indiana / Jefferson County
Weather alerts in Jefferson County, Indiana, 2020
96 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 96
- Warnings
- 14
- Watches
- 18
- Advisories
- 29
- Busiest month
- April16 alerts
- Busiest day
- April 9, 20205 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 2 | 71% | 1 | 0% | |
| 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 Louisville, KY: tornado warnings | 9 | 0 | 100% | 2 | 0% | |
| NWS Louisville, KY: severe thunderstorm warnings | 177 | 88 | 50% | 258 | 62% | 16 min |
| NWS Louisville, KY: flash flood warnings | 73 | 43 | 41% | 111 | 77% | 61 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 10, 3:46 AM EST | Flash Flood Watch | LMK | 39 hr |
| Jan 10, 3:52 AM EST | Wind Advisory | LMK | 40 hr |
| Jan 11, 9:20 AM EST | Mesoscale Discussion | SPC | 55 min |
| Jan 11, 9:36 AM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Jan 11, 10:57 AM EST | Severe Thunderstorm Warning | LMK | 22 min |
| Jan 15, 12:16 AM EST | Dense Fog Advisory | LMK | 8 hr |
| Feb 6, 2:38 PM EST | Winter Weather Advisory | LMK | 22 hr |
| Feb 7, 3:11 PM EST | Winter Weather Advisory | LMK | 19 hr |
| Feb 11, 11:33 AM EST | Flash Flood Watch | LMK | 43 hr |
| Feb 12, 6:36 PM EST | Areal Flood Advisory | LMK | 3 hr |
| Feb 15, 11:31 AM EST | River Flood Advisory | LMK | 36 hr |
| Feb 28, 3:44 PM EST | Winter Weather Advisory | LMK | 11 hr |
| Mar 19, 4:23 AM EDT | Flash Flood Watch | LMK | 27 hr |
| Mar 19, 4:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Mar 19, 5:06 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 20, 3:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Mar 20, 4:29 AM EDT | Special Weather Statement | LMK | 16 min |
| Mar 20, 4:33 AM EDT | Severe Thunderstorm Warning | LMK | 12 min |
| Mar 28, 9:15 PM EDT | Tornado Watch | SPC | 6 hr |
| Mar 28, 10:59 PM EDT | Special Weather Statement | LMK | 31 min |
| Apr 8, 12:45 PM EDT | Special Weather Statement | LMK | 15 min |
| Apr 8, 6:52 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 8, 7:24 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 8, 8:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Apr 8, 9:58 PM EDT | Severe Thunderstorm Warning | LMK | 32 min |
| Apr 8, 10:04 PM EDT | Severe Thunderstorm Warning | LMK | 26 min |
| Apr 8, 10:28 PM EDT | Severe Thunderstorm Warning | LMK | 47 min |
| Apr 9, 3:14 PM EDT | Freeze Watch | LMK | 12 hr |
| Apr 10, 3:36 AM EDT | Freeze Warning | LMK | 29 hr |
| Apr 12, 3:45 AM EDT | Wind Advisory | LMK | 32 hr |
| Apr 13, 7:50 PM EDT | Freeze Watch | LMK | 8 hr |
| Apr 14, 3:20 AM EDT | Freeze Warning | LMK | 30 hr |
| Apr 15, 10:03 AM EDT | Freeze Warning | LMK | 23 hr |
| Apr 17, 3:27 AM EDT | Frost Advisory | LMK | 30 hr |
| Apr 21, 3:38 AM EDT | Frost Advisory | LMK | 29 hr |
| Apr 29, 7:14 AM EDT | Wind Advisory | LMK | 5 hr |
| May 3, 2:03 PM EDT | Special Weather Statement | LMK | 27 min |
| May 3, 2:30 PM EDT | Special Weather Statement | LMK | 30 min |
| May 3, 3:07 PM EDT | Special Weather Statement | LMK | 23 min |
| May 7, 3:07 AM EDT | Freeze Warning | LMK | 54 hr |
| May 10, 12:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 10, 3:21 PM EDT | Special Weather Statement | LMK | 24 min |
| May 11, 3:08 PM EDT | Frost Advisory | LMK | 17 hr |
| May 17, 3:03 PM EDT | Flash Flood Watch | LMK | 60 hr |
| May 18, 4:15 AM EDT | Special Weather Statement | LMK | 30 min |
