Alert archive / Indiana / Porter County
Weather alerts in Porter County, Indiana, 2023
108 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Porter County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 108
- Warnings
- 20
- Watches
- 12
- Advisories
- 33
- Busiest month
- July27 alerts
- Busiest day
- July 29, 20236 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 2 tornado warnings covering Porter County in 2023 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 4 minutes after it went out.
Porter County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 4 min |
| Severe thunderstorm warnings | 13 | 7 | 46% | 11 | 82% | 17 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 32 | 17 | 47% | 68 | 56% | 11 min |
| NWS Chicago, IL: severe thunderstorm warnings | 164 | 106 | 35% | 544 | 84% | 27 min |
| NWS Chicago, IL: flash flood warnings | 19 | 10 | 47% | 42 | 90% | 75 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 1, 5:16 PM CST | Dense Fog Advisory | LOT | 16 hr |
| Jan 2, 9:04 AM CST | Dense Fog Advisory | LOT | 19 hr |
| Jan 3, 9:35 AM CST | Dense Fog Advisory | LOT | 16 hr |
| Jan 24, 1:57 AM CST | Winter Weather Advisory | LOT | 52 hr |
| Jan 27, 2:28 PM CST | Winter Weather Advisory | LOT | 40 hr |
| Jan 30, 12:03 AM CST | Winter Weather Advisory | LOT | 8 hr |
| Feb 7, 2:42 PM CST | High Wind Watch | LOT | 23 hr |
| Feb 8, 2:01 PM CST | Wind Advisory | LOT | 28 hr |
| Feb 14, 4:03 AM CST | Wind Advisory | LOT | 34 hr |
| Feb 15, 3:35 AM CST | Winter Weather Advisory | LOT | 53 hr |
| Feb 16, 3:18 AM CST | Lakeshore Flood Advisory | LOT | 24 hr |
| Feb 23, 4:19 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Feb 27, 9:14 AM CST | Wind Advisory | LOT | 3 hr |
| Feb 27, 10:38 AM CST | Tornado Warning | LOT | 37 min |
| Mar 2, 2:39 AM CST | Winter Storm Watch | LOT | 18 hr |
| Mar 2, 8:38 PM CST | Winter Storm Warning | LOT | 22 hr |
| Mar 3, 12:44 PM CST | River Flood Watch | LOT | 22 hr |
| Mar 3, 4:25 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 4, 10:24 PM CST | Dense Fog Advisory | LOT | 11 hr |
| Mar 26, 1:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 26, 5:45 PM CDT | Severe Thunderstorm Warning | LOT | 20 min |
| Mar 31, 3:06 AM CDT | Wind Advisory | LOT | 37 hr |
| Mar 31, 2:36 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 31, 4:33 PM CDT | Severe Thunderstorm Warning | LOT | 57 min |
| Mar 31, 6:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 31, 7:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 31, 8:22 PM CDT | Severe Thunderstorm Warning | LOT | 23 min |
| Mar 31, 8:39 PM CDT | Severe Thunderstorm Warning | LOT | 46 min |
| Mar 31, 8:57 PM CDT | Tornado Warning | LOT | 18 min |
| Mar 31, 9:07 PM CDT | Severe Thunderstorm Warning | LOT | 42 min |
| Apr 4, 3:42 PM CDT | Wind Advisory | LOT | 24 hr |
| Apr 5, 3:27 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 5, 3:57 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 5, 5:10 AM CDT | Severe Thunderstorm Warning | LOT | 50 min |
| Apr 5, 6:44 AM CDT | Severe Thunderstorm Warning | LOT | 29 min |
| Apr 5, 8:11 AM CDT | Severe Thunderstorm Warning | LOT | 34 min |
| Apr 11, 3:19 AM CDT | Fire Weather Watch | LOT | 23 hr |
| Apr 12, 2:40 AM CDT | Red Flag Warning | LOT | 16 hr |
| Apr 20, 3:53 AM CDT | Wind Advisory | LOT | 14 hr |
| Apr 22, 1:56 PM CDT | Freeze Watch | LOT | 13 hr |
| Apr 23, 2:56 AM CDT | Freeze Warning | LOT | 29 hr |
| Apr 25, 1:41 PM CDT | Frost Advisory | LOT | 18 hr |
| Apr 26, 2:28 PM CDT | Frost Advisory | LOT | 17 hr |
| May 12, 5:53 PM CDT | Areal Flood Advisory | LOT | 112 min |
| May 24, 4:15 AM CDT | Beach Hazards Statement | LOT | 32 hr |
| Jun 7, 3:40 AM CDT | Beach Hazards Statement | LOT | 24 hr |
| Jun 10, 3:51 AM CDT | Beach Hazards Statement | LOT | 59 hr |
| Jun 14, 2:59 PM CDT | Beach Hazards Statement | LOT | 54 hr |
| Jun 25, 2:27 AM CDT | Special Weather Statement | LOT | 33 min |
| Jun 25, 12:49 PM CDT | Special Weather Statement | LOT | 11 min |
| Jun 26, 10:37 AM CDT | Beach Hazards Statement | LOT | 38 hr |
| Jun 29, 10:34 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 29, 12:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 3:22 PM CDT | Beach Hazards Statement | LOT | 29 hr |
| Jul 5, 7:14 PM CDT | Severe Thunderstorm Warning | LOT | 46 min |
| Jul 11, 2:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 12, 3:53 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 12, 7:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 12, 8:10 PM CDT | Beach Hazards Statement | LOT | 14 hr |
| Jul 14, 9:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 14, 10:50 PM CDT | Severe Thunderstorm Warning | LOT | 40 min |
| Jul 15, 4:04 PM CDT | Special Weather Statement | LOT | 41 min |
| Jul 15, 5:30 PM CDT | Special Weather Statement | LOT | 15 min |
| Jul 20, 3:11 AM CDT | Beach Hazards Statement | LOT | 37 hr |
| Jul 22, 4:21 PM CDT | Special Weather Statement | LOT | 39 min |
| Jul 22, 6:39 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 26, 3:50 AM CDT | Heat Advisory | LOT | 65 hr |
| Jul 26, 11:01 AM CDT | Special Weather Statement | LOT | 44 min |
| Jul 26, 3:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 27, 4:06 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Jul 28, 2:52 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 28, 5:00 AM CDT | Severe Thunderstorm Warning | LOT | 45 min |
| Jul 28, 5:59 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 6:37 AM CDT | Severe Thunderstorm Warning | LOT | 38 min |
| Jul 28, 7:21 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 28, 7:36 PM CDT | Flood Watch | LOT | 5 hr |
| Jul 28, 7:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 28, 11:43 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| Jul 29, 3:25 AM CDT | Beach Hazards Statement | LOT | 16 hr |
| Aug 3, 4:18 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Aug 4, 3:55 AM CDT | Beach Hazards Statement | LOT | 24 hr |
| Aug 5, 3:47 PM CDT | Beach Hazards Statement | LOT | 53 hr |
| Aug 6, 9:58 PM CDT | Beach Hazards Statement | LOT | 30 hr |
| Aug 14, 3:42 AM CDT | Beach Hazards Statement | LOT | 42 hr |
| Aug 14, 11:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 7:48 PM CDT | Beach Hazards Statement | LOT | 43 hr |
| Aug 17, 4:41 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 21, 2:47 AM CDT | Excessive Heat Watch | LOT | 48 hr |
| Aug 22, 2:59 AM CDT | Excessive Heat Warning | LOT | 65 hr |
| Aug 22, 2:17 PM CDT | Heat Advisory | LOT | 13 hr |
| Aug 25, 3:25 AM CDT | Beach Hazards Statement | LOT | 10 hr |
| Aug 25, 2:48 PM CDT | Beach Hazards Statement | LOT | 55 hr |
| Aug 28, 2:58 PM CDT | Beach Hazards Statement | LOT | 67 hr |
| Sep 6, 3:27 PM CDT | Beach Hazards Statement | LOT | 58 hr |
| Sep 11, 3:21 PM CDT | Beach Hazards Statement | LOT | 37 hr |
| Sep 13, 3:47 AM CDT | Special Weather Statement | LOT | 28 min |
| Sep 17, 3:55 AM CDT | Beach Hazards Statement | LOT | 29 hr |
| Oct 9, 2:04 PM CDT | Frost Advisory | LOT | 18 hr |
| Oct 10, 2:18 PM CDT | Frost Advisory | LOT | 18 hr |
| Oct 30, 8:34 AM CDT | Freeze Warning | LOT | 24 hr |
| Oct 31, 2:45 PM CDT | Winter Weather Advisory | LOT | 14 hr |
| Nov 5, 12:33 AM CDT | Dense Fog Advisory | LOT | 10 hr |
| Dec 17, 2:28 AM CST | Wind Advisory | LOT | 40 hr |
| Dec 22, 11:35 PM CST | Dense Fog Advisory | LOT | 12 hr |
| Dec 23, 3:29 PM CST | Dense Fog Advisory | LOT | 21 hr |
| Dec 30, 6:15 PM CST | Winter Weather Advisory | LOT | 17 hr |
| Dec 31, 5:07 PM CST | Winter Weather Advisory | LOT | 9 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 | 13 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 7 |
| Flooding | |
| Flood Watch | 1 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
| Coast and beach | |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 20 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.