| May 23, 3:55 PM EDT | Severe Thunderstorm Warning | LMK | 35 min |
| May 23, 4:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 23, 7:25 PM EDT | Areal Flood Advisory | LMK | 3 hr |
| May 25, 4:56 PM EDT | Severe Thunderstorm Warning | LMK | 23 min |
| Jun 4, 11:11 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 11:54 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 19, 6:36 PM EDT | Special Weather Statement | LMK | 24 min |
| Jun 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 8:24 PM EDT | Flash Flood Watch | LMK | 3 days |
| Jul 8, 4:42 PM EDT | Areal Flood Advisory | LMK | 2 hr |
| Jul 8, 4:52 PM EDT | Flash Flood Warning | LMK | 3 hr |
| Jul 8, 5:30 PM EDT | Special Weather Statement | LMK | 30 min |
| Jul 8, 5:33 PM EDT | Areal Flood Advisory | LMK | 117 min |
| Jul 19, 3:42 AM EDT | Heat Advisory | LMK | 16 hr |
| Jul 22, 12:19 PM EDT | Special Weather Statement | LMK | 41 min |
| Jul 22, 12:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 1:01 PM EDT | Special Weather Statement | LMK | 44 min |
| Jul 27, 1:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 27, 5:03 PM EDT | Special Weather Statement | LMK | 27 min |
| Jul 30, 12:04 PM EDT | Flash Flood Watch | LMK | 40 hr |
| Jul 30, 5:57 PM EDT | Areal Flood Advisory | LMK | 2 hr |
| Aug 10, 10:59 AM EDT | Special Weather Statement | LMK | 16 min |
| Aug 10, 11:03 AM EDT | Areal Flood Advisory | LMK | 2 hr |
| Aug 10, 6:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 10, 7:31 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 8:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 10, 8:58 PM EDT | Special Weather Statement | LMK | 32 min |
| Aug 10, 9:29 PM EDT | Special Weather Statement | LMK | 46 min |
| Aug 18, 12:48 PM EDT | Special Weather Statement | LMK | 27 min |
| Aug 23, 4:49 AM EDT | Dense Fog Advisory | LMK | 5 hr |
| Sep 1, 5:18 AM EDT | Dense Fog Advisory | LMK | 5 hr |
| Sep 2, 3:04 PM EDT | Flash Flood Watch | LMK | 19 hr |
| Sep 26, 3:15 AM EDT | Dense Fog Advisory | LMK | 5 hr |
| Sep 29, 1:47 AM EDT | Dense Fog Advisory | LMK | 7 hr |
| Oct 15, 3:08 AM EDT | Frost Advisory | LMK | 30 hr |
| Oct 16, 3:16 AM EDT | Frost Advisory | LMK | 30 hr |
| Oct 23, 2:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 23, 5:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 28, 3:21 AM EDT | Flood Watch | LMK | 35 hr |
| Oct 29, 5:55 AM EDT | Special Weather Statement | LMK | 110 min |
| Oct 30, 3:29 AM EDT | Frost Advisory | LMK | 31 hr |
| Oct 30, 2:30 PM EDT | Freeze Watch | LMK | 38 hr |
| Nov 1, 3:00 AM EST | Freeze Warning | LMK | 30 hr |
| Nov 14, 3:26 AM EST | Wind Advisory | LMK | 40 hr |
| Nov 18, 3:37 PM EST | Fire Weather Watch | LMK | 12 hr |
| Nov 19, 3:21 AM EST | Red Flag Warning | LMK | 16 hr |
| Nov 25, 6:26 PM EST | Special Weather Statement | LMK | 34 min |
| Nov 29, 3:14 PM EST | Winter Weather Advisory | LMK | 40 hr |
| Dec 16, 3:00 AM EST | Winter Weather Advisory | LMK | 7 hr |
| Dec 23, 4:15 PM EST | Wind Advisory | LMK | 12 hr |
| Dec 27, 8:55 PM EST | Special Weather Statement | LMK | 80 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 | 7 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Areal Flood Advisory | 6 |
| River Flood Advisory | 1 |
| Winter | |
| Winter Weather Advisory | 5 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 3 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
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.